螺旋粉虱为害对四季豆产量的影响及其防治指标研究

通过设置田间笼罩试验,确定了螺旋粉虱不同种群发生密度对四季豆产量的影响。研究结果表明,随着螺旋粉虱虫口密度的增加,四季豆平均荚果长度、平均最粗处周长、平均单果质量、每株豆荚数量和质量均显著下降,虫口密度与豆荚质量呈显著负相关。在研究产量损失的基础上,确定了不同产量水平下四季豆的经济允许损害水平和螺旋粉虱防治的经济阈值。当产量为1 500 kg/667 m~2时,四季豆的经济允许损害水平为9.80%,螺旋粉虱防治的经济阈值为11对成虫。

Effects of Damaged by Aleurodicus disperses on Yield of Kidney Bean and Study on Related Control Indexes

By setting shrouded test in field, we studied the effects of different population occurrence densities of Aleurodicus disperses on yield of kidney bean. The results showed that, with the increase of population density, the average pod length, thickest perimeter and single pod weight, pod number and weight of a single plant were significantly decreased, and population density of A. disperses was significantly negatively associated with pod weight. On the basis of the study of yield loss, we obtained the economic injury levels of kidney bean and economic thresholds of A. disperses prevention under different yield levels. While the yield was 1 500 kg/667 m2, the economic injury level of kidney bean was 9.80%, and the economic thresholds were 11 pairs of A. disperses adult.