我县居大巴山南麓,主产马铃薯(洋芋),历年洋芋种植面积在10一21.6万亩之间。洋芋二十八星瓢虫是我县洋芋上的主要害虫,自七十年代以来每年发生面积少则5万余亩,多达11万多亩,损失产量25.5—130万斤。洋芋二十八星瓢虫的成虫和幼虫都危害洋芋,以幼虫食量最大,为害最凶。成虫和幼虫在洋芋叶背啃食叶肉,残留表皮,形成很多平行透明线状纹,严重时食掉全部叶肉,叶片呈网状,洋芋成 I County home Daba Shan south, the main production of potatoes (potato), calendar years of potato planting area of ​​10 to 21.6 hectares. Umbellifera 28 Umbelliferae is my county potato on the main pests, since the seventies every year since the area of ​​?? as little as 5 million acres, up more than 110,000 mu, the output loss of 25.5-130 kg. Adult and larvae of 28-day-old ladybug potato all endanger the potato, with the largest amount of larvae appearing, causing the worst damage. Adult and larvae in the leafy back grasping the leaves of the leaves, leaving the epidermis, the formation of a number of parallel transparent linear pattern, severe eclipse all the leaves, the leaves were reticulate, potato into