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Zucchiniyellow mosaic virus (ZYMV) is an important non- persistent virus causing high squashproduction losses in Egypt. Aphis gossypii Glover and Myzus persicaeSulazer insects have high efficiency of ZYMV transmission from infected squashplants to healthy ones in Egypt,in advance of their rapid spreading. ZYMV was isolated fromnaturally infected squash plants collected from two locations (Sennoris &Fayoum), at Fayoum governorate. Virus identification was done byserological tests (ELISA) using four different antiserums. Virus wastransmitted to healthy squash plants by mechanical transmission and by using thetwo aphid insects. Fecundity and life span of two aphids andforms (alate and apterous) were studied. ELISA test had relay that the viruswas ZYMV. Typical symptoms of virus were observed by mechanical and aphidinsect's inoculation,yellowmosaic, necrosis, leaf curling, blisters stunting, deformation, reduction inleaf size and knobbed fruits (sever malformation).Fecundity and life span ofAphis gossypii were higher than thoseof Myzus persicae on infectedsquash plantscompared with healthy, respectively.The reducing aphid insects population isrecommended in order to decreasing losses caused by ZYMV infection (as theirability of transmission), in addition of removing the infected plantscontinuously which considered as a source if virus inoculum

egyptian academic journal of biological sciences. g, microbiology

Cotton Aphid (Aphis gossypii Glover) and Green Peach Aphid (Myzus persicae Sulzer) Efficiency of Zucchini Yellow Mosaic Virus Potyvirus (ZYMV) transmission on Squash Plants At Fayoum Governorate.