Abstract
Abstract This study focused on the promotion of the insecticidal activity of eco-friendly insecticidalmaterials against four major insect pest in the organic Chinese cabbage cultivation area. Among insecticidalmaterials mixture, BT+Matrine+Neem against leaf beetle larva, Phaedon brassicae, showed the highest 94.1%at 0.05% which is the lowest concentration of three treated concentrations. The insecticidal activity ofMatrine, Neem, and BT alone (0.1%, w/v) or the mixtures (0.05%, w/v) against Cabbage worm larva,Artogeria rapae, was investigated by leaf disc spray method. The insecticidal efficacy of the mixtures of twoor three eco-friendly materials was higher than the single treatment of each material with 94.3%, 100% and100%. Control efficacy of 0.3% COY+0.05% (95.3%) against the green peach aphid, Myzus persicae washigher than that of 0.3% COY+0.05% Neem (90.2%) and lasted for more than 21 days after one timetreatment. At 35 days after treatment, the effect of 0.05% BT+0.05% Matrine and 0.05% BT+0.05%Matrine+0.05% Neem treatments against diamondback moth showed very high insecticidal activity with morethan 90% of control value. Therefore, BT, Neem, and Matrine where are properly treated could be effectiveeco-friendly materials for controlling major insect pests in an organic Chinese cabbage field. Key words Organic Chinese cabbage, Insecticidal activity, BT, Neem, Matrine
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