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通过田间调查,比较露地、窄膜、宽膜、全膜和秸秆覆盖下主要棉田害虫和天敌种群动态。结果表明,不同覆盖方式对棉蚜种群动态影响很大,除窄膜和宽膜覆盖之间差异不显著外,其他覆盖差异均达到极显著,7月16日全膜和秸秆覆盖达峰值,比露地、窄膜和宽膜覆盖早5 d;高峰时全膜覆盖棉蚜数量分别是露地、窄膜、宽膜和秸秆覆盖的2.56、1.78、2.16倍和5.93倍。对棉叶螨种群动态影响不同于棉蚜,整个调查期,窄膜、宽膜和全膜之间无论从数量还是增长速率来看都呈相似趋势,而秸秆覆盖棉田棉叶螨数量显著高于其他覆盖,高峰时分别高出露地、窄膜、宽膜和全膜覆盖9 584.4、7 816.4、7 540.4头/百株和8 436.8头/百株。不同覆盖下主要天敌种类基本一致,但种群变化并没有明显的规律。
Through field investigation, population dynamics of pests and natural enemies in main cotton fields covered by open field, narrow field, wide field, whole field and straw were compared. The results showed that the different coverage ways affected the population dynamics of Aphis gossypii significantly, except for the difference between narrow and wide film coverage, the other coverage differences reached extremely significant. On July 16, the total film and straw mulching peaked at a ratio The number of exposed cotton aphids was 2.56, 1.78, 2.16 times and 5.93 times that of the open field, narrow film, wide film and straw mulching at the peak, respectively. The effect of cotton spider mite population dynamics was different from that of cotton aphid. During the whole investigation period, the number of cotton spider mite covered by straw mulching was significantly higher than that of the cotton spider mite Other coverage and peak were higher than the exposed, narrow film, wide film and full film coverage of 9 584.4,7 816.4,7 540.4 head / 100 and 8 436.8 head / 100 strains. The species of the main natural enemies under different coverage are basically the same, but the population variation does not have obvious rules.