西藏飞蝗的生物学特性

西藏飞蝗Locusta.migratoria tibetensis Chen在四川甘孜州1年发生1代,某些地方(乡城县)1年发生不完整的2代,即以卵越冬,翌年3月下旬开始孵化出土,4月中、下旬为孵化盛期,1~3龄始盛期为4月中旬~5月中旬,高峰期为5月下旬,7月上旬初始羽化,7月下旬~8月上旬为羽化盛期,8月上旬始见产卵,8月下旬~9月上旬为产卵盛期,第1代成虫较早产下的卵块在条件适宜的情况下可于当年9月上旬孵化出土,但孵化出的蝗蝻不能越冬。该虫卵、全蝻期及全世代的发育起点温度分别为14.2,16.1,14.6℃,有效积温为179.1日.度、360.0日.度、787.8日.度。在18,21,24,27和30℃等5种恒温条件下其平均世代历期214.4,133.3,79.2,66.3和50.7d。

The biological characteristics of Locusta migratoria tibetensis

The Locusta migratoria tibetensis Chen occurs 1 generation annually in Ganzi State of Sichuan Province but in some area (Xiangcheng County) it occurs incomplete 2 generations per year and the eggs are laid in soil to overwinter.The first generation begins to hatch at late March and reach the hatching peak in middle or late April.The 1～3 instar initial booming period is from middle April to middle May,and reaches the peak period in late May. The adult emergence time is in early July,and reaches the eclosin peak period from late July to early August.The adults begin to oviposit in early August, the ovipositional peak period is from late September to early October. Some eggs oviposited early by the first generation can hatch from soil in early September in the same year,but the incomplete second generation can not overwinter. Under the condition of 18,21,24,27 and 30℃, the developmental threshold temperature of egg, the whole nymphs and the whole generation is 14.2, 16.1 and 14.6℃, respectively; the effective accumulative temperature is 179.1, 360 and 787.8 day-degrees,respectively.