Abstract
The impact of two chitin synthesis inhibitors, chlorfluazuron and triflumuron against the black cutworm, Agrotis ipsilon (Hufn.) was studied. Feeding technique was adopted. Different effects of these two chitin synthesis inhibitors on the 4 th instar larvae were investigated. Effect on biological aspects, larval duration, larval weight, percentage of pupation, pupal duration, pupal weight, percentage of adult emergence, adult longivity, total oviposition period, number of eggs per female, egg hatchability and sterility percentage were studied. Effect of both compounds on total proteins and glycogen levels was also investigated.
Highlights
The black cutworm, Agrotis ipsilon (Lepidoptera: Noctuidae) is a serious pest of corn and several agricultural crops in Egypt and many other countries of the world
The aim of this study is to investigate the effect of some chitin synthesis inhibitors (CSI) on different life aspects i.e toxicity, biology and biochemistry of the black cutworm, Agrotis ipsilin as a step towards a better understanding of the nature of their action aiming at extending
Treatment of the lack cutworm, Agrotis ipsilon larvae with subleathal doses of chlorfluazuron and triflumuron exerted their action as larval death but they caused an extended effect which was observed as pupal death, failure of emergence and even some adult death or malformations in cuticle, wings and appendages
Summary
The black cutworm, Agrotis ipsilon (Lepidoptera: Noctuidae) is a serious pest of corn and several agricultural crops in Egypt and many other countries of the world This noctuid is almost polyphagous that attacks a large number of vegetable crops (Hill, 1983). Insect growth regulators and chitin synthesis inhibitors (CSI) in particular have received wide attention in insect pest control strategies because of their unique action in interfering with chitin synthesis which confers a remarkable action specificity with very low mammalian toxicity, and the lack of cross resistance between these compounds (Benzoylphenyl Urea compounds, BPU) and conventional insecticides These compounds are effective against lepidopterous immature insect stages, with relatively slow but strong action (Fahmy and Miyata, 1992 and Sammour et al, 2008). The effect of these candidate compounds has not yet been fully investigated in many important insect pests
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