Abstract
Field studies were conducted experimental field in the college of agriculture Al-Anbar university to evaluate the combined effect of potassium fertilizer and some chemical insecticides against corn stem borer during spring and fall growing season of 2002. The test included for (0, 20, 40, 60) Kg K / hac two insecticides (cruiser used as seed treatment at rate of 1400 ml/ 100 kg seeds and diazinon 60EC as spring of rate of 1.5 ml/ L) and two cultivars of corn (Buhooth 106, IPA 5012). Results can be summarized as follows: IPA 5012 cultivars showed had caused a lowest percentage of infestation. Potassium fertilizer had significant effect on reducing percentage of infestation when used at rate of 60 Kg K.hac-1. The use of insecticide cruiser caused significant reduction infestation. However the better results were optimum of when the combined effect of potassium and cruiser on the cultivars, IPA 5012 the peasbility of using there element in applied management system as corn borer was discussed.
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