[Chemical control of Helicoverpa armigera Hubner of chickpea in southern Syria]
1991
Samara, F. (Damascus Univ. (Syria). Faculty of Agriculture) | Ftayeh, M.A. | Alhamydi, M. | Al-Soud, A.H.
The insecticides (Deltamethrin, Fenvalerate, Cotton dust, Dimper, Bacillus thuringensis kurstakii, and Diflubenzuron were tested against Helicoverpa armigera Hb. on local chickpea (Winter sowing) in Southern Syria during 1985/86 and 1986/87 seasons, with three different application dates at 10 days intervals. The first application was at larval density (1 larvae/plant). Results showed that Deltamethrin and Fenvalerate were superior to other tested insecticides in both seasons. Using these two insecticides resulted in high percentage of dead larva after 24 hours of application: 93 and 89 for Deltamethrin and 84, and 91 for Fenvalerate for the two season respectively compared with 12 and 5 for control. There were substantial increases in yield: 85 for Deltamethrin and 69 for Fenvalerate during the first application, about 52 and 47 in the second application and 41 for both insecticides in the 3rd application. We suggest that larval density of 1 larvae/ plant can be considered as economic threshold for chemical control of this insect on local chickpea in Southern Syria. However, this needs more detailed study.
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