Characterization of the natural enemy community attacking cotton aphid in the Bt cotton ecosystem in Northern China.
Characterization of the natural enemy community attacking cotton aphid in the Bt cotton ecosystem in Northern China.
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DOI：
10.1038/srep24273
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发表时间：
2016-04-14
影响因子：
4.6
通讯作者：
Wu K
中科院分区：
文献类型：
--
作者：
Ali A;Desneux N;Lu Y;Liu B;Wu K
自1997年以来，Bt棉在我国的种植导致了棉花天敌群落的重要变化，但其对棉蚜（在常规棉花生态系统中是臭名昭著的）的抑制作用尚未完全记录。我们观察到强有力的证据表明蚜虫种群的自上而下的控制，例如，与隔离笼相比，在2011年，2012年和2013年，天敌对棉蚜的控制效率分别为60.2%，87.2%和76.7%。2011 - 2013年棉花露地调查中，棉蚜种群高峰出现在6月上旬至7月下旬（生育前期和中期）。棉蚜和天敌的种群密度在生育中期最高，在生育后期最低，在生育前期最低。蚜虫寄生性（Trioxys spp.，烟蚜茧蜂、瓢虫和蜘蛛是棉蚜的主要天敌。在转基因抗虫棉上，天敌通过提供生物防治服务，抑制了棉蚜种群在生育前期到中期的增长。
Planting Bt cotton in China since 1997 has led to important changes in the natural enemy communities occurring in cotton, however their specific effect on suppressing the cotton aphids (being notorious in conventional cotton ecosystem) has not been fully documented yet. We observed strong evidence for top-down control of the aphid population, e.g. the control efficiency of natural enemies on cotton aphid increased significantly in open field cages compared to exclusion cages, accounted for 60.2, 87.2 and 76.7% in 2011, 2012 and 2013 season, respectively. The cotton aphid populations peaked in early June to late July (early and middle growth stages) in open field cotton survey from 2011 to 2013. The population densities of cotton aphids and natural enemies were highest on middle growth stage while lowest densities were recorded on late stage for aphids and on early plant stage for natural enemies. Aphid parasitoids (Trioxys spp., Aphidius gifuensis), coccinellids and spiders were key natural enemies of cotton aphid. Briefly, natural enemies can suppress aphid population increase from early to middle plant growth stages by providing biocontrol services in Chinese Bt cotton.