Study of the use of insecticides for controlling diamondback moth (Plutella xylostella L.) in some provinces of Southern Thailand
1994
Permkam, S. | Ngampongsai, A. (Prince of Songkla Univ., Songkhla (Thailand). Faculty of Natural Resources. Dept. of Pest Management)
According to farmer interviews in Songkhla, Phatthalung, Trang, Nakhon Si Thammarat and Yala provinces, serious insect pests damaging cruciferous crops were diamondback moth (DBM), flea beetle and tobacco cutworm. Methyl parathion, methamidophos, cartap, fenvalerate and bacteria (Bacillius thuringiensis), respectively, were commonly used to control these insects. Certain insecticides were tested against the third instar DBM in the laboratory. Abamectin, 500 ppm, shows the best efficacy. Only 0.5+-0.58 larvae survived after 24-hour exposure. The insecticides were also tested in the field. The DBM mortality was not statistically significant different due to a very low infestation of DBM during the period of study.
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