Effect of five pesticides on greenbug, Schizaphis graminum (Rondani) (Hem., Aphididae)

Subject Areas :

Shahram  Shahrokhi ¹ (Ph.‌D. in Entomology, Islamic Azad University, Miyaneh Branch.)
habiballah  khodabandeh ² (Scientific Board of Islamic Azad University, Miyaneh Branch.)
manuchehr  farbodi ³ (Ph.‌D. in Soil Science, Islamic Azad University, Miyaneh Branch.)

Received: 2009-08-02 Accepted : 2010-02-04 Published : 2010-01-21

Keywords: Susceptibility, Broom corn, Greenbug, Schizaphis graminum, field recommended dose, Pesticide,

Abstract :

Broom corn is cultured in broad areas as one of th most important agricultural crops in  Miyaneh region, Iran. Greenbug, Schizaphis graminum, an injurious cereal aphid, reduces the yield of the crop and so pestichdes Oxydemeton methyl and Thiometon were usually applicated 3-4 times to prevent aphid damage. In order to select effective pesticides for reducing application times, economic yield production and environmental safety, the effect of commen pesticides in broom corn fields (Oxydemeton methyl and Thiometon) was compared with Imidaclopride, Primicarb and Malathion on green bug. Results revealed that Imidaclopride, Primicarb and Oxydemeton methyl were the most effective pesticides on S. graminum. High Relative Potential Reduced Concentration (RPRC)of Imidaclopride, Primicarb and Oxydemeton methyl were duo to their low LC50 values on the aphid population, and indicated that their field recommended doses most probably can kill more than 50 percent of aphid population in the field condition. The highest Relative Potential Reduced Concentration value was observed in Imidaclopride with 22.56. Besides, Iranian formulations of Thiometon and Oxydemeton methyl were less effective than others and systemic pesticides were more effective than Malathion contact pesticid.

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