Selection of resistant varieties is the best strategy for managing late blight. McGrath, Cornell University.įor more information on identifying late blight, see the eOrganic video Identifying and Scouting for Late Blight on Organic Farms. Late blight clearly is unlike many other diseases and cannot be “lived with”. With such a contagious and destructive disease, not effectively managing late blight, even in a small garden, can have a detrimental impact on other tomato and also potato plants in farms and gardens. The pathogen produces an abundance of spores that are easily dispersed several miles by wind (up to 30 miles is possible). Late blight has been likened to wildfire by those whose plants have been afflicted.
#Tomato leaf blight plus
Disease progresses quickly under humid conditions, which are favorable for the pathogen, particularly when accompanied by cool temperatures plus rain, heavy dew, or fog.
Total crop loss is not unusual, especially if management practices are not used, because the pathogen directly affects fruit and kills plants. Late blight, which is caused by the pathogen Phytophthora infestans, is one of the most destructive and contagious plant diseases. Check the late blight occurrence maps at. Resistant varieties will continue to be an important management practice, especially where late blight occurred recently, but also because there remains potential for another resurgence of this disease. This article was written during a period when late blight was occurring much more commonly than in recent years, especially in the northeastern USA. Margaret Tuttle McGrath Ph.D., Plant Pathology and Plant-Microbe Biology, Cornell University 2022 Update: Current Disease Situation in the USA
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