Archives for May 2014

May 23, 2014

Controlling Emerged Palmer Amaranth in No-Till Burndown

I have observed a lot of emerged Palmer amaranth seedlings.

Early planted corn should be scouted at 4 weeks after planting to determine if a POST herbicide application is needed. A lot of no-till soybean fields need a burndown herbicide, and if Palmer amaranth is present in those fields, it makes things challenging. If the field was burned down earlier, and weeds have emerged since application, consider using Gramoxone (paraquat) to control emerged Palmer amaranth plants. Residual herbicides containing metribuzin or chlorimuron (unless the field has had history of poor control with ALS herbicides [Group 2]) will provide the greatest amount of help for burndown control of emerged Palmer amaranth in no-till soybean fields.

Filed Under: Commercial Ag Updates
May 22, 2014

Potato Disease Forecasting Report 5-23-14

Potato Disease Forecasting Report 5-23-14 – 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
May 22, 2014

Tomato Disease Forecasting Report 5-23-14

5-23-14 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
May 21, 2014

Invasive Emerald Ash Borer Detected in NJ

New Jersey Department of Agriculture today confirmed that the emerald ash borer (EAB), an invasive beetle that attacks and kills ash trees, has been found in Somerset County by a landscaper investigating unhealthy trees in a Bridgewater retail area last week. Inspectors sent insect larvae samples to the USDA where the specimens were confirmed.  [Read more…]

Filed Under: Landscape, Nursery, & Turf, Plant Diagnostic Lab Tagged With: ,
May 21, 2014

Veg IPM Update: Week Ending 5/21/14

Vegetable IPM Report 5-21-14 – Click to View | Download | Print

14ecb0521

Click Image to View

Maps for the Week
–Pepper Weevil Trap Catch Map
–European Corn Borer Population Map

Topics for the Week

  • Sweet Corn
  • Cole Crops
  • Peppers
  • Tomatoes
  • Pepper Weevil Report
  • BMSB

[Read more…]

Filed Under: Vegetable Crops
May 21, 2014

Yellow Sweet Corn

Sweet corn that has emerged has been observed yellow or light green in color. The chlorosis may be uniform, or appear mottled on the plant, or only the newest leaf growing out of the whorl is yellow. Cold weather is responsible for the injury. Corn cannot make chlorophyll when the temperature fails to climb above 65 to 70 degrees for an extended period. Herbicides are not responsible for the problem. Varietal differences to cold tolerance exist. The corn will turn green when the weather turns warm.

Filed Under: Vegetable Crops