【摘要】 旨在通过定点定期系统调查水稻白叶枯病发病级别和穗部性状指标,分析浙西北单季稻白叶枯病发病率与稻谷损失的关系。结果表明,不同病级受害植株的穗长、每穗粒数无显著差异,而株高、每穗实粒数、空瘪粒数、实粒重、总粒重和千粒重在处理间有显著或极显著差异。其中1~2级植株与对照(未受害株)差异不显著,3~4级植株的相关指标显著或者极显著少(轻)于对照。每穗实粒数、实粒重、总粒重和千粒重分别下降20.9%~30.8%,24.3%~36.1%,20.3%~28.1%和4.3%~7.6%,每穗空瘪粒数增加132.3%~139.8%,而且受害病级越严重,这些指标的下降或增加程度越显著。构建了11个植株在白叶枯病发病初期、激增期、稳定期的发病率与稻谷损失率的相关性达到显著或极显著水平的直线回归方程。研究结果可为浙西北单季稻区白叶枯病的预测预报和科学防治提供依据。更多还原

【Abstract】 The relationship between incidence of rice bacterial blight Xanthomonas campestris and grain loss of singlecropping rice was analyzed by investigating the incidence level and panicle traits of X. campestris at the same site and date. The results showed that there was no significant difference in panicle length and seed number per ear among different levels of infested plants. However,plant height,filled grain number per panicle,empty flat grain number,filled grain weight,total grain weight per panicle,and 1 000-seed weigh varied or significantly varied among treatments. The differences between control and 1-2 level plants were not significant,but the related indicators of 3-4 level plants were significantly less than those of the control. Filled grain number per panicle,grain weight,total grain weight per panicle and 1 000-seed weight were decreased by 20. 9%- 30. 8%,24. 3%- 36. 1%,20. 3%- 28. 1% and 4. 3%- 7. 6%,respectively,while empty flat grain number per panicle was increased by 132. 3%- 139. 8%.The more serious infested plants,the more significant decrease these parameters. Eleven linear regression equations of disease incidence and grain loss of infested plants at the initial,surge and stable periods of X. campestris were constructed. Such information will be useful in providing basis for forecasting and scientifically controlling X. campestris in the Northwestern Zhejiang.更多还原