Abstract:

Based on the demonstration project of climate test on winter-planting potato from 2015 to 2018 which was established in the comprehensive scientific research base of Liupanshui Academy of Agricultural Sciences, Guizhou (Yanjiao Town of Liuzhi County, altitude of 1100 m), and combined with the monitoring results of potato late blight in Nayong, Zhijin, Fenggang, Yuping, Tongren, Leishan, Duyun, Pu’an, Qingzhen and Puding of Guizhou Province from 2017 to 2018, the meteorological conditions and dynamic characteristics of potato late blight occurrence in the province were analyzed. The results showed that the late blight of winter-planting potato occurred mainly in April, which was the growth stage from flower budding to flowering. In this growth stage, when the daily average temperature≤18℃ and the relative humidity>75% lasted for 3 days or more, and the daily average temperature>18℃ and the relative humidity>80% were on the fourth day and thereafter, the late blight of winter-planting potato could be observed. Therefore, it is suggested to use the above conditions as a meteorological early warning indicator for the prevention and control of late blight of winter-planting potato, so as to actively carry out the prevention and control within three days since the emergence of the early warning indicator and improve the control efficiency.

Key words: potato, winter-planting, late blight, monitoring, temperature, relative humidity