| [chemical composition of volatile oil from chromolaena odorata and its effect on plant, fungi and insect growth]. | the volatile oil from c. odorata had a significant effect on the growth of plants, fungi and insects. the result showed that the seedling growth of five test plants was obviously inhibited, in the order of ryegrass > chinese cabbage > radish > snap been > rice. the inhibitory effect of the oil at its middle concentration (800 mg.l-1) for pyricularia grisea was the strongest, the next was to phytophthora nicotianae, and the weakest was to fusarium axysporum. the inhibitory percentage was 61.40%, ... | 2003 | 12924132 |
| mechanisms relevant to the enhanced virulence of a dihydroxynaphthalene-melanin metabolically engineered entomopathogen. | the entomopathogenic fungus metarhizium anisopliae ma05-169 is a transformant strain that has been metabolically engineered to express dihydroxynaphthalene-melanin biosynthesis genes. in contrast to the wild type strain, the transformant displays a greater resistance to environmental stress and a higher virulence toward target insect host. however, the underlying mechanisms for these characteristics remain unclear; hence experiments were initiated to explore the possible mechanism(s) through phy ... | 2014 | 24662974 |
| differential expression analysis of chemoreception genes in the striped flea beetle phyllotreta striolata using a transcriptomic approach. | olfactory transduction is a process by which olfactory sensory neurons (osns) transform odor information into neuronal electrical signals. this process begins with the binding of odor molecules to receptor proteins on olfactory receptor neuron (orn) dendrites. the major molecular components involved in olfaction include odorant-binding proteins (obps), chemosensory proteins (csps), odorant receptors (ors), gustatory receptors (grs), ionotropic receptors (irs), sensory neuron membrane proteins (s ... | 2016 | 27064483 |
| differences in phyllotreta cruciferae and phyllotreta striolata (coleoptera: chrysomelidae) responses to neonicotinoid seed treatments. | insecticidal seed treatments are used commonly throughout the northern great plains of north america to systemically protect seedlings of canola (brassica napus l. and brassica rapa l.) from attack by the flea beetles phyllotreta cruciferae (goeze) and phyllotreta striolata (f.) (coleoptera: chrysomelidae). here, we investigated differential responses by the two flea beetle species to the neonicotinoid seed treatments thiamethoxam (helix and helix xtra) and clothianidin (prosper 400) in greenhou ... | 2008 | 18330131 |
| alternative management tactics for control of phyllotreta cruciferae and phyllotreta striolata (coleoptera: chrysomelidae) on brassica rapa in massachusetts. | the flea beetles phyllotreta cruciferae (goeze) and phyllotreta striolata (f.) (coleoptera: chrysomelidae: alticinae) are significant pests of crops in the brassicaceae family. from 2001 to 2003, the efficacy of both new and commonly used treatments for the control of flea beetles in brassicas, brassica rapa l., were evaluated in three small plot, randomized complete block design trials. row cover and carbaryl (applied as a weekly foliar spray) were found to be the most consistent at reducing da ... | 2006 | 16813315 |
| psor1, a potential target for rna interference-based pest management. | insect pests cause billions of dollars in agricultural losses, and attempts to kill them have resulted in growing threats from insecticide resistance, dietary pesticide pollution and environmental destruction. new approaches to control refractory insect pests are therefore needed. the host-plant preferences of insect pests rely on olfaction and are mediated via a seven transmembrane-domain odorant receptor (or) family. the present study reports the cloning and characterization of psor1, the firs ... | 2011 | 20854479 |
| [effects of environmental factors on phyllotreta striolata dispersion]. | using marking recapture method, this paper studied the effects of host plants and climatic factors on the dispersion of phyllotreta striolata adults. the results showed that the dispersion of the beetle was impelled by environment elements (tao = 1 ). temperature and wind speed had significantly positive correlations with the dispersion of the beetle (p < 0.05), while high temperature had a negative correlation. wind orientation had a significant effect on the dispersion of the beetle, with the ... | 2005 | 16180758 |
| [chemical components of volatile oil from mikania micrantha and its biological activity on insects]. | the chemical components of volatile oil from mikania micrantha were analyzed by gc/ms. twenty-two compounds were identified, and monoterpenes and sesquiterpenes as well as alcohol and ketone with their derivatives were major components. biological activity of volatile oil on insect was investigated. the results showed that the volatile oil had significant deterrent effect on oviposition of plutella xylostella, phyllotreta striolata and phaedon brassicae at dose of 5-10 microliters.plant-1. they ... | 2003 | 12722447 |
