Efficacy of Hygienic Insecticides in Controlling Tobacco Beetles (Lasioderma serricorne)

Tobacco beetles (Lasioderma serricorne Fabricius) are significant pests in tobacco warehouses. To control tobacco beetles in environments such as tobacco warehouses, surrounding areas, and tobacco processing areas, we compared the biological toxicity of seven insecticides: K-Obiol®, Crackdown®, Aqua-K-Othrine®, Temprid®, alphacypermethrin, Actellic, and Demand. We evaluated their median lethal doses (LD50) using the drop method on tobacco beetle larvae, which allowed us to select the most effective insecticide for controlling tobacco beetles in warehouses through ultra-low-volume disinfection. The results showed that (1) the LD50 values for these pesticides were as follows: 3.55 × 10-3 μg for K-Obiol®, 1.47 × 10-2 μg for Crackdown®, 1.66 × 10-2 μg for Aqua-K-Othrine®, 1.51 × 10-2 μg for Temprid®, 5.40 × 10-3 μg for alphacypermethrin, 2.02 × 10-1 μg for Actellic, and 1.64 × 10-3 μg for Demand. Among these insecticides, Demand, K-Obiol®, and alphacypermethirn exhibited the highest toxicity to tobacco beetle larvae, while the toxicity of Actellic to tobacco beetle larvae was the lowest. (2) Demand, K-Obiol®, and alphacypermethrin were selected to control tobacco beetles in warehouses. Their control efficiencies were as follows: 97.54% for Demand, 95.31% for K-Obiol®, and 93.71% for alphacypermethrin.