再生稻二化螟防治指标的研究

在福建省,二化螟是再生稻的重要害虫。作者对第二代二化螟为害前季稻造成的产量损失结构进行了通径分析。通过田间调查和小区试验,建立了再生稻二化螟防治指标模型: ET=(100C·F-P·E(0.0037N_1 0.1207N_2))/(P·E(0.0123N_1 0.0098N_2)) (卵块密度) ET=(100C·F-P·E(0.0097N_1 0.1258N_2))/(P·E(0.7077N_1 0.5601N_2)) (枯鞘株率) 按照防治指标模型,制定出不同产量水平的防治指标。

STUDIES ON THE ACTION THRESHOLD OF RICE STRIPED BORER ON REGENERATE RICE

Rice striped borer (Chilo suppressalis Walker)is a major pest on regenerate rice in Fujian Province. In this paper, the structure of rice yield losses caused by second generation C. suppressalis in first crop rice were analysed with path analysis method. Based on the field investigation and plot experiment,the models of action threshold of rice striped borer to regenerate rice were set up as follows: (1)the egg cluster density (2)the percentage of withered sheath plants According to the models,the action thresholds in different yield level rice fields were deter- mined.