אסיף מאגר המחקר החקלאי

Effects of piperonyl butoxide on Bemisia tabaci Genn. (Homoptera: Aleyrodidae): Mortality, development, parasitism and predation in Israeli cotton fields

Year:

1998

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Volume :

17

Co-Authors:

Devine, G.J., Dept. of Biol./Ecological Chemistry, IACR-Rothamsted, Harpenden, Herts AL5 2JQ, United Kingdom, Department of Zoology, Aberdeen University, Tillydrone Avenue, Aberdeen AB24 2TZ, United Kingdom
Denholm, I., Dept. of Biol./Ecological Chemistry, IACR-Rothamsted, Harpenden, Herts AL5 2JQ, United Kingdom

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Abstract:

In field trials in Israel, piperonyl butoxide (PB) alone, at concentrations of 2000 and 5000 ppm exerted good control over nymphal Bemisia tabaci populations on cotton. Weekly doses of these concentrations exerted greater control than a recommended oil and were as effective as the standard single application of buprofezin. Cypermethrin caused marked resurgence within the plots, probably as a consequence of its detrimental effects on natural enemies. Neither PB, buprofezin nor the oil reduced the incidence of natural enemies. Treatment with 2000 or 5000 ppm PB resulted in a shift in age structure toward a greater proportion of young instars than in other treatments. There was some evidence that these effects facilitated a greater level of parasitism in PB-treated plots.

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