| laboratory and field studies on the infection of stink bugs, nezara viridula, piezodorus guildinii, and euschistus heros (hemiptera: pentatomidae) with metarhizium anisopliae and beauveria bassiana in brazil | isolates of metarhizium anisopliae (cnpso-ma12) and beauveria bassiana (cnpso-bb56) were tested under field conditions as biological control agents of soybean stink bugs (nezara viridula, piezodorus guildinii, and euschistus heros). kaolin-based powder formulations of m. anisopliae or b. bassiana were applied to soybean plots at a rate of 1.5 x 10(13) conidia per ha. after treatment, field cages (0.25 m2) were placed in plots and stink bug adults were introduced into the cages. mycosis for both ... | 1998 | 9500941 |
| photophase influence on the reproductive diapause, seasonal morphs, and feeding activity of euschistus heros (fabr., 1798) (hemiptera: pentatomidae). | laboratory studies were conducted to verify the influence of photophase on diapause incidence in the neotropical brown stink bug, euschistus heros (fabr., 1798), fed with soybean [glycine max (l.)] merrill pods. nymphs were maintained at three different photophases: 10 h, 12 h, and 14 h, with constant temperature of 25 +/- 1 degree c and relative humidity of 65 +/- 5%. with 14 h, approximately 100% of the adults showed mature reproductive organs; the shoulder (spine) length was significantly gre ... | 2002 | 12489395 |
| effects of double-stranded rna in metarhizium anisopliae var. acridum and paecilomyces fumosoroseus on protease activities, conidia production, and virulence. | isogenic strains (with and without dsrna) of the entomogenous fungi metarhizium anisopliae var. acridum and paecilomyces fumosoroseus were investigated for correlation between the presence of dsrna and the production of cuticle-degrading proteases that play an important role in host parasitism, total secreted protein, and conidia production. similar levels of cuticle-degrading subtilisin-like (pr1) protease were observed for isogenic strains of m. anisopliae var. acridum after growth in medium s ... | 2004 | 15213741 |
| population structure of the brazilian southern green stink bug, nezara viridula. | the southern green stink bug, nezara viridula (l.) (heteroptera: pentatomidae), is a cosmopolitan and economically important pest to several crops. studies on n. viridula migration and population structure have been neglected. we studied geographically distinct brazilian n. viridula populations to assess their variability and to determine gene flow among them. dna from specimens collected on soybean fields were subjected to rapd analysis to determine genetic similarity and population structure p ... | 2005 | 17119605 |
| horizontal transfer and hypovirulence associated with double-stranded rna in beauveria bassiana. | beauveria bassiana strains from different hosts and geographic origins were assayed for the presence of double-stranded rna (dsrna). two of them (15.4%) showed extra bands, with approximately 4.0-3.5 kb and 2-0.7 kb, respectively, after electrophoretic separation of undigested nucleic acids. virus-like particles were approximately 28-30 nm diam. the dsrna was maintained after conidiogenesis (vertical transmission) and was transmitted horizontally by hyphal anastomosis. strains purged of dsrna ob ... | 2006 | 17126542 |
| development of a dry artificial diet for nezara viridula (l.) and euschistus heros (fabricius) (heteroptera: pentatomidae). | artificial diets prepared with wheat germ, soybean protein, dextrosol, potato starch, sucrose, cellulose, soybean or sunflower oil, and vitamin solution for rearing nezara viridula (l.) and euschistus heros (fabricius) were tested under controlled temperature (25 +/- 1 degrees c), rh (60 +/- 10%), and photophase (14h). three diets were tested and compared with the natural diet privet [soybean and peanut seeds and privet ligustrum lucidum ait. fruit (oleaceae)]. all three artificial diets allowed ... | 2006 | 17144126 |
| inter- and intraspecific variation in defensive compounds produced by five neotropical stink bug species (hemiptera: pentatomidae). | the differences in composition of defensive secretions between nymphs, adult males and adult females of chinavia impicticornis (=acrosternum impicticorne), chinavia ubica (=acrosternum ubicum), euschistus heros, dichelops melacanthus and piezodorus guildinii (hemiptera, pentatomidae) were analysed within and between species using compositional log-ratio statistics and canonical variates analysis. differences in composition between nymphs, males and females were found for all species, as well as ... | 2007 | 17574569 |
