Response of cotton cultivars with varying maturity traits to cotton fleahopper (Hemiptera: Miridae) feeding.

Malek A Alwedyan, Anjel M Helms, Michael J Brewer
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Abstract

Cotton fleahopper, Pseudatomoscelis seriatus Reuter (Hemiptera: Miridae), is an early season pest of upland cotton, Gossypium hirsutum L. Feeding damage from this pest causes square abscission. The response of commercial cotton cultivars with varying maturity traits to cotton fleahopper feeding was assessed. The hypothesis was that feeding affects early and late-maturing cultivars differently in maturity delays and yield. Field experiments with natural and artificial infestations were conducted in Corpus Christi, TX. For the natural infestation experiment, 4 cultivars (DP 2020 B3XF, DP 2012 B3XF, PHY 332 W3FE, and PHY 545 W3FE) were assigned to main plots, with subplots either sprayed or not sprayed with thiamethoxam insecticide to control cotton fleahopper early in the season. The artificial infestation experiment used 2 cultivars (DP 2020 B3XF and PHY 545 W3FE) as main plots, with subplots infested to or not infested with cotton fleahopper using single square caging. In the no-spray subplots of the natural infestation experiment, cotton fleahopper feeding increased square abscission, leading to yield loss and delayed boll maturity, especially in cultivars classified as late-maturing. Early maturing cultivars consistently showed faster boll opening regardless of cotton fleahopper. Artificial infestation experiments further confirmed increased square abscission, reduced boll numbers, and lower lint weights when infested with cotton fleahopper. Early maturing cultivars are more resilient and may be particularly useful in areas with high cotton fleahopper pressure, especially when scheduling an early harvest is desirable.

不同成熟性状棉花品种对棉蚤取食的响应。
棉蚤,Pseudatomoscelis seriatus Reuter(半翅目:棉蚤科),是陆地棉棉的早期害虫。评价了不同成熟性状商品棉品种对棉蚤取食的反应。假设取食对早熟和晚熟品种的成熟期和产量影响不同。在德克萨斯州科Corpus Christi进行了自然侵染和人工侵染的田间试验。在自然侵染试验中,将4个棉花品种(DP 2020 B3XF、DP 2012 B3XF、PHY 332 W3FE和PHY 545 W3FE)划分为主区,分区喷洒和不喷洒噻虫脒,以防治棉蚜。人工侵染试验以2个品种DP 2020 B3XF和PHY 545 W3FE为主区,分侵染和不侵染小区,采用单方笼。在自然侵染试验的无喷雾亚区,棉蚤取食增加了棉花的方形脱落,导致产量损失和棉铃成熟延迟,特别是在晚熟品种中。早熟品种均表现出更快的开铃速度。人工侵染实验进一步证实,棉铃虫侵染后,棉方脱落增加,铃数减少,棉重降低。早熟品种的抗灾能力更强,在棉铃虫压力大的地区可能特别有用,特别是在希望提前收获的情况下。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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