甘肃省肃南县3种草原蝗虫的发育与虫灾发生规律

通过对甘肃省肃南县草原的小翅雏蝗、狭翅雏蝗和短星翅蝗调查和饲养观察研究,发现小翅雏蝗的种群数量最大,每年发生一代。5月下旬孵化出土,7月下旬开始羽化,8月上旬羽化达到高峰,在3种蝗虫发育历期中最短;短星翅蝗在3种蝗虫中发育历期最长,6月上、中旬开始孵化出土,8月上旬开始羽化成虫,8月中、下旬为羽化高峰期;狭翅雏蝗的发生规律与小翅雏蝗相似,3种蝗虫成虫数量均在10月份急剧下降。

The development and occurrence of 3 grasshopper species in Sunan County,Gansu Province

Chorthippus fallax ,Chorthippus dubius and Calliptamus abbreviates were fed and observed on grassland in Sunan County,Gansu Province.The result showed that Chorthippus fallax has the largest popu-lation and produced one generation in a year and hatched unearth in late May,and adults emerged in late July and eclosion peaked in early August.The growing and developing period of Chorthippus fallax was the shor-test.Calliptamus abbreviates hatched unearth in early and middle June,and adults emerged in early August and eclosion peaked in middle and late August.The growing and developing period of Calliptamus abbreviates was the longest.The growing and developing characteristics of Chorthippus dubius were similar to Calliptamus ab-breviates .The number of 3 grasshopper species decreased sharply in October.