库尔勒市香梨园山楂叶螨自然种群连续世代生长发育和繁殖研究

目的]对香梨园山楂叶螨自然种群连续世代的生长发育和繁殖进行研究,分析山楂叶螨种群的发生规律.方法]通过系统调查和室内观察,采用平均历期法研究香梨园山楂叶螨不同世代的生长发育和繁殖.结果]在山楂叶螨不同世代上,各虫态历期、单雌产卵量、存活率和种群参数均有较大差异.11代的世代历期分别为19.9、16.7、13.9、13.5、11.5、12.2、11.7、10.4、12.3、13.0和34.8 d；内禀增长率和净增殖率在第2代最高,分别为0.075 9和9.29,而在第7代最低,分别为-0.200 5和0.02.存活率在第2代最高,为35;,其次为第3和第11代,为31;,在第7代最低,仅有1;.结论]在山楂叶螨不同世代上,第2代的生殖力最强,第3代次之,第7代的生殖力最弱.

Study on Development and Fecundity in Successive Generations of Natural Population of Tetranychus Viennensis Zacher in Korla Pear Orchard

【Objective】To study the development and fecundity in successive generations of natural population of Tetranychus viennensis and analyze the occurrence regularity of this pest.【Method】After systematically investigation and indoor observation,the development and fecundity in eleven generations of T.viennensis were investigated by using the method of average developmental periods.【Result】The developmental periods of different stages,egg laying amount of single female,survival rate and parameters of population were varied in different generations.The generation periods of eleven generations of T.viennensis were 19.9,16.7,13.9,13.5,11.5,12.2,11.7,10.4,12.3,13.0 and 34.8 day,respectively.The second generation possessed the highest intrinsic rate of increase and net reproduction rate,0.075 9 and 9.29,respectively,while the 7th generation showed the lowest ones,-0.200 5 and 0.02,respectively.The highest survival rate(35%) showed in the 3th and 11th generation,followed by the second generation,31%,and the lowest one showed in the 7th generation,only 1%.【Conclusion】In the eleven generations of T.viennensis investigated,the 2nd generation possessed the highest fecundity,and followed by the 3rd generation,while the 7th generation showed the lowest one.