Carbon dioxide effects on cowpea weevil (Callosobruchus maculatus F.) attacking mungbean seeds
Anon.
Attempt was made to use CO2 for the control of the cowpea weevil (C. maculatus F.), a serious pest of mungbean seeds during storage and shipment during January 1983. The concentrations of CO2 were 10, 20, 30 and 40 % by volume which provided fumigating action to all stages of growth of cowpea weevil confined in the plastic boxes (4x4x2.5 inches). After the first 24 hr, the primary effect of CO2 showed the percent surviving of egg, larva, pupa, and adult in mungbean seeds at 35.9 % (24.4-47.5), 50.0 % (46.0-60.0), 9.4 % (5.0-13.7), 96.0 % (94.0-98.0) and 64.3 % (55.5-75.0) respectively. By these rates, it clearly showed no side-effect to seed germination of mungbean. The following experiments used CO2 only 20 and 40 percent by volume and observation of fumigating action was extended to 3, 5, 7 and 14 days for the adults in mungbean seed only. At the first 3 days, the percent lethality of cowpea weevil treated with 20 and 70 % CO2 were 84.2 % (78.4-90.0) and 92.5 % (85.0-100.0) respectively. Most cowpea weevils were killed when the time of the post-treatment reached 5 days.
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