水稻不同栽插方式对稻田主要害虫种群的影响

对江苏响水地区直播稻、抛秧稻、机插秧等不同栽插方式水稻田的灰飞虱、褐飞虱、白背飞虱和稻纵卷叶螟等稻田主要害虫的发生危害进行了调查研究。结果表明,和常规育秧手插移栽田相比,在分蘖末期,直播稻、抛秧稻、机插稻田灰飞虱分别降低46.6%、44.7%和33.4%,褐飞虱和稻纵卷叶螟无大变化;在抽穗期,直播稻、抛秧稻、机插稻田褐飞虱分别降低10.6%、3.6%和25.7%,稻纵卷叶螟分别减轻了34.9%、46.2%和62.5%。说明直播稻、抛秧稻、机插稻等轻型栽培方式对不同生育期水稻的主要害虫发生都有一定的抑制作用。

Influence of the Different Planting Patterns on Major Pest Population in Rice Field

By field investigation and comparison experiments,the occurrence and harm of major pests such as small brown planthopper,brown planthopper,white-back planthopper and rice leaf roller were investigated and studied in rice field with different planting patterns,such as direct seeding rice,throw seeding rice and mechanical transplanting rice in Xiangshui region of Jiangsu province.The results showed that compared with transplanted field by artificially conventional seedling,during the late stage of tillering,the occurrences of small brown planthopper in direct seeding,throw seeding and mechanical transplanting rice field decreased by 46.6%,44.7% and 33.4% respectively,while the changes of brown planthopper and rice leaf rollers were little in the rice field with 3 planting patterns.During the heading stage,the brown planthopper in direct seeding rice field,throw seeding rice field and mechanical transplanting rice field decreased by 10.6%,3.6% and 25.7%,while rice leaf rollers reduced by 34.9%,46.2% and 62.5% respectively,indicating that the cultural methods like direct seeding rice,throw seeding rice and mechanical transplanting rice all had certain inhibiting effect on the occurrence of major pests in rice field in different growing period.