In collaboration with Iranian Phytopathological Society

Authors

Abstract

Cotton aphid, Aphis gossypii, and large cotton aphid, Acyrthosiphon gossypii
(Hom.: Aphididae) are the most important aphids of cotton fields in Iran. The large cotton aphid is more important in Khorasan, therefore this research was conducted in Kashmar region for determination of Economic Injury Level of this aphid during 1999-2000. The complete randomized block design with 3 replication was used and treatments included 0, 5, 10 and 15 aphid per leaf under cages measuring 2×2×1 m. For control of the aphids in check treatment, plants were sprayed with Confidor (250cc/h). Sampling has been done from three upper leaves of 5 plants in each plot with 10 days interval. At the end of this study, datas concerning boll weight, %boll opening, yield and fiber length was analyzed with SAS and JMP. Economic injury level of this aphid was calculated using regression equations and Norton formula. Results indicated that EIL for large cotton aphid, Acyrthosiphon gossypii in Kashmar was 6.3-6.9 aphid per 3 upper leaf of stem.
 
 

Keywords

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