| aglomerular hemipteran antennal lobes--basic neuroanatomy of a small nose. | we have compared the basic organization of the primary olfactory centre, the antennal lobe (al), in 4 hemipteran species representing the 2 major lineages in this order. the homoptera were represented by the psyllid trioza apicalis and its aphid relatives the grain aphid sitobion avenae fabricius and the rose-grain aphid metopolophium dirhodum walker, whereas the heteroptera were represented by the pentatomid stink bug euschistus heros fabricius. the olfactory systems of psyllids and aphids are ... | 2008 | 18653643 |
| the chemical volatiles (semiochemicals) produced by neotropical stink bugs (hemiptera: pentatomidae). | in recent years the growing concern about environmental changes and how we are using the natural resources have triggered a search for natural products as alternatives to synthetic pesticides. the stink bugs produce a wide variety of chemical compounds (semiochemicals) that show potential to manage these insects. the stink bugs chinavia impicticornis (stål), c. ubica (rolston), dichelops melacanthus (dallas), euschistus heros (f.), piezodorus guildinii (westwood), thyanta perditor (westwood) and ... | 2008 | 19061033 |
| response of the egg parasitoids trissolcus basalis and telenomus podisi to compounds from defensive secretions of stink bugs. | we tested the hypotheses that host-searching behavior of the egg parasitoids telenomus podisi and trissolcus basalis may be differentially influenced by the different blends of volatiles released from the metathoracic glands of adult stink bug host species. we further studied whether such a differential response is due to different individual components of these glands and whether these responses reflect host preferences. y-tube olfactometer bioassays were carried out with crude extracts of meta ... | 2009 | 19127384 |
| insecticide susceptibility of euschistus heros (heteroptera: pentatomidae) in brazil. | euschistus heros (f.) (heteroptera: pentatomidae) is the most prevalent stink bug pest in brazil, and populations can be difficult to manage using organophosphates or endosulfan. because e. heros is difficult to rear in the laboratory, no baseline insecticide susceptibility data have been published. therefore, we conducted dose-mortality studies using field-collected insects, and, using the results from the dose-mortality studies, we surveyed susceptibility to acephate, methamidophos, and endosu ... | 2009 | 19610440 |
| [occurrence and performance of euschistus heros (f.) (heteroptera: pentatomidae) on alternative host plants in rio grande do sul state, brazil]. | the neotropical brown stink bug euschistus heros (f.) can reach high densities in some soybean areas in brazil. besides soybean, it also feeds on other plants, but little is known on the alternative hosts of e. heros in rio grande do sul state. in this study, wild non-cultivated hosts of e. heros at norwest of rio grande do sul state were determined, and the e. heros performance was compared when fed on soybean and on wild hosts. bugs were sought in plants located inside and on the edge of soybe ... | 2009 | 19768262 |
| morphology, distribution and abundance of antennal sensilla in three stink bug species (hemiptera: pentatomidae). | the neotropical stink bugs, euschistus heros, piezodorus guildinii and edessa meditabunda, are important pests of soybean and other crops throughout central america and in south america from northern argentina to brazil. mate finding and host plant location in these species depend largely on their chemical communication, and semiochemicals are important mediators of these behaviors. in this study scanning electron microscopy was used to examine the external morphology, distribution and abundance ... | 2010 | 20096594 |
