Efficacy of Neem Seed Kernel Extract on Oviposition Deterrence of <I>Bactrocera dorsalis</I> (Hendel) and <I>Bactrocera correcta</I> (Bezzi) on Guava Plantation
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Abstract
Oriental fruit fly, Bactrocera dorsalis (Hendel) and guava fruit fly, Bactrocera correcta (Bezzi) causes significant damage to the fruit crops. The field efficacy of different neem extracts, concentrations, persistence and photostability of neem extracts on oviposition deterrence were evaluated. Amongst the seven different neem extracts tested at 20% concentration, ethyl acetate, methanol and hexane+ethyl acetate+methanol extracts were most effective. However, the persistence of the neem extract was only one day under field condition. The increase in concentration from 20 to 50% neither provided complete deterrence nor enhanced the persistence of ethyl acetate or methanol neem extract. Moreover, the use of photostabilizer, 8-hydroxyquinoline, and tert-butylhydroquinone although effective, did not enhance the persistence of 20% ethyl acetate neem extract under field condition. The photo degradation of neem extracts remains a substantial impediment to field efficacy.
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