Laboratory study to  evaluate the efficiency of some plant powders against cowpea beetle

	Laboratory study to evaluate the efficiency of some plant powders against cowpea beetle
Kufa Journal for Agricultural Science
Article 1, Volume 6, Issue 1, 2014, Pages 105-109
Abstract
This study was conducted to evulate the plant powder efficiency against cowpea beetle. The plants consist of stinkweed , red pepper, black piper, and cloves . The results revealed that cloves powder was the best one in its effect on the insect, it gave a mortality percent of 82.92%, while the stinkweed powder gave less mortality which was 21.1%. It was found that mortality percentage increased when the exposure period increased , it becomes 57.77% after five days, while it was 38.85% after one day. Also the mortality increased with increasing of powder quantity. Five gm/100 gm cowpea seeds led to increase the mortality up to 54.44%, while the less one reached to 46.63% in quantity of 1.25 gm/100 gm seeds. The number of insects also affected by the plant powder, the cloves powder led to kill all insects , while the stinkweed powder led to kill 42.25% of the insects . Also the powder of cloves led to inhibit the first generation in a percent of 100%, while the inhibition caused by stinkweed powder was 50.44%. The study also showed that cloves and black pepper reduced the loss of cowpea seeds weight to 2.47 % and 2.56 % respectively. It was found that the loss of seeds was decreaced when powder quantity increased of the. The less rate of loss 2.84 % was noticed when 5 gm of powder are using but the high rate of loss 3.85 % was found at a quantity of 1.25 gm of powder. On the other hand , the result explained that the cloves powder led to repellency the insect in apercent of 67.77% , while the parentage 31.11% was noticed when the stinkweed powder is used. In addition the powder quantity 5gm led to repellency 48.33% while 41.66% noticed when the quantity decreased to 1.25gm repellency .

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