Chemical control of soybean stem fly, Melanagromyza phaseoli (Tryon)

Chemical control of soybean stem fly, Melanagromyza phaseoli (Tryon)

1973

REP.SB-0896

Soybean stem fly, Melanagromyza phaseoli damages from 15.83 to 47.50% plants in rabi and up to 96.00% plants in kharif. The results of soil treatment with nine insecticides in the rabi indicated that BHC 10% dust at the rate of 2.5 kg/ha gave the lowest percentages of damaged plants in comparison to control. Phorate 10% gr (2.0 kg/ha), dieldrin 2.5% dust (2.5 kg/ha) and dimethoate 5% granules (1.00 kg/ha) were not significantly different from BHC dust. Phorate gave the highest yield which was 12.0% higher than that of control (untreated). Trichlorophon, heptachlor and BHC were next best in giving higher yield. Among the nine foliar insecticides sprayed seven times during growth period, nuvacron 40% e.c. (0.04% concentration), dimethoate 30% e.c. (0.03%) and endosulfan 35% e.c. (0.05%) gave completely fly free plans and were not significantly superior to methyl demeton. The yield of the treatments was about 20.0% higher than control. Sevin produced phytotoxicity both as soil and foliar treatment, but yield was better than control in spray treatment of sevin. [AS]

v.7(7):31-32, PESTICIDES

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