东北地区亚洲玉米螟危害损失测定模型研究

研究并建立玉米螟产量损失与不同代数(一代、二代及一二代混合发生)幼虫数量及产量损失与产量构成因子、相关生育指标间的关系,便于制定更加准确且适应种群发生规律变化的防治指标。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和回归关系,仅一代幼虫和仅二代幼虫的危害具有独立性,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。

Injury Determination Model of Asian Corn Borer Ostrinia furnacalis (Guenée) in the Northeast of China

To found a more accurate control index for managing the Asian corn borer, Ostrinia furnacalis, in a timely manner, this study established the relationship between yield loss and the number of active larvae in each generation, and determined yield components and related birth quota of corn. Regression analyses revealed a significant correlation between the egg amount of corn borer and yield loss. The results suggested that the damage caused by the first and the second generation larvae were independent of each other. Furthermore, the main yield losses were caused by the second generation larvae. This was the first report on the injury determination by the first and the 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.