Rutgers Cooperative Extension
The crew of the Plant Diagnostic Laboratory are always on the hunt for new and exciting examples of plant damage. Last week, out walking her dog, Sabrina Tirpak our Principle Technician and photographer happened upon a red maple with these amazing red leaf spots.
Dramatic leaf spots caused by the ocellate maple gall midge, Acericecis ocellaris. Photo: Sabrina Tirpak, Rutgers PDL
5-21-13 Tomato Report – Click to Download
Disease severity values (DSVs) for early blight, septoria leaf spot, and tomato anthracnose development are determined daily based on leaf wetness (due to rainfall, dew) and air temperature.
On a daily basis DSV values can range from 0 to 4 where 0 = no chance for disease development to 4 = high chance for disease development.
DSVs are accumulated during the production season.Fungicide applications are based on an individually determined DSV threshold. The first fungicide application for the control of these three diseases is not warranted until 35 DSVs have accumulated from your transplanting date. After that, growers can base fungicide applications on different DSV thresholds.
Potato Disease Forecasting Report 5-21-13 – Click to Download
Welcome to the new potato report for 2013! As always, we will be tracking DSVs for Late blight development and calculating P-days for initiating the first early blight fungicide application. Remember the threshold for P-days is 300! Once 300 P-days is reached for your location early blight fungicide applications should be initiated.
5-14-13 Potato Report Updated report. Sorry folks, the information at the bottom of the original 5/14/13 report was not intended. No reports of Late blight in NJ.
Welcome to the new potato report for 2013! As always, we will be tracking DSVs for Late blight development and calculating P-days for initiating the first early blight fungicide application. Remember the threshold for P-days is 300! Once 300 P-days is reached for your location early blight fungicide applications should be initiated.
With the wet weather we’ve experienced in New Jersey over the weekend and the warm temperatures to follow this coming week Phytophthora blight (P. capsici) and Pythium are likely to start showing up in pepper, tomato, and cucurbit fields. [Read more…]
Brown marmorated stink bugs (BMSB) are expected to begin dispersing into fruit orchards any day. [Read more…]
