Natural enemy species of Myzus persicae and their distribution in Sichuan tobacco planting areas

In order to clarify the resource and dominant categories of natural enemies of aphid in different tobacco planting areas of Sichuan, the natural enemies of aphid were investigated, collected and identified from 2014 to 2015 crop years. The results showed that there were 29 species of natural enemies for Myzus persicae (Sulzer) in total, included 10 families of 6 orders. The dominant species were Aphidius gifuensis Ashmaed, Coccinella septempunctata Linnaeus, Harmonia axyridis (Pallas), Chrysopa pallens (Rambur) and Episyrphus balteatus(De Geer). Aphidius gifuensis Ashmaed was the dominant enemy in all areas. In addition, Coccinella septempunctata Linnaeus, Harmonia axyridis (Pallas), Chrysopa pallens (Rambur) and Episyrphus balteatus (De Geer) were the dominant enemies in Liangshan, Panzhihua, Dazhou and Guangyuan, as did Harmonia axyridis (Pallas) in Luzhou, Yibin and Deyang.