Mortality Effect of some insecticides on a number of natural enemies in corn fields of Moghan region

Subject Areas :

Received: 2013-02-14 Accepted : 2013-05-13 Published : 2014-02-20

Keywords: chemical control, Natural enemies, Ostrinia nubilalis, Bio-insecticide, European corn borer,

Abstract :

Lethal effects of insecticides: pyridalyl, spinosad, indoxacarb, deltamethrin, thiodicarb, Bt (Bitorin), Bt (Belthirul) and chlorpyrifos were evaluated on a number of natural enemies of European corn borer (Ostrinia nubilalis Hubner): ‍Chrysoperla carnea (Stephens), Habrobracon hebetor (Say), Stethorus spp. and Orius spp. The experiment was performed in a Randomized Complete Block Design with 9 treatments and 3 replications in Moghan in 2011. Samplings were done 1 day before and 7 days after treatments via counting the number of alive natural enemies. The means of mortality percentages were compared through Duncan Multiple Range test. The data analyses were done using SAS 9.1. Maximum mortality of Stethorus spp. was observed in thiodicarb during 1st generation of pest and chlorpyrifos during 2nd generation. The least mortality was observed in Iranian Bt. The mortality of ‍C. carnea was the highest in deltamethrin and thiodicarb in 1st and 2nd generations, respectively, while the mortality was the lowest in Bt (Belthirul)and Bt (Bitorin)in 1st and 2nd generations, respectively. The mortality of H. hebetor was maximum in chlorpyrifos in two generations, while it was minimum in Bt (Belthirul) treatment. The maximum mortality of Orius spp. was in deltamethrin and chlorpyrifos during 1st and 2nd generations, respectively. The minimum mortality of Orius spp. was observed in Bt (Bitorin) and Bts in 1st and 2nd generations, respectively.

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