| [yield of soybean genotypes under infestation of the velvetbean caterpillar and stink bugs]. | three soybean experiments, one for each maturation group (early, semi-early, and medium), were installed in the field in assis, state of são paulo, during the 2003/2004 growing season to evaluate damage caused by anticarsia gemmatalis (hubn.) and by the soybean stink bug complex, euschistus heros (f.), piezodorus guildinii (west.), and nezara viridula (l.). the experiments were installed again in 2004/2005, with the exception of the early cycle group. defoliation caused by a. gemmatalis was eval ... | 2010 | 20498967 |
| study of acrosome formation, interspecific and intraspecific, in the testicular lobes of some pentatomid species. | the objective was to compare the formation of the acrosome in the testicular lobes of the species antiteuchus tripterus f. and platycarenus umbractulatus f., belonging to the subfamily discocephalinae, and euschistus heros f., mormidea quinqueluteum l., oebalus sp. and thyanta perditor f., belonging to the pentatominae (heteroptera: pentatomidae). it was found that, in general, the behavior of periodic acid schiff-positive granules for all of the species analyzed is similar for these species. in ... | 2010 | 20883131 |
| aging and food source effects on mandibular stylets teeth wear of phytophagous stink bug (heteroptera: pentatomidae). | studies were conducted to test the effect of age and food sources on wear of the mandibular teeth of the phytophagous pentatomid, euschistus heros (f.). the total length (µm) of the area bearing the mandibular teeth, the length of the 1st tooth, and the height of the 2nd tooth for teneral (< 1 day-old) adults were significantly greater than that of adults fed on natural [green bean, phaseolus vulgaris pods, raw shelled peanuts, arachis hypogaea, and mature soybean, glycine max seeds] for 30 or 6 ... | 2010 | 21271064 |
| survivorship and egg production of phytophagous pentatomids in laboratory rearing. | survivorship and reproductive performance of the pentatomids euschistus heros (f.) (eh), nezara viridula (l.) (nv), and dichelops melacanthus (dallas) (dm) were tested in the laboratory. a mixture of natural foods (pods of green beans, phaseolus vulgaris, raw shelled peanuts, arachis hypogaea, and fruits of privet, ligustrum lucidum, and 50 pairs/box (25 x 20 x 20 cm) were used, observed for 30 days, and replicated three times. thirty days after emergence, mean female survivorship was 91% (eh), ... | 2011 | 21437480 |
| duration of feeding and superficial and in-depth damage to soybean seed by selected species of stink bugs (heteroptera: pentatomidae). | laboratory studies were conducted to compare duration of feeding and superficial and in-depth damage to soybean (glycine max) seeds by the southern green stink bug, nezara viridula (l.), the neotropical brown stink bug, euschistus heros (f.), the red-banded stink bug, piezodorus guildinii (westwood), and the green-belly stink bug, dichelops melacanthus (dallas). results indicated that feeding time was significantly longer for n. viridula (≈ 133 min) compared to e. heros and d. melacanthus (≈ 70 ... | 2011 | 21584400 |
| transcriptome-based identification of highly similar odorant-binding proteins among neotropical stink bugs and their egg parasitoid. | olfaction plays a fundamental role in insect survival through resource location and intra and interspecific communications. we used rna-seq to analyze transcriptomes for odorant-binding proteins (obps) from major stink bug pest species in brazil, euschistus heros, chinavia ubica, and dichelops melacanthus, and from their egg parasitoid, telenomus podisi. we identified 23 obps in e. heros, 25 obps in c. ubica, 9 obps in d. melacanthus, and 7 obps in t. podisi. the deduced amino acid sequences of ... | 2015 | 26161752 |
| transfer of cry1ac and cry2a proteins from genetically engineered bt cotton to herbivores and predators. | with the cultivation of bt cotton, the produced insecticidal cry proteins are ingested by herbivores and potentially transferred along the food chain to natural enemies, such as predators. in laboratory experiments with bollgard ii cotton, concentrations of cry1ac and cry2ab were measured in lepidoptera larvae (spodoptera littoralis, heliothis virescens), plant bugs (euschistus heros), aphids (aphis gossypii), whiteflies (bemisia tabaci), thrips (thrips tabaci, frankliniella occidentalis), and s ... | 2017 | 28374515 |
