Abstract
Beet armyworm (Spodoptera exigua), diamondback moth (Plutella xylostella) and tobacco cutworm (S. litura) are insect pests causing damage in many economically important vegetables in Korea. Bacillus thuringiensis, commonly known as Bt, has been available as an alternative insecticide for many years. Five commercial Bt products and the mixtures evaluate the control efficacy against three kinds of moths. These commercial Bt products had high control efficacy against instar of diamondback moth, but didn`t show high mortality against beet armyworm and tobacco cutworm. Mixtures of Bt products didn`t have synergistic effects to the tested moths. Also application of twice and four times the recommended concentration didn`t improve the control effects against the tested three species of moths.
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