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1 May 2000 Reproductive Potential of the Parasitic Wasp Microplitis rufiventris (Braconidae; Hymenoptera) Reared in Hosts Treated with Chitin Synthesis Inhibitors
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Abstract

Different larval stages of Microplitis rufiventris Kokujev were exposed to a sublethal dosage (0.4 ppm) of Lefenuron [N-{2, 5-dichloro-4-(1, 1, 2, 3, 3, 3-hexafluoropropoxy)-phenylaminocarbonyl}-2, 6-difluorobenzamide] or Lefenuron (0.2 ppm)/Deltanet (0.2 ppm) [O-n-butyl Ō-(2, 2-dimethyl-2, 3-dihydrobenzofuran-7-yl)-N, N′-dimethyl-N-N′-thiodicarbamate] by feeding treated artificial diets to parasitized Spodoptera littoralis (Boisduval) larvae to evaluate the effects on the reproductive potential of developing parasitoids. Lefenuron treatments caused a reduction in the reproductive ability of either the host insect or its parasitoid. Ovaries of parasitoid females (1 d old) emerging from Lefenuron/Deltanet treatments contained more ova than those from either Lefenuron-treated or control females. Experienced (ovipositing) females from Lefenuron/Deltanet treatments deposited significantly more eggs and contained, at death, more remaining mature oocytes in their calyx and egg reservoirs. The combination of a carbamate insecticide (Deltanet) and chitin-inhibiting growth regulator (Lefenuron) may enhance the reproductive ability of insect parasitoids and may provide a potential means for developing more effective biological control methods against insect pests.

W. E. Khafagi and E. M. Hegazi "Reproductive Potential of the Parasitic Wasp Microplitis rufiventris (Braconidae; Hymenoptera) Reared in Hosts Treated with Chitin Synthesis Inhibitors," Annals of the Entomological Society of America 93(3), 519-524, (1 May 2000). https://doi.org/10.1603/0013-8746(2000)093[0519:RPOTPW]2.0.CO;2
Received: 19 July 1999; Accepted: 1 November 1999; Published: 1 May 2000
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