宁夏枸杞炭疽病病情判别的气象指标

Discriminance of Meteorological Indicator for Occurrence of Colletotrichum Gloeosporioides Penz of Chinese Wolfberry (Lycium chinense) in Ningxia

以"宁杞一号"枸杞品种为供试材料,研究气象条件对枸杞炭疽病发生流行的影响并尝试给出其界限指标。根据4a的取样调查结果,分析显示:成熟前28d内的平均相对湿度RH28、降水(包括降水量R28和有效降水日数PD28)和前12d内的平均风速W12是影响枸杞炭疽病暴发流行的关键气象因子。用这三个关键影响因子和病情指数,通过快速聚类结合人工判读的方法建立了宁夏枸杞炭疽病病情判别的气象指标,经回代检验判别的准确率达到66%以上。研究结果可为监测、预测枸杞炭疽病发生程度及合理制定枸杞炭疽病防治策略提供科学依据。

The impacts of the meteorological factors on the occurrence of the colletotrichum gloeosporioides Penz of Chinese Wolfberry （Lycium chinense） in Ningxia were studied to determine the discriminant indexes and their thresholds. The results of a four years experiment indicated that the key meteorological factors influencing outbreak of the colletotrichum gloeosporioidcs were the mean relative humidity and the precipitation, in- cluding rainfall and available precipitation days during 28 days before mature period, and the mean wind speed during 12 days before mature peri- od. Based on the index of colletotrichum glocosporioidcs occurrence, the discriminant index of meteorological factors was determined by methods of k-means cluster and artificial judgement. The accuracy of discriminance was with 66% tested by historic data.