| a novel interaction between plant-beneficial rhizobacteria and roots: colonization induces corn resistance against the root herbivore diabrotica speciosa. | a number of soil-borne microorganisms, such as mycorrhizal fungi and rhizobacteria, establish mutualistic interactions with plants, which can indirectly affect other organisms. knowledge of the plant-mediated effects of mutualistic microorganisms is limited to aboveground insects, whereas there is little understanding of what role beneficial soil bacteria may play in plant defense against root herbivory. here, we establish that colonization by the beneficial rhizobacterium azospirillum brasilens ... | 2014 | 25405495 |
| weather forecasting by insects: modified sexual behaviour in response to atmospheric pressure changes. | prevailing abiotic conditions may positively or negatively impact insects at both the individual and population levels. for example while moderate rainfall and wind velocity may provide conditions that favour development, as well as movement within and between habitats, high winds and heavy rains can significantly decrease life expectancy. there is some evidence that insects adjust their behaviours associated with flight, mating and foraging in response to changes in barometric pressure. we stud ... | 2013 | 24098362 |
| [feeding preferences of the spider misumenops pallidus (araneae: thomisidae) on potential prey insects from alfalfa crops]. | the spider misumenops pallidus (thomisidae) is commonly found in alfalfa crops. we studied its predatory preferences on potential insect prey, particularly regarding agroecosystems pests. two kinds of tests were done under normal laboratory conditions: simultaneous presentation of prey (n = 215) and alternative prey test (n = 45). the spiders preferred insects that were mobile, small, without defensive glands and with thin exoskeletons. according to the amount of prey consumed, we established fo ... | 2006 | 18494318 |
| sequestration of distasteful compounds by some pharmacophagous insects. | several pharmacophagous insects have been shown to sequester specific kairomonal substances or their derivatives in their body tissues. turnip sawflies,athalia rosae, visit a plant,clerodendron trichototmum (verbenaceae), and feed voraciously on the leaf surface. clerodendrins were characterized as the potent phagostimulants fora. rosae adults. the insect sequesters some of the analogs and becomes extremely bitter on its body surface. some chrysomelid leaf beetles associated with cucurbitacins w ... | 1990 | 24264904 |
| formulations of melia azedarach to control diabrotica speciosa (germar) (coleoptera: chrysomelidae) larvae in corn and plant enhancement. | we evaluated oil and powder formulations of melia azedarach for controlling larvae of diabrotica speciosa (germar) in corn and plant enhancement. five concentrations of each formulation were evaluated and compared to fipronil (negative control) and distilled water (positive control). after treatment, the number of surviving insects (larvae, pupae, and adults), the adult body weight, the sex ratio, and the longevity were recorded, while the height, dry weight of aerial part and roots, and number ... | 2015 | 26013136 |
| landscape diversity influences dispersal and establishment of pest with complex nutritional ecology. | we studied the effects of landscape structure on species with resource nutritional partition between the immature and adult stages by investigating how food quality and spatial structure of a landscape may affect the invasion and colonization of the insect pest, diabrotica speciosa. to this end, we formulated two bidimensional stochastic cellular automata, one for the insect immature stage and the other for the adult stage. the automata are coupled by adult oviposition and emergence. further, ea ... | 2014 | 24859828 |
| a selective insecticidal protein from pseudomonas mosselii for corn rootworm control. | the coleopteran insect western corn rootworm (wcr, diabrotica virgifera virgifera) is an economically important pest in north america and europe. transgenic corn plants producing bacillus thuringiensis (bt) insecticidal proteins have been useful against this devastating pest, but evolution of resistance has reduced their efficacy. here we report the discovery of a novel insecticidal protein, pip-47aa, from an isolate of pseudomonas mosselii. pip-47aa sequence shows no shared motifs, domains or s ... | 2017 | 28796437 |
| characterization of antibiosis to diabrotica speciosa (coleoptera: chrysomelidae) in brazilian maize landraces. | resistance to insect pests can be found in several native, landrace plants and can be an important alternative to conventional control methods. diabrotica speciosa (germar) (coleoptera: chrysomelidae) larvae are important maize (zea mays l.) (cyperales: poaceae) root pests and finding native resistance in landraces would greatly contribute to maize-breeding programs aimed at controlling this pest. this study investigated whether the growth, survival, oviposition rhythm, fecundity, and fertility ... | 2018 | 29340603 |
| eliciting maize defense pathways aboveground attracts belowground biocontrol agents. | plant defense pathways mediate multitrophic interactions above and belowground. understanding the effects of these pathways on pests and natural enemies above and belowground holds great potential for designing effective control strategies. here we investigate the effects of aboveground stimulation of plant defense pathways on the interactions between corn, the aboveground herbivore adult diabrotica speciosa, the belowground herbivore larval d. speciosa, and the subterranean ento-mopathogenic ne ... | 2016 | 27811992 |
| voltinism of diabrotica speciosa (coleoptera: chrysomelidae) in argentina: latitudinal clines and implications for damage anticipation. | diabrotica speciosa (germar) is an important pest in south america. both the adults and the larvae are polyphagous, and its most susceptible host is maize. factors behind the appearance of adults in the field and geographical variations in voltinism are unknown. this hinders the chances of implementing rational control strategies. | 2013 | 23532858 |
| mating behavior of diabrotica speciosa (coleoptera: chrysomelidae). | diabrotica speciosa (germar) is an economically important pest of neotropical cultures and represents a quarantine risk for neartic and paleartic regions. despite its agricultural importance, few studies have been done on mating behavior and chemical communication, which has delayed the development of behavioral techniques for population management, such as the use of pheromone traps. in this study, we determined 1) the age at first mating; 2) diel rhythm of matings; 3) number of matings over 7 ... | 2012 | 22732614 |
| distribution, host range, and climatic constraints on centistes gasseni (hymenoptera: braconidae), a south american parasitoid of cucumber beetles, diabrotica spp. (coleoptera: chrysomelidae). | the genus diabrotica includes a large number of pest species, including some of the most important crop pests of the americas. the parasitoid centistes gasseni shaw is the first braconid to be described parasitizing diabrotica in south america, and high natural infestations are reported. field and experimental observations on the host range, distribution and biology of this parasitoid are described. centistes gasseniwas collected in southern brazil, eastern paraguay and northeastern argentina, i ... | 2003 | 14704103 |
| nuclear changes during spermiogenesis in two chrysomelid beetles. | ultrastructural and cytochemical studies were carried out on sperm nucleus of the beetles, coelomera lanio and diabrotica speciosa. nuclear development involves changes in the shape and in the degree of chromatin condensation, with specific aggregation patterns of dna-histone complex occurring during this process. lamellar and paracrystalline arrangements of the nuclear material were observed in the diabrotica speciosa spermatid and in the coelomera lanio spermatozoon, respectively. ethanolic-ph ... | 1993 | 18621243 |