| the fungistatic and fungicidal effects of volatiles from metathoracic glands of soybean-attacking stink bugs (heteroptera: pentatomidae) on the entomopathogen beauveria bassiana. | this study was initially designed to evaluate the differential susceptibility of three soybean-attacking pentatomids to the entomopathogenic fungus beauveria bassiana in standardized bioassays. euschistus heros (eh) was shown to be significantly less susceptible than chinavia ubica (cu), whereas dichelops melacanthus (dm) adults were highly susceptible to fungal infections. a deeper look at the mechanisms involved in the possible role of volatiles from metathoracic glands on fungal infections wa ... | 2015 | 26321153 |
| new syntheses of the rice moth and stink bug pheromones by employing (2r, 6s)-7-acetoxy-2,6-dimethyl-1-heptanol as a building block. | (2r, 6r, 10r)-6,10,14-trimethyl-2-pentadecanol, the female pheromone of the rice moth (corcyra cephalonica), methyl (2r, 6r, 10r)-2,6,10-trimethyltridecanoate, the male pheromone of the stink bug (euschistus heros) were synthesized by employing (2r, 6s)-7-acetoxy-2,6-dimethyl-1-heptanol as the common chiral building block. | 2000 | 10993161 |
| use of chromatin remodeling atpases as rnai targets for parental control of western corn rootworm (diabrotica virgifera virgifera) and neotropical brown stink bug (euschistus heros). | rna interference (rnai) is a gene silencing mechanism that is present in animals and plants and is triggered by double stranded rna (dsrna) or small interfering rna (sirna), depending on the organism. in the western corn rootworm (wcr), diabrotica virgifera virgifera leconte (coleoptera: chrysomelidae), rnai can be achieved by feeding rootworms dsrna added to artificial diet or plant tissues transformed to express dsrna. the effect of rnai depends on the targeted gene function and can range from ... | 2016 | 26873291 |
| economic injury level of the neotropical brown stink bug euschistus heros (f.) on cotton plants. | in brazil, the neotropical brown stink bug, euschistus heros (f.) (hemiptera: pentatomidae), commonly disperses from soybeans to cotton fields. the establishment of an economic treatment threshold for this pest on cotton crops is required. infestation levels of adults of e. heros were evaluated on cotton plants at preflowering, early flowering, boll filling, and full maturity by assessing external and internal symptoms of injury on bolls, seed cotton/lint production, and fiber quality parameters ... | 2016 | 27844467 |
| the natural plant stress elicitor cis-jasmone causes cultivar-dependent reduction in growth of the stink bug, euschistus heros and associated changes in flavonoid concentrations in soybean, glycine max. | to test the hypothesis that the plant stress related elicitor cis-jasmone (cj) provides protection in soybean pods against the seed-sucking stink bug pest, euschistus heros, the growth of e. heros on cj-treated pods was investigated using three soybean cultivars differing in insect susceptibility, i.e. brs 134 (susceptible), iac 100 (resistant) and dowling (resistant). e. heros showed reduced weight gain when fed cj-treated dowling, whereas no effect on weight gain was observed when fed other tr ... | 2016 | 27659594 |
| the influence of volatile semiochemicals from stink bug eggs and oviposition-damaged plants on the foraging behaviour of the egg parasitoid telenomus podisi. | during host selection, physical and chemical stimuli provide important cues that modify search behaviours of natural enemies. we evaluated the influence of volatiles released by eggs and egg extracts of the stink bug euschistus heros and by soybean plants treated with the eggs and egg extracts on telenomus podisi foraging behaviour. responses to volatiles were evaluated in y-tube olfactometers after exposure to (1) one egg cluster for 24 h; (2) plants with eggs laid by the stink bug, tested at 2 ... | 2016 | 27296010 |
| sexual success after stress? imidacloprid-induced hormesis in males of the neotropical stink bug euschistus heros. | environmental stress in newly-emerged adult insects can have dramatic consequences on their life traits (e.g., dispersion, survival and reproduction) as adults. for instance, insects sublethally exposed to environmental stressors (e.g., insecticides) can gain fitness benefits as a result of hormesis (i.e., benefits of low doses of compounds that would be toxic at higher doses). here, we experimentally tested whether sublethal exposure to the insecticide imidacloprid would hormetically affect the ... | 2016 | 27284906 |
