EFFICACY OF SOME SEQUENTIAL CHEMICAL INSECTICIDES FOR CONTROLLING THE COTTON JASSID, EMPOASCA SPP. (HOMOPTERA, CICADELLIDAE) AND LEAF INJURY IN COTTON FIELDS, BENI – SUIF GOVERNORATE, EGYPT

Abstract

Field experiments of sequential chemical insecticides were carried out at Beni- Suef Governorate, Egypt in the two successive cotton growing seasons 2010 and 2011 to control cotton jassid (Empoasica spp) and it's injury in cotton crop. On this study, the Recommend Ministry Program was developed for control cotton bollworms and cotton Jassid insect togther. The 3rd sequential treatment (Pestban 48% E.C. → Cyperco 20% EC → Neomyl 90 % SP → Mosiplan 20 % SP) was the most effective followed by the 2nd sequential treatment (Pestban 48% EC → Cyperco 20% EC → Mosiplan 20 % SP → Imidor 35 % SC ) during 2010 and 2011 seasons, when compared with the (RMP) (Pestban 48% E.C. → Cyperco 20% EC → Sylian 72% EC). The total percentages of reduction were 85.6, 88.2 %) for cotton Jassid and (83.9 , 75.3%) a compared with (67.8 and 53.9 %) for Ministry program respectively. The sequential treatments 1st and 4th (Pestban 48% EC → Cyperco 20% EC → Neomyl 90 % SP → Marshal 20% EC) and (Pestban 48% EC → Cyperco 20% EC → Neomyl 90 % SP ) were the least effective .The seasonal parentages of reduction were (76.6 , 77.7 % ) and ( 75.3 , 72.8 %) in the two seasons as a compared with (67.8 and 53.9 %) for the Ministry program, respectivelyThe efficiency of four sequential treatments rotation program on the jassid injuries (Empoasca spp.) on the cotton leaves compared with the untreated check . The seasonal percentage reduction of jassid leaf injury were ( 73.61 , 64.5 , 60.68 and 35.56 % for 3rd , 2nd , 1st and 4th sequential programs as a compared with 30.38 % for the Ministry program. Concerning the effect of these programs on the actual yield, The average actual yield for the 3rd , 2nd , 1st and 4th programs were 9.21 , 8.39 , 8.06 and 7.48 kentar / fed. as compared with the (RMP) and untreated check , (6.33 and 4.61 kentar / fed.), respectively. On the other hand, the effect of these programs on, fiber length at 2.5 % SL, Uniformity ratio, fiber strength (Pressley index) and fiber fineness (micronaire reading). The 3rd sequential treatment was the most effective when compared with untreated check. The average values were ( 31.75 , 85.78 , 9.38 and 4.45 compared with the untreated check , (31.35 , 83.15 , 8.13 and 3.85 ), respectivel