有些杜鹃在繁花盛开时,往往出现叶片褪绿发白、正面叶肉有苍白花斑、叶背粘满黑色小颗粒状排泄物,继而产生黄色污斑的现象。被害老叶正面逐渐变成和叶螨为害状相似的黄褐色。近距离仔细观察,可发现叶背有许多翅膜透明、身被黑色网状花纹的小虫。上述这些危害症状,正是由这种名为杜鹃冠网蝽的小虫躲在叶背刺吸为害引起的。 Some cuckoo in the blossoming flowers, often appear chlorotic leaves whitish, positive leaf meridian piebald, leaflets sticky black small granular excrement, followed by the phenomenon of yellow stains. Victims of the old leaves gradually become the spider mite and damage similar to the tan. Close observation carefully, can be found in the leaf back many wings transparent membrane, body was black mesh bug. These symptoms of these hazards, it is caused by this kind of insects called rhododendron crown bug bugs stuck in the back of the leaves.