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

Archives for August 2015

August 31, 2015

Audit Ready: Sanitizing Surfaces in Post Harvest

sanitation product contact surfacesSanitizing product contact surfaces is important in reducing cross contamination risks.  “Product contact surfaces” means anything that comes in contact with the product such as equipment, belts, rollers, brushes, tables, bins, sinks, tools, and reusable totes.  Writing a standard operating procedure describing the specific steps of your cleaning process will help ensure that the surfaces are properly cleaned.

Proper cleaning and sanitizing of contact surfaces includes these steps:

  1. Surface is rinsed to remove any visible debris
  2. Appropriate detergent is applied and the surface is scrubbed
  3. The surface is rinsed with water that is potable (drinkable)
  4. Appropriate sanitizer is applied, following the directions
  5. Let the surface air dry

An appropriate sanitizer for use in post harvest surface cleaning is one that has an EPA registration number, states that it is food grade, and gives specific instructions for the products use as a surface cleaner.  Remember the label is the law.

Filed Under: Blueberry, Food Safety, Fruit, Tree Fruit, Vegetable Crops
August 28, 2015

Potato | Tomato Disease Forecast 8-29-15

Click to View | Download Report 8-29-15

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 New Jersey. 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.

Filed Under: Disease Forecasting
August 28, 2015

Vegetable Disease Briefs – 8/28/15

  • Downy mildew remains active on all cucurbit crops. All cucurbit growers should include downy as well as powdery mildew specific fungicides in their weekly maintenance sprays. Please remember different modes-of-Action (i.e., FRAC groups) to help manage fungicide resistance develop in both pathogens. To track the progress of CDM in the US please visit http://cdm.ipmpipe.org/
  • There have been no new reports of late blight in New Jersey since 8/14. Remember as fall approaches and night temperatures become cooler and light fogs begin to develop conditions for late blight development improve. All abandoned tomato blocks/fields need to be disked under as soon as harvesting is done or sprayed with gramoxone to kill all living foliage. To track late blight in the US please visit http://usablight.org/
  • Bacterial leaf spot remains active on pepper and tomato crops. Bacterial canker on tomato has also been reported.
  • Pepper anthracnose has been reported. All pepper blocks/fields where anthracnose is present and harvesting is completed need to disked under and/or sprayed with gramoxone as soon as possible. Infected plant material left in the field will only serve as a source of inoculum for further spread of the disease.
Filed Under: Vegetable Crops
August 26, 2015

Fruit IPM Report 8-26-2015

Peach

Oriental Fruit Moth (OFM): A fourth flight is now being seen as trap captures start to increase (in apples). Since most peaches are off, this is not a concern in most blocks. However if you have very late varieties, especially if close to apple plantings, then treatments are needed.

Tufted Apple Budmoth (TABM): All treatment timings are over for this pest statewide. The only exceptions would be in northern counties where there may be visible injury, and growers want to continue the use of B.t. products.
[Read more…]

Filed Under: Blueberry, Fruit, Tree Fruit, Wine Grape
August 26, 2015

Veg IPM Update: Week Ending 8/26/15

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Sweet Corn

European corn borer (ECB) adult catches have become somewhat more consistent in southern NJ over the past week, but with very few individuals captured north of Burlington County (see ECB map). This late summer flight appears to be a fairly week one. 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 2015 Commercial Vegetable Recommendations Guide for insecticide choices.

[Read more…]

Filed Under: Vegetable Crops
August 25, 2015

Potato | Tomato Disease Forecast 8-25-15

Click to View | Download Report 8-25-15

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 New Jersey. 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.

Filed Under: Disease Forecasting