利用田边闲置沟渠及浅水湖汊种植菱角,已成为湖区农民致富的又一个好门径,既可增加收入,又可减少水稻及麦类病虫害的越冬场所,菱角茎叶还是沤肥的好材料。但在菱角栽植中有一种叶部害虫——菱萤叶甲,一般造成受害面积常达50%左右,菱叶被害后,产量大减,甚至失收,必须加强防治。危害症状菱萤叶甲是危害菱叶的主要害虫,发生普遍,危害性大。它以成虫、幼虫群集啃食危害叶片,轻则造 The use of idle ditches along Tanabe and shallow water lakes to plant water chestnuts has become another good way for farmers in the Lake Area to get rich, which not only increases their income but also reduces the overwintering places of rice and wheat diseases and insect pests. However, in the water chestnut planting there is a foliar pest - Polyporus leaf, usually causing the affected area often up to 50%, after the leaves were killed, the production greatly reduced, or even lost, we must strengthen prevention and control. Harmful symptoms Ryukiko leaf A is the main insect pests endangering the leaves, the occurrence of widespread, dangerous. It is adults, larvae gnawing the risk of attacking the cluster, ranging from made