| toxicity of piper aduncum (piperaceae) essential oil against euschistus heros (f.) (hemiptera: pentatomidae) and non-effect on egg parasitoids. | plant essential oils have been recognized as significant natural resources for insecticides. herein, we have assessed the toxicity of the essential oil of piper aduncum (piperaceae) against euschistus heros (f.) (hemiptera: pentatomidae), a key soybean pest in neotropical america. in addition, we have assessed its effect on the performance of egg parasitoids. the essential oil was obtained from the leaves of p. aduncum via hydrodistillation. subsequently, bioassays of the concentration response ... | 2016 | 27255767 |
| competition between the phytophagous stink bugs euschistus heros and piezodorus guildinii in soybeans. | the abundance and contribution of the neotropical brown stink bug, euschistus heros (f.), and the redbanded stink bug, piezodorus guildinii (west.), to the composition of insect pests of soybean, glycine max (l.), fields have changed both spatially and temporally in neotropical soybean production areas. therefore, we assessed the competitiveness of each species in direct competition experiments following an additive series. we performed mixed (adult) insect infestations in soybean plants and eva ... | 2016 | 27129408 |
| lyophilized artificial diet for rearing the neotropical euschistus heros (hemiptera: pentatomidae). | an artificial diet to mass-rear euschistus heros (f. 1798) (hemiptera: pentatomidae) was developed in the laboratory. biological studies were conducted under controlled conditions of temperature (25 ± 2 °c), rh: 60 ± 10%, and photoperiod of 14:10 (l:d) h. out of 13 diets tested, 2 diets (d9 and d11) were the most suitable. the artificial diets selected had the same composition (green beans, peanuts, sucrose, water, nipagin, and sorbic acid) except for different antimicrobial agents (d11 has tetr ... | 2016 | 27126964 |
| response of soybean genotypes challenged by a stink bug complex (hemiptera: pentatomidae). | pentatomids (stink bugs) are major pests of soybean, glycine max (l.) merril. these pests reach high levels of infestation, cause severe damage to seeds by feeding, are linked to leaf retention, and are difficult to control. host plant resistance is considered to be a valuable tool in integrated pest management and can assist in reducing the damage caused by stink bugs. this research evaluated the resistance of soybean genotypes in brazil to the stink bug complex, the neotropical brown stink bug ... | 2016 | 26662735 |
| identification and functional characterization of esterases in euschistus heros (hemiptera, pentatomidae) and their relationship with thiamethoxam and lambda-cyhalothrin. | the brown stink bug euschistus heros is the most abundant species of the soybean-sucking bugs, and causes large economic losses. applying different chemical groups of organosynthetic insecticides for its control increases the potential for resistance. esterases are a group of enzymes that play a variety of roles in insects, and some of them are related to the metabolism of xenobiotics. the aim of this study was to analyze the esterase isoenzyme system of this species and investigate its response ... | 2015 | 26400338 |
| lethal and sublethal effects of insecticides on the egg parasitoid telenomus podisi (hymenoptera: platygastridae). | insecticide use remains controversial, and subjected to increasing environmental and health concerns, even when recent insecticide groups are considered. neonicotinoids and even bioinsecticides are in the forefront of discussions regarding their nontarget safety. the ubiquitous focus on the lethal effects of insecticides on nontarget species has been expanding to sublethal effects, as sublethal exposure extends for a longer time and affects a broader range of (nontarget) species. here we explore ... | 2016 | 26352754 |
