Efficacy of some plants derived oils on cotton aphid Aphis gossypii
2005
Karimian, Zakariya | Moghisi, Qorban
To determine the bioefficacy of cotton seed oil and neem oil to control cotton aphid, Aphis gossypii a trial was conducted during 2002-2003 in Cotton Research Station of Hashemabad (Gorgan) in Golestan province. The design was as Rondomized Complet Block . The treatments were: cotton seed oil 3% , neem oil 2.5 %, cotton seed oil 3% + detergent 1%, cotton seed oil 3% + detergent 1%, detergent 1% alone, pimetrozin 1kg/ha ( chemical insecticide) and check( without any aphid control),4 replications were considered for the expriment. In 2002 samplings were done 1, 3, 5, 7 and 10 days after treatments with selecting 10 plants randomly from each plots and counting the number of aphids on leaves of 3, 5 and 7 from top . The check was used only for correcting of mortality in other treatments. The results indicated that the efficacy 0f cotton seed oil, neem oil, pimetrozin and detergent were 22.85-47.75 ,18.48-47.22 ,21.75- 67.65 and 21.10-51.25 percent respectively . The result of this year is not reliable because a drastically reduction on aphid number was observed in check after treatments due to the repplency effect of oils from neighboring plots. In 2003 an improvement was taken place in the trial, so in addition to samplings after treatment a sampling was done one day before treatment and the rate of mortality of A.gossypii determined by comparison of aphids number before and after treatment. The results of this year showed that, cotton seed oil 3%, neem oil 2.5 %, pimetrozin 1 kg/ha and detergent 1% had efficacy as 80.05-95.02, 75.43-92.67, 70.75-93.32 and 77.17-90.67 percent respectively. This result is recommendable. Overall it is concluded that if there is not any limiting factor for providing botanical oils neem or cotton seed oils could be implemented in Integrated Pest Management (IPM) of insect pests including A.gossypii.
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