论文部分内容阅读
一、蚜虫 1.为害特征 保护地主要以瓜蚜(又叫棉蚜)为害为主。寄主主要有黄瓜、南瓜、西葫芦、豆类、茄子、菠菜、葱等蔬菜。以成虫和若虫在叶背和嫩茎上吸食作物汁液。当嫩叶和生长点被害后,由于叶背被刺伤,生长缓慢,叶片卷缩,严重时卷曲成团,生长停止,甚至萎蔫死亡。瓜蚜还排泄蜜露,既阻碍正常生长,又招致病菌寄生,在叶子上造成一层煤污斑,不但产量低,品质也受影响。
First, the aphids 1. Harmful features mainly in the protection of melon aphids (also known as cotton aphid) -based. The main host cucumber, pumpkin, zucchini, beans, eggplant, spinach, green onions and other vegetables. In adults and nymphs on the leaf back and tender stems to drink crop juice. When the young leaves and the growth point were killed, the leaves were stabbed, grew slowly, and the leaves were curled up. When the leaves were severely curled, the clumps formed, the growth stopped, and even the wilts died. Melon aphid also excrete honeydew, both hinder the normal growth, but also lead to parasitic bacteria, causing a layer of coal stain on the leaves, not only low yield, quality is also affected.