| influence of original host on chemotaxic behaviour and parasitism in telenomus podisi ashmead (hymenoptera: platygastridae). | the egg parasitoid telenomus podisi is a natural control agent of pentatomids, including euschistus heros and tibraca limbativentris, and success of parasitism is dependent upon the parasitoid finding the host. we tested the influence of host egg volatiles and the synthetic sex pheromone (zingiberenol) of t. limbativentris on chemotaxic behaviour of t. podisi, as well as, the impact of the original host on parasitoid selection. we used mated female t. podisi (48 h old) that emerged from the eggs ... | 2014 | 25375218 |
| biochemical aspects of the soybean response to herbivory injury by the brown stink bug euschistus heros (hemiptera: pentatomidae). | plant defense response is an elaborate biochemical process shown to depend on the plant genetic background and on the biological stressor. this work evaluated the soybean biochemical foliar response to brown stink bug herbivory injury through an analysis of redox metabolism and proteomic 2de profiles of susceptible (brs silvania rr) and resistant (iac-100) varieties. the activity of lipoxygenase-3, guaiacol peroxidase, catalase and ascorbate peroxidase was monitored every 24 h up to 96 h. in the ... | 2014 | 25333272 |
| storage of euschistus heros eggs (fabricius) (hemiptera: pentatomidae) in liquid nitrogen for parasitization by telenomus podisi ashmead (hymenoptera: platygastridae). | records in the literature with regard to the influence of freezing of pentatomid eggs on parasitism by microhymenopterans are scarce. in this research, we compared the storage of euschistus heros (fabricius) (hemiptera: pentatomidae) eggs in liquid nitrogen for different periods with the objective of optimizing the multiplication of telenomus podisi ashmead (hymenoptera: platygastridae) in the laboratory. fresh eggs of e. heros were exposed (s3, s6) or not (ns3, ns6) to uv light for 30 min and s ... | 2014 | 27193627 |
| external egg structure of the pentatomidae (hemiptera: heteroptera) and the search for characters with phylogenetic importance. | the chorionic structure of sixteen pentatomid species is described. morphological patterns in different taxonomic levels are discussed. in addition, egg characters useful in cladistic analyses are listed, and some of those characters are tested for congruence with two cladistic analyses previously conducted within pentatomidae. descriptive studies were conducted with banasa induta, capivaccius bufo, catulona pensa, chinavia armigera, chinavia aseada, chinavia brasicola, chinavia runaspis, dichel ... | 2014 | 24871181 |
| identification and expression profile of two putative odorant-binding proteins from the neotropical brown stink bug, euschistus heros (fabricius) (hemiptera: pentatomidae). | this work presents the first identification of putative odorant-binding proteins (obps) from a member of the pentatomidae, i.e. the brown stink bug euschistus heros (fabricius), an important pest of soybean in brazil. antennae from both sexes of e. heros adults (12 days old and unmated) were used to construct a cdna library, from which two transcripts encoding putative e. heros obps (eherobps) were identified. the expression levels of eherobp1 and eherobp2 were found to be higher in male antenna ... | 2014 | 27193516 |
| influence of volatile and nonvolatile secondary metabolites from soybean pods on feeding and on oviposition behavior of euschistus heros (hemiptera: heteroptera: pentatomidae). | identification of chemical compounds extracted from host plants that act as oviposition stimulants for pest insects has gained importance, because of the compounds' potential use in the manipulation of insect behavior in the field. however, for generalist insects, such as phytophagous pentatomids, the chemical basis for the selection of the host is not well-known. insect response can vary according to the soybean genotypes. chemical profile of soybean pods of cultivars 'brs 213', 'brs 267', 'br- ... | 2013 | 24246667 |
| the conservation of number and location of 18s sites indicates the relative stability of rdna in species of pentatomomorpha (heteroptera). | fluorescent in situ hybridization (fish) with rdna probes has been used for comparative cytogenetics studies in different groups of organisms. although heteropterans are a large suborder within hemiptera, studies using rdna are limited to the infraorder cimicomorpha, in which rdna sites are present in the autosomes or sex chromosomes. we isolated and sequenced a conserved 18s rdna region of antiteuchus tripterus (pentatomidae) and used it as a probe against chromosomes of 25 species belonging to ... | 2013 | 24099395 |
