Studies on chemical control of coconut caterpillar Brassolis sophorae Linnaeus, a major pest of coconut palm
1970
Rai, B.K. | Ramsarup, C. | Jainarain, K. (Ministry of Nat'l Dev. and Agric. (Guyana). Res. Div.)
Based on the results of a study of comparative toxicity of insecticides to the caterpillars of B. sophorae, 5 insecticides which gave more than 90 % kill at 0.01 % concentration were: methomyl, azinphosmethyl, monocrotophos, trichlorfon and endosulfan. Trichlorfon appears to be best suited for spraying of coconut palms in view of its comparatively low cost and greater safety to operators. Monocrotophos, the only systemic insecticide, was selected for injection into the palms for the control of the caterpillar. Spraying with trichlorfon solution at 1 kg a.i. in 11 litres of spray fluid/ha from fixed wing aircraft, gave excellent control of the caterpillar. Similarly, with a tractor-mounted sprayer 1.0-1.5 kg a.i. in 20-30 litres of spray fluid/ha gave excellent control on palms up to 12 m high. Injection with different dosages of monocrotophos, 60 % E.C. indicated that 2.4 to 3.6 gm a.i. or 4 to 6 ml of 60 % monocrotophos E.C. in one hole/palm, killed all B. sophorae in 4 days. Data on other related trials are presented from which injection of 3.6 gm a.i. or 6 ml of 60 % monocrotophos E.C. in one hole per palm (7.6 cm deep made with a 0.95 cm drill bit) is recommended
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