云南高原牧区草场主要危害性蝗虫

The Main Pest Grasshoppers in Pastoral Area and Meadow of Yunnan Plateau.

滇西北海拔 2 5 0 0～ 360 0m的高原牧区草场主要危害性蝗虫有 7种 ,其中中华拟裸蝗及高山雏蝗不仅分布普遍 ,而且发生数量较大 ;重要种中华拟裸蝗具有多样化体色变异现象 ,该种一年发生一代 ,8～ 10月份成虫危害甚为严重。针对当地牧区危害性蝗虫多为短翅或小翅类群、迁扩能力有限的特点 ,可选择性地在成虫交尾产卵期、若蝻期于种群密度较大地段围栏禁牧 ,以药剂防治。

The main 7 species of pest grasshoppers distributed in pastoral area and meadow of Yunnan plateau with elevation of 2500～3600 metres were reported. The grasshopper Conophymacris chinensis Will. and some species of Chorthippus lived in alpine meadow not only spreaded everywhere but also shown a large of number. The important species Conophymacris chinensis Will. completed one generation in a year. Herbages were seriously haumed by the imagines, with different colours on body and their hind tibiae, specially in August, September and October. As the majority of 7 species grasshoppers were with short or minor tegmina, their migration was limited. Therefore, those pests can be controlled by insecticides after stopping grazing when the density of the pests population was great during the coition, oviposition, and nymph period.