Efficacy of neem-azal S and margosan-O against the bean aphid, Aphis fabae Scop.
1992
Dimetry, N.Z. (Hannover Univ. (Germany). Fachbereich Biologie. Lehrgebiet Zoologie-Entomologie) | Schmidt, G.H.
Margosan-O, a commercial preparation of neem seed kernel extract was tested for its effects as toxicant, deterrent and sterilant against the bean aphid Aphis fabae and compared with the German product Neem-Azal S. Second and 4th nymphal instars of A. fabae, placed on bean plants treated with different concentrations of Margosan-O or Neem-Azal S, were adversely affected and very high percentage of mortality occurred after 96 hours. In a choice test, higher numbers of adults settled and larvi-posited on plants treated with Margosan-O in comparison to the control. Neem-Azal S treated plants showed high deterrence to the adults at high concentrations. The deterrent effect was reflected in a reduced larviposition. Plants treated with different concentrations of either Neem-Azal S or Margosan-O significantly affected the longevity and fecundity of A. fabae. The efficacy of Neem-Azal S is more pronounced than that of Margosan-O
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