SHI , Xueyan

Spirotetramat is a novel tetramic acid-based insecticide, belonging to keto-enol pesticide family, with a novel mode of action; it interferes with lipid biosynthesis. Its insecticide activity against various agricultural pest insects have been demonstrated (e.g. on [i]Myzus persicae[/i], [i]Bemisia tabaci[/i] and [i]Tetranychus urticae[/i])....

Bradysia odoriphaga Yang et Zhang is a destructive insect pest of Chinese chives. To understand the current status of insecticide resistance of B. odoriphaga in China, the sensitivity variation of eight field populations to six commonly used insecticides, including chlorpyrifos, phoxim, imidacloprid, thiamethoxam, clothianidin and...

Quercetin as one of the key plant secondary metabolite flavonol is ubiquitous in terrestrial plants. In this study, the decrease in sensitivity to lambda-cyhalothrin was observed in quercetin-fed Helicoverpa armigera larvae. In order to figure out the mechanisms underlying the decreased sensitivity of H. armigera larvae to lambda-cyhalothrin by...

Aphis gossypii Glover (Hemiptera: Aphididae) is a polyphagous pest worldwide. Neonicotinoid insecticides, such as nitenpyram, are widely used for its control in cotton crops. Sublethal or low exposure to these insecticides can cause contrasting effects on arthropod pest populations. Through laboratory experiments, we assessed the impact of low...

Organophosphate (OPs) insecticides are still widely used in pest control. The hydrolysis of OPs or oxons of organophosphorothionates by organophosphate hydrolases (OP-hydrolases) represents a major detoxification pathway of OPs. In this study, the response of insect OP-hydrolase activity to the allelochemical quercetin and the insecticide...

Quercetin, one of the most abundant dietary flavonoids, is widely present in nature. In this study, the effects of quercetin ingestion on Helicoverpa armigera larvae growth and its sensitivity to lambda-cyhalothrin were assessed. The median lethal concentration (LC50) value of lambda-cyhalothrin to quercetin-fed H. armigera larvae was 2.39-fold...

Cucurbitacin B is a natural triterpene present in plants of Cucurbitaceae family, which are among the host plants for melon aphid, Aphis gossypii. In present study we characterized the effects of two cucurbitacin B concentrations on the biological parameters of adults (F-0) and of juveniles and adults of their progeny (F-1). The results showed...

Competition is a key structuring component of biological communities, which is affected by both biotic and abiotic environmental stressors. Among the latter, anthropic stressors and particularly pesticides are noteworthy due to their intrinsic toxicity and large use in agroecosystems. However this issue has been scarcely documented so far. In...