| storage of pentatomid eggs in liquid nitrogen and dormancy of trissolcus basalis (wollaston) and telenomus podisi ashmead (hymenoptera: platygastridae) adults as a method of mass production. | the eggs of pentatomid species were evaluated to parasitism by trissolcus basalis (wollaston) and telenomus podisi ashmead after storage in liquid nitrogen. adults which emerged from stored eggs were kept at 18°c for 120 and 180 days to investigate whether adult dormancy could be associated with host egg storage in liquid nitrogen as a method of mass production of these egg parasitoids. eggs of nezara viridula (l.) and acrosternum pengue (rolston) were successfully parasitized by t. basalis, as ... | 2013 | 27023209 |
| feeding activity, salivary amylase activity, and superficial damage to soybean seed by adult edessa meditabunda (f.) and euschistus heros (f.) (hemiptera: pentatomidae). | greenhouse and laboratory studies were conducted to evaluate feeding activity and superficial damage to soybean seed by the brown-winged stink bug, edessa meditabunda (f.), and the neotropical brown stink bug, euschistus heros (f.). soybean plants (cv. brs 282), at r6 stage of development were used. thirty pairs of each species were used individually for 48 h. two daily observations (9:00 am and 3:00 pm) were taken to record the number of bugs (feeding/resting) on plant parts. harvested seeds im ... | 2012 | 23950088 |
| spatial distribution of euschistus heros (f.) (hemiptera: pentatomidae) in soybean. | soybean bugs are major crop pests that cause significant reduction in harvest yield and influence grain quality. the aim of this study was to verify the spatial distribution of euschistus heros (f.) (hemiptera: pentatomidae) in conventional and transgenic soybean cultivars. the experiment was conducted during the 2010-2011 crop season in unesp/fcav, jaboticabal, sp, brazil, in two fields of 10,000-m(2) area that were subdivided into 100 plots (10 m × 10 m). the cultivars sown were m 7908 rr and ... | 2013 | 23949862 |
| comparative biology of euschistus heros (f.) (hemiptera: pentatomidae) feeding on cotton and soybean reproductive structures. | the neotropical brown stink bug, euschistus heros (f.), is a phytophagous pentatomid that causes considerable economic losses in soybean crop, but it has been recently reported using cotton as a new host plant. nymphs and adults of e. heros were raised on six different food sources composed of the reproductive structures of cotton and soybean plants: a standard diet (green-bean pods + raw peanuts + privet fruits), soybean seeds, soybean pods, cotton seeds, cotton bolls, and cotton floral buds. t ... | 2013 | 23949855 |
| tremulatory and abdomen vibration signals enable communication through air in the stink bug euschistus heros. | communication by substrate-borne mechanical signals is widespread among animals but remains one of their least understood communication channels. past studies of vibrational communication in insects have been oriented predominantly to communication during mating, showing that species- and sex-specific vibrational signals enable recognition and localization of potential mates on continuous solid substrates. no special attention has been paid to vibrational signals with less obvious specificity as ... | 2013 | 23460803 |
| semiochemicals from herbivory induced cotton plants enhance the foraging behavior of the cotton boll weevil, anthonomus grandis. | the boll weevil, anthonomus grandis, has been monitored through deployment of traps baited with aggregation pheromone components. however, field studies have shown that the number of insects caught in these traps is significantly reduced during cotton squaring, suggesting that volatiles produced by plants at this phenological stage may be involved in attraction. here, we evaluated the chemical profile of volatile organic compounds (vocs) emitted by undamaged or damaged cotton plants at different ... | 2012 | 23179097 |
