栽培模式与除草方式对抗除草剂杂交早稻病虫害发生及防治的影响

以抗除草剂两系杂交早稻香125S/Bar68-1为材料,比较了直播、抛秧、机插3种轻简栽培模式与草胺膦除草、常规除草两种除草方式对水稻病虫害发生的影响。结果表明:栽培模式对病虫害发生的影响大于除草方式;直播栽培模式下稻飞虱发生明显较轻,抛秧栽培模式下纹枯病始发期较机插、直播早;各处理采取的防治方案对稻飞虱的防治效果显著,对稻纵卷叶螟、纹枯病、稻曲病等的防效也明显,但对二化螟的防效不佳;建议施药时间以二化螟达到防治指标为开始时间,一般在5月26~28日第1次施药,约2周后第2次施药。

Influence of Occurrence and Control of Diseases and Insect Pests of Herbicide Resistant Early Hybrid Rice by Different Cultivation Patterns and Weeding Methods

Taking the herbicide resistance of two-line early hybrid rice Xiang 125S/Bar68-1 as material, compared among the direct seeding, seedling throwing and machine-transplanted, the three kinds of easy and simple cultivation mode and phosphinothricin herbicide, conventional weeding on the effect of occurrence of rice disease and insect pest. The results showed that the effect of cultivation mode on the occurrence of pests and diseases was greater than the way of weeding; under direct seeding cultivation mode, signiifcantly the less occurrence of rice plantthopper, the sheath blight initial period under seedling throwing mode is earlier than machine-transplanted mode and direct seeding mode; the control technology had signiifcant control effect against rice planthopper, the control effect of rice leaf roller, sheath blight, rice false smut is obvious, but the control effect of chilo suppressalis is unsatisfactory; the time of applying pesticide for chilo suppressalis is suggested that achieve the control index for the start time, the ifrst spraying normally in May 26th-28th, approximately 2 weeks later for the second spraying.