Ascher, K.R.S., FB Biologie, LG Zoologie-Entomologie, Universitat Hannover, D-3000 Hannover 21, Germany
Streloke, M., FB Biologie, LG Zoologie-Entomologie, Universitat Hannover, D-3000 Hannover 21, Germany
Schmidt, G.H., FB Biologie, LG Zoologie-Entomologie, Universitat Hannover, D-3000 Hannover 21, Germany
Warthen, J.D., Insect Chemical Ecology Laboratory, Plant Sciences Institute, USDA-ARS, Beltsville Agricultural Research Center, Beltsville, 20705, MD, United States

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 acridid Eyprepocnemis 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'. © 1989 Springer Science + Business Media B.V.