EFFECT OF SOME INSECTICIDES AND SPRINKLING TIMES IN CONTROLLING THE WHEAT LEAF MINER (Syringopais temperatella Led.) (Lepidoptera: Scythridae)

Abstract

It was found that chemical control had an obvious effect in decreasing the number of pest and giving better characteristics for the plant including dry weight especially when sprinkling pesticides more than once at two dates, The three pesticides achieved (Wide 20%, Diazinon 60% and Alphacypermethrine 5%) the highest effectiveness especially when applied in two dates, the first in 12/3/2008 and the second at 2/4/2008, the Diazinon pesticide when sprinkled at both dates stated above, was characterized by achieving the greatest effect until the 7th days after sprinkling with a percentage of 100%, followed by Alphacypermethrine but until the 5th days after sprinkling, while the highest effectiveness of Wide pesticide was shown at the first day of sprinkling at the stated date with a percentage of 98.51% . The effectiveness of pesticides was inversely reflected in the percentage of infested leaves and positively in the (which is an indicator of healthy plant and a measure of yield quantity), it was shown that the sprinkling of the three pesticides when applied for two times at both the two dates has achieved the lowest percentage of infested leaves especially Diazinon by a percentage of 20.52% (infected leaves) in the 7th day after sprinkling, and the highest average of dry weight reached 0.95 mg/20 plant, followed by Alphacypermethrine which achieved the lowest percentage of infested leaves that reached 22.23%, at the tenth day after sprinkling, besides the dry weight reached (0.74 mg/20 plant), and finally Wide pesticide at the tenth day after sprinkling but with a percentage of 48.78%, and dry weight that reached 0.54 mg/20 plant.