Effects of Transplanting Dates and Insecticide Frequency in the Control of Thrips tabaci Lindeman (Thysanoptera:Thripidae) on Onion (Allium cepa L.) in Sokoto, Nigeria

N. D. Ibrahim and A. A. Adesiyun

Journal of Agricultural Science, 2010, vol. 2, issue 2, 239

Abstract: Two factors, transplanting date and insecticide frequency were combined to evaluate their effects in reducingpopulation of thrips and yield of onion. Transplanting was done at monthly interval from November throughMarch, while spraying was done fortnightly, starting from three weeks after transplanting (WAT) to nine WAT(3, 5, 7 and 9) using knapsack sprayer at 18.67g a.i./ha. Results showed that early transplanting done inNovember and December had fewer thrips than the subsequent ones. At 7 WAT, late transplanting made inFebruary had up to 191 thrips/plant and

Date: 2010
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