- Cucurbit downy mildew has been confirmed on cucumber in New Jersey. All cucurbit growers need to scout on a regular basis. All cucumber growers need to add a downy mildew-specific fungicide to their weekly fungicide programs. There have been no reports of downy mildew in other cucurbit crops in New Jersey to date.
- There have been no new reports of Late blight in tomato or potato.
- Bacterial leaf spot in pepper has been reported in tomato and pepper.
- Reports of Dickeya dianthicola in potato continue across the east coast and mid-west. Dickeya dianthicola has been confirmed in 12 states to date. All potato growers are encouraged to scout fields and report any suspect plants/tubers. The best method for keeping your potato operation Dickeya-free is to adopt your own 0% Dickeya-tolerance policy.
Archives for August 2016
August 10, 2016 Andy Wyenandt
Vegetable Disease Briefs – 8/9/16
August 8, 2016 A.Wyenandt, W.Kline, and J.Ingerson-Mahar
Potato | Tomato Disease Forecast 8-9-16
Click to View | Download Report 8-9-16
Potato Disease Forecasting Report
We will be tracking DSVs for Late blight development and calculating P-days for initiating the first early blight fungicide application.
The first late blight fungicide application is recommended once 18 DSVs accumulate from green row. Green row typically occurs around the first week in May in southern NJ. An early season application of a protectant fungicide such as mancozeb (Dithane, Manzate, Penncozeb) or Bravo (chlorothalonil) as soon as the field is accessible is suggested. Please be vigilant and keep a lookout for suspect late blight infections on young plants. No late blight has been reported in our region to date.
Remember the threshold for P-days is 300! Once 300 P-days is reached for your location, early blight fungicide applications should be initiated. Growers who are interested in using this model should choose the location above that is closest in proximity to their farming operation and should regularly check the Cornell NEWA website (http://newa.cornell.edu/) where this information is compiled from. Click on Pests Forecasts from the menu, select your weather station, and click on tomato diseases, set accumulation start date, and a table of daily and total DSVs will be generated.
Tomato Disease Forecasting Report
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.
Reports generated by Ryan Tirrell
Rutgers, The State University of New Jersey
August 5, 2016 A.Wyenandt, W.Kline, and J.Ingerson-Mahar
Potato | Tomato Disease Forecast 8-5-16
Click to View | Download Report 8-5-16
Potato Disease Forecasting Report
We will be tracking DSVs for Late blight development and calculating P-days for initiating the first early blight fungicide application.
The first late blight fungicide application is recommended once 18 DSVs accumulate from green row. Green row typically occurs around the first week in May in southern NJ. An early season application of a protectant fungicide such as mancozeb (Dithane, Manzate, Penncozeb) or Bravo (chlorothalonil) as soon as the field is accessible is suggested. Please be vigilant and keep a lookout for suspect late blight infections on young plants. No late blight has been reported in our region to date.
Remember the threshold for P-days is 300! Once 300 P-days is reached for your location, early blight fungicide applications should be initiated. Growers who are interested in using this model should choose the location above that is closest in proximity to their farming operation and should regularly check the Cornell NEWA website (http://newa.cornell.edu/) where this information is compiled from. Click on Pests Forecasts from the menu, select your weather station, and click on tomato diseases, set accumulation start date, and a table of daily and total DSVs will be generated.
Tomato Disease Forecasting Report
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.
Reports generated by Ryan Tirrell
Rutgers, The State University of New Jersey
August 4, 2016 Michael Westendorf
Livestock Auction Updates
Below are the latest livestock auction updates from the Hackettstown Livestock Auction. The Livestock Auction has a sale every Tuesday. This auction sells lambs, sheep, goats, calves, beef cattle, pigs, rabbits, and all types of heavy fowl. The auction begins at 10:30 am and ends with the last sale at 5:30 pm. This auction serves central and northern New Jersey as well as bordering areas of New York and Pennsylvania. (Market Report 8-2-16).
Michael Westendorf e-mail: michael.westendorf@rutgers.edu
August 4, 2016 Jim Murphy
Licensing for Mosquito Control – Category 8B
I have been getting questions from landscape/turf professionals about licensing for mosquito control. I asked Dr. George Hamilton about where to direct professionals with these questions.
Information on licensing of professionals for mosquito control can be found on the Rutgers Cooperative Extension Pest Management website: http://pestmanagement.rutgers.edu/PAT/
You can get a core manual and category 8B manual at your county extension office.
August 3, 2016 Kris Holmstrom and Joe Ingerson-Mahar
Veg IPM Update: Week Ending 8/03/16
Sweet Corn
European corn borer (ECB) adult activity is stable at very low levels Areas of highest activity are in central Morris County (see ECB map). As always, consider treating when the number of infested plants in a 50 plant sample exceeds 12%. Any planting remaining at or above threshold as it proceeds to full tassel should be treated, as this is the last stage at which ECB larvae will be exposed and vulnerable to insecticidal sprays. See the 2016 Commercial Vegetable Recommendations Guide for insecticide choices.
