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In order to find and develop new botanical pesticides against storage pests, components of the essential oil (EO) from  Zanthoxylum bungeanum  were identified by GC-MS and their insecticidal activity against the stored product pests were studied. The EO was obtained by steam distillation. Results showed that EO was rich in limonene (23.67), linalool (21.76) and linalyl anthranilate (10.87). In contact assays, linalool exhibited strongest toxicity to red flour beetle adult (LD 50  = 17.06 μg/adult) and larvae (LD 50  = 16.42 μg/larvae), and linalool was the most active one against the  Lasioderma serricorne  (LD 50  = 15.36 μg/larvae). Then limonene and linalool showed different levels of fumigant activities against the two insect species. Synergism effect existed in the proportion of contact assays against  Tribolium castaneum  adults, and additive was observed in the proportion of 7:1 against  T. castaneum  larvae. This work provides important information for the development and utilization of  Z. bungeanum  and suggests that the EO of  Z. bungeanum  has the potential to serve as bio-insecticides for controlling pest damage in stored products.

journal of environmental science and health, part b

Acute toxicity of  Zanthoxylum bungeanum  against two stored product insects and synergistic interactions between two major compounds limonene and linalool