Late blight caused by the US-24 isolate was significantly reduced compared with US-22 and US-23 isolates for all fungicide treatments applied after inoculation, as well as for all preventative fungicide treatments, with the exception of Bravo, Ridomil, and Revus. Additionally, preventative application of Phostrol significantly controlled late blight caused by the US-22 isolate and Phostrol, low rate of Mycostat, and high rate of Champ significantly controlled late blight caused by the US-23 isolate. Preventative fungicide applications of Bravo Ultrex, Ridomil Gold SL, Revus, Zonix, and low and high rates of EF400 significantly controlled late blight caused by US-22, -23, and -24 isolates. Fungicide applications made 2 days after inoculation failed to significantly control late blight on detached leaves in all treatments, with the exception of Bravo Ultrex (US-23 only) and Phostrol (US-22 only). A subset of the most effective fungicides was also tested for preventative control of a single infection cycle of late blight caused by an isolate of US-23 on potted whole tomato plants under laboratory conditions. infestans clonal lineages (US-22, US-23, and US-24) using a detached tomato leaf assay. Twelve fungicides, including organic and conventional selections, were evaluated for both preventative and postinfection control of a single infection cycle of late blight caused by isolates representing three recently identified P. ![]() ![]() For organic production, fungicide choices are limited, and little efficacy data on noncopper options is available on which to base control recommendations. ![]() Repeated preventative application of fungicides is the primary means of control on susceptible solanaceous host crops. Late blight, caused by Phytophthora infestans, is one of the most economically important diseases of potato and tomato worldwide.
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