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Title: EFFECT OF NEEM, UREA AND AMITRAZ ON OVIPOSITON AND IMMATURE DEVELOPMENT OF BEMISIA ARGENTIFOLII (HOMOPTERA: ALEYRODIDAE).

Author
item PRABHAKER, NILIMA - UNIV OF CALIFORNIA
item TOSCANO, NICK - UNIV OF CA, RIVERSIDE CA
item Henneberry, Thomas

Submitted to: Sweetpotato Whitefly Progress Review Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 7/1/1999
Publication Date: 8/1/2001
Citation: N/A

Interpretive Summary:

Technical Abstract: The effect of two formulations of neem seed extract, a crude extract from India and Azatin, a neem-based insecticide, urea and a mixture of neem seed extract + urea, were investigated as oviposition suppressants and larvicides against Bemisia argentifolii Bellows & Perring. Both seed and soil applications to cotton were tested. Pre-treatment of cotton seeds by neem seed extract did not significantly suppress oviposition but it was suppressed when it was applied as a soil treatment. However, both seed and soil applications of neem seed extract produced significant mortality of immatures leading to reduced emergence of adults. Azatin was effective in suppression of oviposition as well as in inducing larval mortality by both methods of application. Treatment of cotton seeds by urea was effective in reducing oviposition but was ineffective in a soil application. Although treatment of seeds or soil by urea was not toxic to immatures by itself, a mixture of neem seed extract + urea was more effective in the suppression of oviposition and immature mortality, thus reducing the numbers of adult whiteflies that emerged.