caa a22 4500 388105682 CHVBK 20180307125336.0 cr unu---uuuuu 161130e199909 xx s 000 0 eng 10.1017/S1742758400019470 doi S1742758400019470 pii (NATIONALLICENCE)cambridge-10.1017/S1742758400019470 Development of the Parasitoid Microplitis rufiventris Reared in Hosts Treated with Lefenuron, a Chitin Synthesis Inhibitor [Elektronische Daten] Eggs and larvae of Microplitis rufiventris Kok. (Braconidae: Hymenoptera) were exposed to two sublethal concentrations (0.2 and 0.4 ppm) of the chitin synthesis inhibitor lefenuron, by feeding treated artificial diet to their hosts, Spodoptera littoralis (Boisd.) (Noctuidae: Lepidoptera) larvae. Each concentration was initiated during the egg stage or different instars of the parasitoid larvae. Between 4.3 and 33.8% of parasitoid larvae in lefenuron-treated hosts showed morphological and developmental abnormalities. The effect of the compound on the developmental rate and sensitivity of the parasitoid larvae varied according to the parasitoids' age at treatment; the egg stage and older parasitoid larvae were more tolerant to the compound than the first instars. In all treated hosts the developmental rate of the parasitoid was lower than that of controls. The lower lefenuron concentration (0.2 ppm) was more effective at disrupting the development of young parasitoid larvae than the higher one. Delayed or latent effects of the compound were evident in non-emergence of parasitoid adults that were exposed to the compound as first instars. Reduced sensitivity of old parasitoid larvae could be compatible with survival of the parasitoid in integrated control programme of S. littoralis. Copyright © ICIPE 1999 Spodoptera littoralis nationallicence Microplitis rufiventris nationallicence lefenuron nationallicence endodevelopmental rate nationallicence Spodoptera littoralis nationallicence Microplitis rufiventris nationallicence lefénuron nationallicence taux de développement interne nationallicence Hegazi E. M. Department of Entomology, Faculty of Agriculture, Alexandria University, Egypt El-Minshawy A. M. Department of Entomology, Faculty of Agriculture, Alexandria University, Egypt Khafagi W. E. Plant Protection Research Institute, Sabahia, Alexandria, Egypt El-Singaby N. Department of Entomology, Faculty of Agriculture, Alexandria University, Egypt International Journal of Tropical Insect Science Cambridge University Press 19/2-3(1999-09), 199-206 1742-7584 19:2-3<199 1999 19 JTI https://doi.org/10.1017/S1742758400019470 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1742758400019470 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hegazi E. M. Department of Entomology, Faculty of Agriculture, Alexandria University, Egypt NATIONALLICENCE 700 1- El-Minshawy A. M. Department of Entomology, Faculty of Agriculture, Alexandria University, Egypt NATIONALLICENCE 700 1- Khafagi W. E. Plant Protection Research Institute, Sabahia, Alexandria, Egypt NATIONALLICENCE 700 1- El-Singaby N. Department of Entomology, Faculty of Agriculture, Alexandria University, Egypt NATIONALLICENCE 773 0- International Journal of Tropical Insect Science Cambridge University Press 19/2-3(1999-09), 199-206 1742-7584 19:2-3<199 1999 19 JTI CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge