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Since 2011 the vegetable working group has teamed up with Cornell University’s NEWA to bring
tomato and potato late blight and early blight forecasting to vegetable growers through out New Jersey.
Over 50 weather stations from Sussex to Cape May County now offer disease as well as insect
forecasting services for numerous important pests.
The website managed by the New York state Integrated Pest Management (IPM) program and Cornell
University can be found at http://newa.cornell.edu/. Just click on the map and scroll down to New
Jersey and chose a weather station within the closest proximity to your operation. Once you choose a
location a new web page will appear with the different forecasting options to choose from. For example,
clicking on the potato early blight will automatically generate daily and accumulative P-day values
for you for that location. Remember once 300 P-days are accumulated, spray programs for early
blight control should be initiated. Clicking on either tomato or potato late blight will bring up a table
which will provide daily rainfall, average temperature, hours above 90% RH and daily and accumulative
DSV values for that location. One important thing to remember for the disease forecasting is to
track the accumulation of DSV or P-day values based on when you transplanted tomatoes or when
potatoes emerged on your farm. To track the progress of Late blight in the US please visit
http://usablight.org/.