The antifeedant effect of neem seed kernel extract and azadirachtin on nymphs ofEyprepocnemis plorans |
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| Authors: | K R S Ascher M Streloke G H Schmidt J D Warthen |
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| Institution: | 1. FB Biologie, LG Zoologie-Entomologie, Universitat Hannover, D-3000 Hannover 21, FRG
3. Insect Chemical Ecology Laboratory, Plant Sciences Institute, USDA-ARS, Beltsville Agricultural Research Center, 20705, Beltsville, MD, USA
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| Abstract: | Acridids belonging to different species and families exhibit large differences in their response to neem components. In this
context the antifeedant effect of a methanolic neem seed kernel extract (NSKE) and of azadirachtin (AZA) on fourth-instar
nymphs of the acrididEyprepocnemis plorans Charpentier (Saltatoria:Acrididae) was investigated. Nymphs were offered either saccharose-impregnated filter paper disks
or leaves of broad beans, treated with neem components. The amount of substrate consumed was determined by weighing the filter
paper or by measuring the leaf area. On filter paper both NSKE and AZA were highly active down to the 10−4% treatment. In the leaf treatment, however, AZA was definitely more active than NSKE, with 100% deterrence at 10−4% and 10−2%, respectively. The methanolic NSKE was somewhat more active than the commercial preparation ‘Neemark’. |
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| Keywords: | Eyprepocnemis plorans Azadirachta indica methanolic neem seed kernel extract (NSKE) azadirachtin (AZA) ‘ Neemark’ antifeedant different acridid species response to neem |
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