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近几年在湖南省洞庭湖区调查获芦苗期害虫发生程度时,发现几种鳞翅目害虫及软体动物为害状极易混淆。为了提高田间调查效率和质量,笔者对以下几种主要害虫的为害状及为害特点作了仔细观察,现将观察结果简介如下,以供参考。 1.芦苞螟(Chilo luteellns Matsch.)初孵幼虫先啃食卵分布处的叶片主脉,后蛀入心叶为害,使心叶形成排状孔,3—4龄后转移到被害株的中下部或另一株的中下部蛀入;被害处呈红褐色,剖开茎秆,内部有许多血样的内壁组织腐烂液,易与荻蛀茎液蛾害状区别。被害的荻芦极易断秆或倒
In recent years, Dongting Lake area in Hunan Province was surveyed the occurrence of seedling pests, found several Lepidoptera pests and mollusks harming easily confused. In order to improve the efficiency and quality of field investigation, the author made a careful observation of the following pest damage and damage characteristics. The observation results are summarized as follows for reference. 1. The newly hatched larvae of Chilo luteellns Matsch first dug the main veins of the leaves at the egg distribution site, and then elicited the damage of the heart leaves. The heart lobes formed row-shaped holes and transferred to the victim plants after 3-4 instars Middle or lower part of another strain of the middle and lower part of the carcass; victims were reddish-brown, cut open stalks, there are many blood samples of the internal wall tissue decay liquid, easy to distinguish with the stems of moth damage. Diao extremely easily killed stalks or down