Nepalese Journal of Zoology: central department of zoology

Publication / Nepalese Journal of Zoology

Predatory insects of Adelges tsugae Annand (Homoptera: Adelgidae) at Dhungkharka, Kavrepalanchok, Nepal

Krishna K Sharma, Mr. Indra P Subedi and Mr. Vasanta K Thapa

Predatory insects of Adelges tsugae Annand (Homoptera: Adelgidae) were studied in Dhungkharka, Kavrepalanchok. The study also assessed their seasonal abundance with respect to A. tsugae infestation and their feeding efficacy. Host plant selected for the study was hemlock plant. The predatory insects were collected by sweaping and beating. Two insects viz. Syrphus sp. (Syrphidae) and Coccinella septempunctata L. (Coccinellidae) were recorded as predators. Coccinella septempunctata was found more effective to control A. tsugae. The highest density of predators was recorded during May (8.9/branch) and June (9.2/branch) corresponding to abundance of pests. Result showed positive correlation between predator and pest population (p<0.05). Mean number of the pest consumed by male C. septempunctata (12.67±3.47 SD) was found less than that by female (16.87±4.39 SD). The difference in consumption capacity is statistically significant (p<0.05).

Key words: Hemlock, Coccinella, Syrphus, infestation, pest

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