Alarm—late blight of potato happens
updated at 2012-10-12 Click:


According to a survey, now our summer potato varieties mainly include Favorita, Long potato, Green potato, Jin potato, Kexin, Xindaping, Zhuang Potato, Jizhang potato, Atlantic, Dutch potato, etc, among which about 60% is weak in disease-resistance; potatoes in the North China and Northwest China grow intensively every year and management in the field is very extensive, which is favorable to the spread of potato late blight.


At present, it rains much in North China, Northwest China and other places where grow summer potato, and abundant rain period and growth period susceptible to diseases when potato blossom and tubers expand fit highly, which is beneficial for the spread of potato late blight. Besides, there is enough bacteria source in the field and the main varieties are susceptible to diseases, so it is predicted that potato late blight will seriously spread in most places of North China and Northwest China, some parts exist epidemic risk with infectious area reaching 15 million mu; the popular acme of diseases is during the first 20 days of August in the central and east of Inner Mongolia, the north of Hebei, the central and north of Shanxi, while it is during the last 20 days of August in most places of Northwest China and the west of Inner Mongolia.


Since the beginning of July, diseases successively appear in North China, Northwest China and other places, and the emergence period of core infected plant is earlier than last year and the ordinary year. It is respectively 10 and 8 days earlier than last year in Inner Mongolia andShanxi; it is 15 days earlier than the ordinary years and closing to last year inHebei. It is 10-15 days earlier than 2007 and 2009 when diseases happened seriously inGansu, and it is respectively 35 and 15 days earlier than last year and the ordinary years in Dingxi where diseases are serious perennially. According to the survey of the occurrence rate of each plant in different places at the beginning of August, usually it is 0.2-10%. It is 20-45% in serious fields of Hinggan League and Hanggin Rear Banner of Inner Mongolia, Chengde Paddock ofHebeiand Linxia of Gansu, and it reaches 90-100 inparticular fields of XinzhouShanxiand DingxiGansu.


According to the forecast of National Climate Centre, it rains more than that of the ordinary year in most places of North China the east of Northwest China in August, among which it will have a 30-60 mm rainfall in the next 10 days (August 6th -August 15th) in the east of Northwest China and the north of North China, which is very favorable for the expansion and spread of potato late blight.


Now it is the key period for yield formation of summer potato and plant protection institutes at all levels should monitor diseases well, understand the occurrence dynamic of potato in time and accurately release diseases forecast and alarm to guide farmers to scientifically prevent and control diseases.


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