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为抗马铃薯晚疫病品种的选育、生产布局以及选择防治的最佳时机提供参考,根据2007和2008年在贵州西部地区水城的玉舍(海拔1950 m)、盘县的四格(海拔2250 m)和六枝的堕却(海拔1610 m)各3期的马铃薯晚疫病发生程度的地理分期播种试验资料,对贵州西部地区马铃薯晚疫病发生、流行的气象因子和动态特征进行了研究,结果表明:马铃薯晚疫病发生、流行的主要时期在5月下旬至7月上旬;5月上旬至中旬,若日平均温度低于20℃,且连续3 d相对湿度超过75%,同时连续降雨日超过5 d的情况下,一般在15~20 d后有晚疫病发生、流行。因此,建议以此作为马铃薯晚疫病防治的预警指标,以便在预警指标出现后的3 d内积极组织防治,以提高防治效果。
According to 2007 and 2008 in Wushe of Watertown in western Guizhou Province (1950 m above sea level), the four grids of Panxian (elevation 2250 m ) And six fall (1610 m altitude) three stages of potato late blight stage of the geographical sowing trial data on the incidence of late blight in western Guizhou potato epidemic meteorological factors and dynamic characteristics were studied, the results show that : Late blight of potato occurs, the main period of epidemic is from late May to early July; if the average daily temperature is below 20 ℃ in early May and the relative humidity exceeds 75% for 3 consecutive days, the continuous rainfall day exceeds 5 In the case of d, the late blight usually occurs after 15-20 days. Therefore, it is recommended to use this as an early warning indicator for the control of late blight in potato so that the prevention and control can be actively organized within 3 days after the early warning indicator appears to improve the control effect.