Azadirachtin: structural requirements for reducing growth and increasing mortality in lepidopterous larvae |
| |
Authors: | M S J Simmonds W M Blaney S V Ley J C Anderson and P L Toogood |
| |
Institution: | (1) Behavioural Entomology Group, The Jodrell Laboratory, Royal Botanic Gardens, TW9 3AB Kew, Richmond, Surrey, UK;(2) Behavioural Entomology Group, Department of Biology, Birkbeck College, WCE 7HX London, UK;(3) Department of Chemistry, Imperial College of Science, Technology and Medicine, SW7 2AY London, UK |
| |
Abstract: | Spodoptera littoralis, Spodoptera frugiperda and Heliothis virescens were exposed to azadirachtin and 23 other related compounds in three bioassays: oral cannulation, haemolymph injection and topical application. Spodoptera littoralis was susceptible to a larger proportion of the compounds than either of the other species. Overall, azadirachtin, 22,23-dihydroazadirachtin and 1-detigloyl-22,23-dihydroazadirachtin were the most active compounds. The nature of the substitutes at C-1 and C-3 of the decalin ring affects the potency of the compounds, as does the addition of substitutes to C-22,23. Generally, larvae were less sensitive to compounds when they were topically applied than when they were cannulated into the gut or injected into the haemolymph.
Résumé
Spodoptera littoralis, S. frugiperda et Heliothis virescens ont été exposés à l'azadirachtine et 23 autres substances voisines dans 3 expériences: canulation orale, injection d'haemolymphe et application topique. S. littoralis est sensible à un plus grand nombre de substances que les 2 autres espèces. De toutes façons, les substances les plus actives ont été l'azadirachtine, la 22,23-dihydroazadirachtine et la 1-détigloyl-22,23-dihydroazadirachtine. La nature des substitutions en C-1 et C-3 de l'anneau décaline modifie la puissance des substances, tout comme les substitutions en C-22,23. D'une façon générale, les chenilles ont été moins sensibles aux applications topiques qu'aux canulations dans le tube digestif ou aux injections dans l'haemolymphe. |
| |
Keywords: | Azadirachtin Spodoptera littoralis Spodoptera frugiperda Heliothis virescens growth disruption oral cannulation abdominal injection topical application |
本文献已被 SpringerLink 等数据库收录! |
|