Evaluation of 11 insecticides for controlling the armyworm, Mythimna separata (Walker) (Lepidoptera, Nactuidae) on the rice plant
1986
Basilio, R.P.
Results of the study under laboratory conditions showed that all of the test insecticides were effective as a contact on the larvae and eggs except acephate. The 6th-instar larvae were the most difficult to kill by insecticide application. All of the test insecticides were effective as foliar spray except diazihnon with triazophos as the most toxic having the longest residual toxicity (14 DAT) followed by cypermethrin, monocrotophos, and azinphos ethyl. BPMC + chloropyrifos, diazinon, and methomyl were effective as fumigant against the moth. Under field conditions, all of the test insecticides were effective except diazinon with triazophos and carbofuran as the most toxic having the longest residual toxicity (7 DAT) followed by cypermethrin, monocrotophos, methomyl and azinphos ethyl. The results of the laboratory and field experiments indicate that the Null's hypothesis - - insecticide is not effective on the armyworm - - was generally rejected.
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