亚洲玉米螟Ostrinia furnacalis(Guenée)是重要的玉米害虫。过去,针对该虫的有害生物综合治理(IPM)策略是以玉米螟的卵量作为防治指标。然而,近年来由于东北地区玉米螟的种群发生规律发生了改变,以卵量作为防治指标已不能准确预测玉米螟的发生及其导致的产量损失。为了制定更加准确且适应种群发生规律变化的防治指标,本试验研究并建立了玉米螟产量损失与不同代数(一代、二代及一二代混合发生)幼虫数量,以及产量损失与产量构成因子、相关生育指标间的关系。试验结果表明,不同生育期的玉米螟卵量与产量损失之间呈显著相关性和回归关系；仅一代幼虫和仅二代幼虫的为害具有独立性,且第二代幼虫是造成玉米产量损失的主要世代。在此基础上,分别建立仅一代、仅二代玉米螟幼虫数量与产量损失的数学模型,并根据模型特性以叠加的方式得到一二代混合发生的玉米螟幼虫数量与产量损失之间的数学模型。
英文摘要:
Ostrinia furnacalis, commonly known as the Asian corn borer, has greatly reduced corn yield in China. Currently, the number of corn borer eggs is used as a control index in Integrated Pest Management (IPM). However, this index is not suitable for IPM strategy in Northeast China as the occurrence regularity of O. furnacalis has changed. To found a more accurate control index for management this pest in a timely manner, we established the relationship between yield loss and the number of active larvae in each generation, and determined yield structure components and related birth quota of corn. Regression analyses revealed a significant correlation between the degree of corn borer infestation and yield loss. Our results suggest that the damage caused by first and second generation larvae were independent of each other. Furthermore, the main yield losses were caused by second generation larvae. This is the first report on the injury determination by the first and second, as well as mixed generations of the Asian corn borer. The regression models of each can be combined to approximate crop yield loss of mixed infestations.
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