![]() ![]() ![]() Sources of Phytophthora infestans in New England include potatoes saved year to year for seed, tubers that survive the winter unfrozen in the soil, and volunteer potato and tomato plants in compost, cull piles, or fields. These genotypes differ in mating type, host aggressiveness, and fungicide resistance. In 20, the continually evolving pathogen was again primarily a problem for tomato crops US23 (2012) and US24 (2013).īackground: Late Blight has occurred in New England in recent years and different strains of the pathogen have been responsible: US11 (1994-1998), US8 (1992-2010), US17 (1996-1997), and US 22 (2009-2010). US22 was detected in tomato plants for sale in garden centers in numerous states by extension specialists. First reports of the pathogen were recorded in late June, the earliest incidence of widespread disease ever observed in our region. This new genotype of late blight, US22, caused a disease epidemic throughout the Northeast. Typically, potato is the main crop affected in 2009, a strain aggressive on tomato was present on tomato transplants. In 2009, the disease was widespread and developed early. ![]() Late Blight outbreaks from 2005 to 2008 developed during late summer/early fall and were the result of inoculum (sporangia) carried on storm systems that originated in southern areas where the disease was active. Late Blight caused by the fungus-like organism, Phytophthora infestans, occurs sporadically in most of New England in most growing seasons. Photos of Late Blight on Tomatoes, Many good close-up photos from the Long Island Horticultural Research and Education Center ![]()
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