Effect of insecticides for controlling corn insect pests on the predaceous earwig, Proreus simulans Stallen
1993
Watchara Chunhawong | Auranuj Kongkarnjana | Somsak Anekaveng (Department of Agriculture, Bangkok (Thailand). Entomology and Zoology Div.)
Test of insecticides for controlling corn insect pests on the predaceous earwig, Proreus simulans Stallen was conducted at National Corn and Sorghum Research Centre, Nakornratsema province during October 1989-January 1990. The percentage mortality of earwig was determined at 10 days after application of insecticides. It was found that carbofuran and turbufos, a carbamate and organophosphate insecticides, provided the highest toxicity level with 78.93 and 66.34 percent mortality of earwigs at 10 days after topical application. The medium toxicity levels were organophosphate insecticides, EPN, EPN+methyl parathion and sulprofos, which provided 51.58, 44.69 and 34.11 percent mortality of earwigs respectively, at 10 days after spray. The insecticides provided the lowest toxicity level were chlorfluazuron, triflumuron (IGR group), cyhalothrin L, alphacypermethrin+PBO (pyrethroid group), cypermethrin+monocrotophos (pyrethroid+organophosphate) and carbosulfan (carbamate) of which mortality percentages were 0, 0.83, 7.99, 5.00, 7.83 and 10.10 respectively at 10 days after spray. It can be concluded that the organophosphate insecticides provided more toxicity to earwigs than the other groups and the topical application method was also showed higher toxicity than spraying method. It is possibly due to the direct contact ability to those insecticides. The effect of insecticides on increasing the earwig population were also investigated at 30 days after application. The result showed that the organophosphate insecticides provided the highest increasing rate of 0.88-1.89 folds while the control plot showed the increasing rate of 2.21 folds.
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