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【目的】研究吐鲁番枣棉套作田烟粉虱及优势寄生蜂桨角蚜小蜂种群动态及空间分布规律。【方法】根据日温度变化特点,分别在早晨(08:00am)、中午(14:00 pm)和黄昏(19:00 pm)3个时间段调查。【结果】早晨08:00 am平均温度较低时,烟粉虱成虫数量均表现出的分布特征,但在多数调查点未达到显著性差异水平。中午14:00 pm和黄昏平均温度较高时,为适应严酷的高温、干旱气候条件,烟粉虱成虫表现出向下部叶片转移的现象。在早晨(08:00am)温度较低时,棉花上桨角蚜小蜂平均虫口数量最低,而在中午14:00 pm平均温度较高时,成蜂数量升高。枣棉套作田棉花上烟粉虱若虫及被桨角蚜小蜂寄生的若虫的发生动态及空间分布规律表现出极大的相似性,均为中部>下部≥上部,中部是烟粉虱若虫喜居的部位。【结论】研究调查的棉田在温室的顺风向位置,同时,由于枣棉套作田枣树的防风作用,烟粉虱成虫表现为中、上部虫量大的空间分布特点。优势寄生蜂跟随烟粉虱的发生及空间分布,表现出相似的规律性。
【Objective】 The objective of this study was to investigate the population dynamics and spatial distribution patterns of Bemisia tabaci (Myzus persicae) in Turpan cotton fields. 【Method】 According to the characteristics of daily temperature changes, the investigation was conducted in three time periods: morning (08:00 am), noon (14:00 pm) and evening (19:00 pm). 【Result】 The results showed that the population of B. tabaci adults showed a distributional characteristic when the average temperature was low at 08:00 am, but no significant difference was found at most of the survey sites. At 14:00 noon and the average evening temperature was high, the adults of Bemisia tabaci showed the transfer to the lower leaves in order to adapt to the severe high temperature and arid climatic conditions. When the temperature was low in the morning (08:00 am), the average number of insects on the cotton aphid was the lowest, while that on the cotton aphid rose at 14:00 apm. The dynamics and spatial distribution of nymphs on the cotton buds of B. tabaci on the cotton fields and on the nymphs that were parasitized by the beeshopper Aphis gossypii showed a great similarity, both in the middle part> the lower part> the upper part, and the middle part was the whitefly nymph The site. 【Conclusion】 The study investigated the downwind position of cotton field in the greenhouse. At the same time, adults of Bemisia tabaci showed the spatial distribution characteristics of the upper and middle insect populations due to the windbreak of the jujube tree. The dominant parasitoids followed the occurrence and spatial distribution of B. tabaci and showed similar regularities.