Rutgers University | New Jersey Agricultural Experiment Station | Pesticide User Responsibility

Archives for July 2016

July 7, 2016

Sparganothis Fruitworm Degree-Day Update: as of July 6, 2016

As of July 6, Sparganothis has accumulated 1,175 DD. Based on the DD model, Sparganothis has passed peak flight, and is laying eggs. Reminder that a single insecticide application, i.e., post-bloom application with Delegate, Altacor, Diazinon, or Intrepid, aimed at Sparganothis larvae will likely have the greatest effect if it is timed for peak egg-hatch/larval-emergence, which is approximately 1,400 DD and should coincide with early next week. I will keep you updated on these predictions as the season progresses.

Life history benchmarks for Sparganothis fruitworm and associated degree-day estimates (credit: Elissa Chasen and Shawn Steffan, USDA-ARS and UW Entomology).

Life history benchmarks for Sparganothis fruitworm and associated degree-day estimates (credit: Elissa Chasen and Shawn Steffan, USDA-ARS and UW Entomology).

 

Filed Under: Cranberry, Fruit
July 6, 2016

Veg IPM Update: Week Ending 7/06/16

Sweet Corn  16ecb0706a

European corn borer (ECB) moth catches remain very low now.  Only scattered individuals are now being captured, and growers are managing residual infestations.  At the present, the highest adult activity is in Salem county, although it is quite low even there (see ECB map).  Larval feeding ranges from single digits to above 20% in areas where IPM personnel are operating.  Be sure to begin monitoring plantings for ECB feeding while they are still in the whorl stage.  Consider treating when the number of infested plants in a 50 plant sample exceeds 12%.  [Read more…]

Filed Under: Vegetable Crops
July 6, 2016

Fruit IPM for 7-5-2016

Time to start applications for second generation codling moth in apples. Protect ripening peaches from brown rot. Spotted wing drosophila still a problem. View the full update for 7-5-2016.

Filed Under: Fruit, Tree Fruit
July 5, 2016

Dickeya dianthicola affecting potato growers throughout Mid-Atlantic region and elsewhere – Updated 7/11/16

In addition to Dickeya dianthicola being found in ‘Superior’, ‘Reba’, ‘Snowden’, and ‘Norwis’ on 3 farms in New Jersey this year, the pathogen has also been detected in fields with seed originating from Maine on 5 farms on Long Island in ‘Reba’, ‘Vivialdi’, ‘Superior’, ‘Norwis’, and ‘Waneta’. Other varieties such as ‘Yukon Gold’ have also tested positive for Dickeya. The pathogen has been detected in MA, DE, PA, MD, VA, NC, WV, and FL this summer on seed from Maine and New Brunswick, Canada (NJ and VA). Maine potatoes are currently shipped to over 20 states across the country (CA, CT, DE, FL, ID, IN, KY, MD, MA, MS, NH, NJ, NY, NC, OH, PA, RI, TN, VT, VA, WA, WV, and WI). Potato growers, crop consultants, and Extension personnel in states which grow Maine potatoes should remain vigilant by scouting their fields for Dickeya symptoms on a regular basis and by submitting any suspect samples for diagnostic testing. Dickeya dianthicola has been detected in the US in the past, and because of this, APHIS just recently announced that the pathogen has been designated as a non-reportable/non-actionable pathogen despite its potential to cause 100% crop loss. A link to the USDA/APHIS website for information on Dickeya dianthicola detection and control can be found here.

For more information on Dickeya please see the following articles posted online – source(s) of information:

Blackleg is Once Again Being Observed in Potato Fields Across the Mid-Atlantic Region – Penn State University

Update on Dickeya detections in potato – University of Delaware

Dickeya Blackleg: New potato disease causing major impact. – Cornell University

Watch for Dickeya – a new potato disease – The Ohio State University

High security Aroostook farm advances tater technology. – Maine Potato Board

Slowing Dickeya, other pathogens in Canada. – North Dakota State University

Dickeya: A new threat to potato production in North America. – SPUDsmart

Dickeya is coming. – University of Wisconsin/North Dakota State University

Maine ‘Ground Zero’ for new potato disease. – Maine Department of Ag.

Maine seed potato growers looking to protect brand against disease. Maine Department of Ag./Maine Potato Board

Filed Under: Vegetable Crops Tagged With: ,
July 4, 2016

Potato | Tomato Disease Forecast 7-5-16

Click to View | Download Report 7-5-16

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 the field is accessible is suggested. Please be vigilant and keep a look out 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 chose 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

Filed Under: Disease Forecasting