FIELD EVALUATION OF CERTAIN INSECTICIDES AGAINST WHIT~-FLY, Bemisia tabaci. (HOMOPTERA: ALEYRODIDAE), IN- AL-HASA, SAUDI ARABIA. | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 2, Volume 30, Issue 10, October 2005, Page 6269-6274 PDF (3.97 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2005.239210 | ||||
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| Author | ||||
| A. M. Ajlan | ||||
| Department of Plant Protection College of Agricultural and Food Sciences, King Faisal University, Al-Hasa, Saudi Arabia | ||||
| Abstract | ||||
| Four insecticides were evaluated in the .open field for their efficacy against , whitefly Bemisia tabaci on tomato plants. Two of insecticides (pirtmlphos-rnethyt and chlorpyriphos-ethyl) were ·fror:n organophosphorus compounds, and the other two (cypermethrin and fenv?lerate) from pyrethroids. Two sprays were applied for these insecticides at the recommended rates. Reduction percentages of whitefly populatlonat.different intervals (an hour, 1,3, 7 and 15 days) were estimated. Data . of first spray showed that the means of whitefly were high after an hour of spray then reduced in all insecticide treatments- afterwards except on third day of pirirniphos- methyl treatment. The maximum percent of reduction reached 65.64% in pirimiphos- methyl treatment along 15 days when compared with control. After the second spray, the percent of reduction were 70.42, 62.90, 57.82 and 49.98 in chlorpyrifos-ethyl, pirimiphos-methyl, fenvalerate and cyperrnethrin, respectively along 15 days compared with control.. None of lnsecticide treatments gave complete reduction of whitefly at any time of insecticide treatment | ||||
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