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柳树是湖北省平原、丘陵地区四旁及江河护岸林的主要树种,分布广,生长快,耐水湿,适应性强,深受群众喜爱。近十余年,柳瘿蚊发生渐趋严重,不少地方虫株率达到30—50%,严重处可达90%以上。柳瘿蚊以幼虫为害柳树的树皮,引起皮层和边材组织增生,在主干和支干上形成畸形“肿瘤”。经过多年连续为害,肿瘤处膨大延展,可超过正常树干直径的1—2倍,致使扭曲变形,树势衰弱,甚至枯死。1984年9月,我们在天门县堤防管理段所辖的护岸防浪林内,利用40%氧化乐果乳油对柳瘿蚊进行了内吸毒杀试验取得较好的防治效果。一、试验地概况试验地位于汉江北岸,试区面积约10亩,
Willow is a major species in the plains, hilly areas and banks of river banks in Hubei Province. It is widely distributed, grows rapidly, is wet-resistant, and adaptable. It is favored by the masses. In the recent ten years, the occurrence of Willow gall mosquito gradually became serious. In many places, the rate of insect pests reached 30-50% and the serious place reached 90% or more. Willow gall midge larvae damage willow bark, causing cortical and sapwood tissue hyperplasia, the formation of deformities in the trunk and branch of the “tumor.” After years of continuous damage, the tumor at the expansion of the expansion can be more than 1-2 times the normal trunk diameter, resulting in distortion, the tree weak, or even dead. In September 1984, we used the 40% omethoate EC to test the internal control and poisoning killing of Ampelopsis grossedentatus in the bank revetment protected by the embankment management section of Tianmen County. First, the experimental site The experimental site is located in the north bank of the Han River, the test area of about 10 acres,