茄田和菜用大豆田烟粉虱成虫数量及空间格局动态差异

运用随机抽样方法进行田间系统调查,并用t检验法、种群聚集强度指标及地统计学方法,对茄田和菜用大豆田烟粉虱成虫数量及空间格局差异进行研究。结果表明,7月7日至8月25日茄田烟粉虱成虫种群增长模型为y=3053e0.0053x(r=0.823*),菜用大豆田烟粉虱成虫种群增长模型为y=2356e-0.1662x(r=-0.9631**),对茄田和菜用大豆田烟粉虱成虫种群数量之间的差异性进行t检验,t值为3.3333,df=7时,t0.05=2.365,两者之间差异显著。这期间两种作物上烟粉虱成虫的田间水平分布和在茄株叶片上的垂直分布均呈聚集分布格局。

Differences in population dynamics and space patterns between adult tobacco whiteflies from eggplant and soybean fields

Tobacco whiteflies,which can cause disease of host plants,may do severe harm to the crops.Most studies have focused on the features of their damage of the pest,but little attention has been paid to their population dynamics and space pattern.To improve the level of forecast and prevention,the difference of the population dynamics and space patterns of tobacco whiteflies from eggplant and soybean fields were examined using field system investigation of random sampling method.In this study,geostatistics together with aggregated-intensity index and t-test were applied.Results indicated the population growth model of adult tobacco whiteflies is y=3053e0.0053x(r=0.823) and y=2356e-0.1662x(r=-0.9631) respectively from July 7th to August 25th.The number of tobacco whiteflies was significantly higher in eggplant fields than those in soybean fields using t-test(t=3.3333,t 0.05=2.365,df=7).During this period,horizontal distribution of adult tobacco whiteflies displayed an aggregation pattern both in eggplants and soybeans,and so did their vertical distribution on the leaves of eggplants.