Potato Late Blight Fungicide intervals
The pages linked below use site-specific hourly weather observations and forecasts to estimate severity and management timing for potato late blight and early blight. Updates will resume in June 2024.
Ashland
Bridgewater
Caribou
Corinth
Dover Foxcroft
Easton
Fort Fairfield
Fort Kent
Houlton
Monmouth
Newport
North Chester
Presque Isle
St. Agatha
Van Buren
Weather data from AgEye Weather, Sean D. Birkel, Maine Climate Office,
Potato site assistance by G.W. Koehler, UMaine Extension.
Model calculations, design, web posting, and updates by AgRadar, Glen W. Koehler.
Liaison to Maine Potato Board: Andrew Plant.
Late blight spray intervals based on “Potato Facts: Late Blight Prediction in Maine”, Steven B. Johnson, 2005. UMaine Cooperative Extension Bulletin #2418, https://extension.umaine.edu/publications/2418e/.
Early blight P-values based on “Comparison of forecasting methods for control of potato early blight in Wisconsin”. J. W. Pscheidt, and W.R. Stevenson, 1986. Plant Disease 70:915-920. https://www.apsnet.org/publications/plantdisease/backissues/Documents/1986Articles/PlantDisease70n10_915.PDF