| defensive compounds and male-produced sex pheromone of the stink bug, agroecus griseus. | agroecus griseus is a serious corn pest in brazil. contents of the dorsal abdominal glands (dags) in nymphs, and the metathoracic gland (mtg) in adults of this species were characterized and quantified. compounds found were similar to those of other pentatomidae species and included aliphatic hydrocarbons, aldehydes, oxo-alkenals, and esters. however, two compounds were found in the mtg that have not been described previously for this family. mass spectrometry, infrared spectroscopy, and gas chr ... | 2012 | 22914958 |
| an invasive pentatomid pest in argentina: neotropical brown stink bug, euschistus heros (f.) (hemiptera: pentatomidae). | this is the first record on the invasion of the neotropical brown stink bug, euschistus heros (f.) in paraná county (latitude 31º 51' 9.6" s, longitude 60º 32' 11.2" w), entre ríos province, argentina. five adults were intercepted in 2009/2010, one in crop residues and four on soybean fields. the expanding range in the distribution of e. heros in the southern hemisphere is believed to be due to the increased commercial trade among countries, increase in the area cultivated with soybean, and the ... | 2013 | 23939278 |
| volatiles mediating a plant-herbivore-natural enemy interaction in resistant and susceptible soybean cultivars. | several studies have shown that herbivore-induced plant volatiles act directly on herbivores and indirectly on their natural enemies. however, little is known about the effect of herbivore damage on resistant and susceptible plant cultivars and its effect on their natural enemies. thus, the aim of this study was to evaluate the attraction of the herbivorous pentatomid bug euschistus heros and its egg parasitoid telenomus podisi to two resistant and one susceptible soybean cultivars with differen ... | 2011 | 21318397 |
| variable levels of resistance of soybean genotypes on the performance of euschistus heros (hemiptera: pentatomidae). | the neotropical brown stink bug euschistus heros (fabr.) (hemiptera: pentatomidae) is one of the major soybean pests in south america. this species is responsible for high levels of infestation, causes critical damage to seeds, it is associated with leaf retention on plants, and it is extremely difficult to manage. host plant resistance is a notable technique to assist in reducing the stink bug population in soybean crops. the antibiosis resistance of soybean genotypes to e. heros was evaluated ... | 2017 | 29040680 |
| ultrastructural analysis of salivary glands in a phytophagous stink bug revealed the presence of unexpected muscles. | the exceptional abilities of stink bugs (hemiptera: pentatomidae) to colonize a diverse group of plants have been attributed to the feeding behaviors and the functions of the salivary complex of these insects. here, we describe the ultrastructure of the salivary glands of the neotropical brown stink bug, euschistus heros, which is a major component of the pentatomid pest complex on soybeans, glycine max, in the neotropics. our results revealed a salivary gland complex consisting of two lobes (i. ... | 2017 | 28658296 |
| side-effects of pesticides used in irrigated rice areas on telenomus podisi ashmead (hymenoptera: platygastridae). | telenomus podisi ashmead (hymenoptera: platygastridae) is an important agent for the biological control of stink bug eggs in irrigated rice areas and the best strategy for its preservation is the use of selective pesticides. the aim of this study was to know the side-effects of pesticides used in brazilian irrigated rice areas on egg parasitoid t. podisi. we evaluated, under laboratory conditions, 13 insecticides, 11 fungicides, 11 herbicides, and a control (distilled water) in choice and no-cho ... | 2017 | 28439681 |
| host preferences of telenomus podisi (hymenoptera: scelionidae): parasitism on eggs of dichelops melacanthus, euschistus heros, and podisus nigrispinus (hemiptera: pentatomidae). | successful biological control requires detailed knowledge about host preferences of the released parasitoid, because the presence of alternative hosts may affect the control of the target pest. the objective of this work was therefore to evaluate host preferences of telenomus podisi ashmead among the eggs of three stink bug species: dichelops melacanthus dallas, euschistus heros fabricius, and podisus nigrispinus dallas (heteroptera: pentatomidae). three independent experiments were carried out ... | 2017 | 29159796 |