摘要
作者就褐稻虱在水稻扬花后对米粒灌浆的影响进行定量研究。结果表明,米粒干物质的累积量与扬花后的天数呈极显著的logistic曲线关系。干物质积累总量、起始增长势、干物质积累旺盛期以及最大日增量均与褐稻虱虫量呈极显著的负相关。仅占籽粒充实总日数38.6％的灌浆盛期中,积累的干物质重为成熟时籽粒干重的65.84％,这是决定稻谷千粒重的关键时期。在孕穗末期到齐穗后的20d内,应尽可能地将褐稻虱种群控制到最低水平,孕穗末期在使用高活性药剂扑虱灵、吡虫啉时,用药有效剂量需确保控制效果30～35d,可获得最大的经济效益。
Quantitative tests were conducted to explore the effect of damage after flowering of brown planthopper Nilaparvata lugens Stal on the milking process of rice grain. The results showed that there was highly significant sigmoid increase of dry matter accumulation along with the day number after flowering. All the indices of dry matter,including totalled accumulation, initial increase potential, duration of vigorous accumulation period and maximum daily increase, were high-significant-negatively related with the number of brown planthopper. 65. 8% of the dry weight of mature grain accumulated in the peak milking period, the key period of thousand kernel weight increase which was only 38. 6 % of the totalled day number of grain growth.
The practice results of control showed that it is necessary to keep the population of brown planthopper as low as possible in the 20 days duration from late booting to full ear stage, for getting highest economic benefit, and the efficacies of high-effective insecticides such as buprofezin and imidacloprid must be maintained for 30 - 35 days since the spraying in late booting stage.
出处
《植物保护学报》
CAS
CSCD
北大核心
1997年第4期326-330,共5页
Journal of Plant Protection
