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2012年6月13日至9月16日期间,在湖北省太湖农场采用系统调查法对种植在不同类型的由水稻改造成棉花田的、由抗螨的母本(鄂抗棉9号)育成的转Bt基因棉(鄂杂棉24F1)的棉叶螨数量动态调查和棉叶总酚含量测定。结果表明,由水稻田改造为棉花田后,1~2年棉田棉叶螨数量较低,棉叶螨发生量随着连作棉花年限增加而增加,前2年由水稻改造后连作的棉花田棉叶螨发生量极显著高于前1年的、当年的棉田,分别约为前1年的2倍、当年的3倍。不同类型田的棉花叶片棉总酚含量存在一些差异,但没有影响棉花上棉叶螨的数量。棉叶螨数量、有螨株率分别与棉叶总酚含量的线性相关性不明显。由水稻田改造成棉花田后,棉叶螨数量的下降,有可能与棉田的湿度和棉叶螨越冬基数有关。在农业灌溉设施齐全区域,推广水稻-棉花轮作模式,能够有效地降低棉叶螨的种群数量。
From June 13, 2012 to September 16, 2012, a systematic survey was conducted in Taihu Lake Farm in Hubei Province to cultivate different types of rice plants transformed from paddy fields into cotton fields (E-resistant cotton 9) The dynamic quantity of cotton spider mite (Gossypium barbadense) and the determination of the total phenolics in cotton leaves of transgenic Bt cotton (E-cotton 24F1) were studied. The results showed that the number of cotton spider mites in cotton fields decreased from 1 to 2 years after transformation from paddy fields to cotton fields, and the spider mite occurrence increased with the continuous cotton growing years. In the first two years, The incidence of spider mites was significantly higher than that of the previous year. The cotton fields in that year were about twice as much as the previous year and three times as much as the previous year respectively. There were some differences in total phenolic content of cotton leaves in different types of fields, but did not affect the number of cotton spider mites on cotton. The linear correlation between the number of cotton spider mites and the rate of mite plants was not obvious with the total phenolics content of cotton leaves. After transformation from paddy field into cotton field, the decrease of the number of cotton spider mites may be related to the cotton field humidity and the number of overwintering cotton mites. Popularizing paddy-cotton rotation patterns in areas with agricultural irrigation facilities can effectively reduce the population of cotton spider mites.