Study on the Controlling Effect of New Packaging Materials on the Larvae of Three Stored Grain Insects

In order to clarify the controlling effect of different packaging materials on common storage pests, the penetration and survival of 7 kinds of high density polyethylene films with different concentrations of deltamethrin by the larvae of 3 common species of stored grain pests (Tribolium castaneum (Herbst), Tribolium confusum Duval and Lasioderma serricorne (Fabricius)) were investigated after being treated by two penetration methods for different times at 27~29 ℃ and 70%~80% RH. The results showed that all the tested new insect-proof films had certain insect resistance capabilities, which were different based on species of stored grain insects. In addition, the insect resistance capability of the 6 kinds of new films containing chemicals was higher than that of the control films after 9 days of treatment, and the anti-penetration rate of 1% A (HDPE particle containing 5% deltamethrin by mass) film, 3% A film, 1% B (HDPE particle containing 5% deltamethrin and 2% isoethers by mass) film and 3% B film was 100% under two penetration modes. The survival rate of all three species larvae decreased with increasing treatment time. After 9 days of parallel penetration treatment, the survival rate of three species of larvae on 3%B film was significantly lower than that of other films, and the survival rate of L. serricorne larvae reduced to 10% at the lowest. According to the penetration resistance and larvae survival rate of the test insects on the films, 3% B film had the best insect control effectiveness.