Plant Protection Bulletin (Taipei) (2006) 48, 269-280

B.Y. Chiang, C.C. Hung, S.H. Hsiao, J.S. Hung and W.F. Hsiao (2006)
Evaluation of the effect of different imidacloprid application methods on silverleaf whitefly, Bemisia argentifolii Bellows and Perring, on tomato
Plant Protection Bulletin (Taipei) 48 (4), 269-280
Abstract: The aim of this study was to evaluate the effect of imidacloprid 9.6% S (solution) under two different application methods and various dosages on the silverleaf whitefly, Bemesia argentifolii on tomato. The application methods of imidacloprid consisted of spraying tomato plants at the rates of 0.96 , 0.32 , and 0.16 mg ai or soaking bare tomato roots at the rate of 0.16, 0.32, 0.96, 1.92 and 3.84 mg ai. Treated plants were placed in a screen cage, and B. argentifolli adults were released on day 1, 7, 14 and 21. The numbers of adult staying and eggs laid were counted. Results showed that the adult staying of the check was significantly higher than all the treatments. The percent adult staying rate increased as the dosage of imidacloprid solution increased. Twenty-four hours after application, the adult staying rates of plant spraying (0.96 mg ai) and bare root soaking (3.84 mg ai) were the lowest among the treatments. Seven days after application, adult staying rates of bare root soaking (1.92 and 3.84 mg ai) were the lowest. Fourteen to 21 days after application, adult staying rates of bare root soaking (0.96-3.84 mg ai) were the lowest. Result of the study of the impact of various treatments on the oviposition, showed that significantly higher egg numbers were laid on the control and that there was no significant difference among the treatments. There was no significant difference between plant spraying and bare root soaking during day 1-7. For the plant spraying, there were no differences among three dosages tested until day 21 when slight differences were noticed. On day 14-21, the number of eggs laid on plants treated with bare root soaking was lower than that with plant spraying with the exception of 0.16 mg ai treatment.
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Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Bemisia tabaci biotype MEAM1	Tomato (Solanum lycopersicum)	Taiwan