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Laboratory bioassays of the acute and antifeedant effects of avermectin b1 and a related analogue on spodoptera exigua huebner



Laboratory bioassays of the acute and antifeedant effects of avermectin b1 and a related analogue on spodoptera exigua huebner



Journal of Agricultural Entomology 4(1): 21-28



In diet-incorporation bioassays, an analogue of avermectin (L656,748) was ca. 1,500 times more active against neonate Spodoptera exigua (Hubner) than avermectin B1 (Abamectin). LC50 values in ng active ingredient/ml diet (with 95% fiducial limits) were 0.480 (0.447-0.515) for the analogue and 755.4 (616.4-897.2) for avermectin B1. In leaf disk bioassays where both third instar larvae and leaf disks were treated, the avermectin analogue proved to be as toxic as a methomyl standard with 24 h post-application. Avermectin B1 was significantly less active. In residue tests using leaf disks, both avermectin analogue and methomyl caused significant levels of mortality for third instar larvae for at least 14 d post-application, by which time avermectin B1 was no longer effective. Although residues of avermectin B1 produced significant antifeedant effects immediately following application, this effect was not evident by 7 d post-treatment. Only residues of the avermectin analogue produced significant reductions in food consumption per larvae after 14 d. Thus, the analogue of avermectin has considerably more potential for use against S. exigua than avermectin B1.

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Accession: 005787527

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