Insecticidal activity of the root extract of Decalepis hamiltonii against stored-product insect pests and its application in grain protection.

摘要

Root extracts of Decalepis hamiltonii were tested for insecticidal activity against the stored products pests, Rhyzopertha domonica, Sitophilus oryzae, Stigobium pancieum, Tribolium castaneum and Callosobruchus chinensis, in residual and contact toxicity bioassays. A methanolic extract of D. hamiltonii demonstrated an LC50 value of 0.14 mg/cm2 against all test species in a filter paper residual bioassay. The extract was effective as a grain protectant for wheat and green gram (mung beans). Reduction of F1 progeny was observed in treated grain stored for 3-4 months. The extract did not affect germination of the treated grains. Results indicate that methanolic extracts of D. hamiltonii have the potential to control stored product pests and could serve as a natural grain protectant.