Laboratory study to evaluate the efficiency of some plant powders against cowpea beetle | ||
| Kufa Journal for Agricultural Science | ||
| Article 1, Volume 6, Issue 1, March 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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