Archives for August 2013

August 30, 2013

Late Season Palmer Amaranth Management

A number of calls have come in about Palmer amaranth in soybeans and what can be done. First of all, if the plants have been sprayed with glyphosate and they did not die, then they are likely to be glyphosate-resistant and spraying more glyphosate will not kill them. Products like Pursuit or Reflex will not control Palmer amaranth plants larger than 5 to 6 inches. Options are limited to Gramoxone, handweeding, or mowing.

After corn harvest, some fields may need to be mowed or sprayed with Gramoxone to prevent late-season seed production.

Late-season management of Palmer amaranth to reduce or prevent seed production is not easy or convenient, but it will pay dividends in the future. Removing the plants prior to harvest will reduce the spread of the seed within the field and from field to field. If a single plant can produce 500,000 seeds; spread over an acre that is 10 seeds per square foot. You can quickly see how eliminating seed production and preventing the spread of seed with equipment is a tremendous help.

Filed Under: Commercial Ag Updates
August 29, 2013

Potato Disease Forecasting Report 8-30-13

Potato Disease Forecasting Report 8-30-13 – Click to Download

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.

Filed Under: Disease Forecasting
August 29, 2013

Tomato Disease Forecasting Report 8-30-13

8-30-13 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.

Filed Under: Disease Forecasting
August 28, 2013

Veg IPM Update: Week Ending 8/28/13

Vegetable IPM Report 8-21-13 – Click to View | Download | Print

Current Week’s Pest Maps – Available Maps for the week are highlighted

Filed Under: Vegetable Crops
August 27, 2013

Fruit IPM Report: Week Ending 8/31/13

Fruit IPM Report 8-31-13 – Click to View | Download | Print

In this report:

  • Peach
  • Apple
  • Pear
  • Grape
  • Scouting Calendar
  • Blueberry
  • Trap Counts
Filed Under: Blueberry, Fruit, Tree Fruit, Wine Grape
August 27, 2013

Potato Disease Forecasting Report 8-27-13

Potato Disease Forecasting Report 8-27-13 – Click to Download

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.

Filed Under: Disease Forecasting