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为阐明金沙江流域蝗区西藏飞蝗(Locusta migratoria tibetensis Chen)发生规律,2007年夏季依据不同植物群落中西藏飞蝗年生活史和种群动态数据分析其发生规律。结果表明:西藏飞蝗在金沙江流域一年发生一代,4月中下旬开始孵化,7月上中旬开始羽化为成虫,8月中旬起进入产卵期。在样地1、样地2和样地3内西藏飞蝗以群居型个体为主,前期虫口密度高,到6月下旬至7月上旬逐渐降低;在样地4内虫口密度低,以散居型个体为主。生境对西藏飞蝗生长发育和消长动态有一定的影响。
In order to elucidate the occurrence of Locusta migratoria tibetensis Chen in the Jinsha River watershed area, the occurrence regularity of Locusta migratoria tibetensis Chen was analyzed based on the annual life history and population dynamics of locusts from different plant communities in the summer of 2007. The results showed that migratory locusts of Tibet had one generation a year in the Jinsha River basin, beginning to hatch in the middle and late April, becoming adult in mid-July and beginning to oviposition in mid-August. In sample plot 1, sample plot 2 and sample plot 3, the locust migratory locusts were predominantly individuals, with high population density at the early stage and gradually decreasing from late June to early July. Insect population density was low in plot 4, The main type of individual. Habitat has a certain impact on the growth and development and dynamics of migratory locusts in Tibet.