| a new sesquiterpene lactone glucoside and other constituents from inula salsoloides with insecticidal activities on striped flea beetle (phyllotreta striolata fabricius). | a new sesquiterpene, eupatolide 13-o-β-d-glucopyranoside (eupatolide-ii, 1), lactone glucoside, along with 15 known compounds, were isolated from the whole plant of inula salsoloides (asteraceae). dichloromethane extract and compounds 1-11 were used to investigate insecticidal activities against vegetable important pest, striped flea beetle (phyllotreta striolata fabricius). none of the samples show any toxicity under concentration of 500 times, while compound 1 and the extract had toxic effect ... | 2018 | 28562081 |
| the aggregation pheromone of phyllotreta striolata (coleoptera: chrysomelidae) revisited. | aggregations of the striped flea beetle phyllotreta striolata on their crucifer host plants are mediated by volatiles emitted from feeding males. the male-specific sesquiterpene, (6r,7s)-himachala-9,11-diene (compound a), was shown previously to be physiologically and behaviorally active, but compound a was attractive only when combined with unnaturally high doses of the host plant volatile allyl isothiocyanate (aitc) in field trapping experiments. this indicated that our understanding of the ch ... | 2016 | 27518387 |
| novel family of terpene synthases evolved from trans-isoprenyl diphosphate synthases in a flea beetle. | sesquiterpenes play important roles in insect communication, for example as pheromones. however, no sesquiterpene synthases, the enzymes involved in construction of the basic carbon skeleton, have been identified in insects to date. we investigated the biosynthesis of the sesquiterpene (6r,7s)-himachala-9,11-diene in the crucifer flea beetle phyllotreta striolata, a compound previously identified as a male-produced aggregation pheromone in several phyllotreta species. a (6r,7s)-himachala-9,11-di ... | 2016 | 26936952 |
| morphology and distribution of antennal sensilla of female phyllotreta striolata (fabricius) (coleoptera: chrysomelidae). | phyllotreta striolata (fabricius) is an important pest of brassicaceae in southeast asia and north america. using scanning electron microscopy, we observed the external structure, number, and distribution of the antennal sensilla in p. striolata females to discuss the putative function of these sensilla in host location and oviposition behaviors. the antenna of female p. striolata is filiform, composed of a scape, a pedicel, and a flagellum with 9 flagellomeres. five types of sensilla were ident ... | 2016 | 26757062 |
| phyllotreta striolata flea beetles use host plant defense compounds to create their own glucosinolate-myrosinase system. | the ability of a specialized herbivore to overcome the chemical defense of a particular plant taxon not only makes it accessible as a food source but may also provide metabolites to be exploited for communication or chemical defense. phyllotreta flea beetles are adapted to crucifer plants (brassicales) that are defended by the glucosinolate-myrosinase system, the so-called "mustard-oil bomb." tissue damage caused by insect feeding brings glucosinolates into contact with the plant enzyme myrosina ... | 2014 | 24799680 |
| male phyllotreta striolata (f.) produce an aggregation pheromone: identification of male-specific compounds and interaction with host plant volatiles. | the chrysomelid beetle phyllotreta striolata is an important pest of brassicaceae in southeast asia and north america. here, we identified the aggregation pheromone of a population of p. striolata from taiwan, and host plant volatiles that interact with the pheromone. volatiles emitted by feeding male p. striolata attracted males and females in the field. headspace volatile analyses revealed that six sesquiterpenes were emitted specifically by feeding males. only one of these, however, elicited ... | 2011 | 21181241 |
| [evaluation of azadirachtin against striped flea beetle, phyllotreta striolata (f.)]. | based on the idea of life table, the concept and index of insect pests accumulated damage amount were described and the damage degree and its fluctuation were compared. through analyzing the deterrent effect of azadirachtin on the adults of striped flea beetle (sfb), phyllotreta striolata (f.), the results showed that the control mechanism was its strongly deterrent effect. when 0.5 ml.l-1 azadirachtin was applied, 83.75% of the sfb adults was kept away from the host plant. the population trend ... | 2003 | 12974005 |