Archives for July 2013

July 22, 2013

Potato Disease Forecasting Report 7-23-13

Potato Disease Forecasting Report 7-23-13 – 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
July 22, 2013

Kudzu bug in the Region

As predicted, the kudzu bug has appeared in our region.  The first specimens have been found by a private consultant in southern Delaware and other specimens have been found in Harford, Maryland, northeast of Baltimore.  Since its discovery in Georgia in 2009, the bug has rapidly spread across the southeastern US, now from Louisiana to Maryland and Delaware.  It is beneficial in that it feeds on kudzu and may actually help suppress it, but it also feeds on soybeans and other legumes, and, like the brown marmorated stinkbug, invades homes and structures in large numbers. We have no confirmed sightings in New Jersey, as far as known.  [Read more…]

Filed Under: Vegetable Crops
July 20, 2013

Vegetable Briefs – 7/20/13

  • Cucurbit downy mildew (CDM) has been reported on cucumber throughout the state.  All cucurbit growers should scout their fields on a regular basis and should add downy mildew specific fungicides to their regular maintenance program. CDM should be making the jump from cucumber to other cucurbit crops soon, if it hasn’t already done so. If you find CDM on cucurbits besides cucumber please let us know. Once plantings are done being harvested they should be disced under or hit with gramoxone immediately. To track cucurbit downy mildew in the US please visit http://cdm.ipmpipe.org/
  • Cucurbit powdery mildew (CPM)  This hot weather is ideal for cucurbit powdery mildew development. All growers should scout on a regular basis and continue with their regular maintenance programs. There are a number of fungicides available to control CPM. Please see the 2013 Commercial Vegetable Production Recommendations for more information. Organic cucurbit growers can apply OMRI-approved sulfur and other labeled products to help suppress CPM development.
Filed Under: Vegetable Crops Tagged With:
July 20, 2013

Late blight update – 7/20/13

There have been no new reports of late blight in New Jersey this past week. Late blight was reported in Northeast OH, Western NY and Lancaster, PA this past week. The extremely hot, dry weather this week throughout NJ has most likely reduced the immediate threat of late blight, but growers should remain cautious because the pathogen could reappear anytime weather conditions favor its development (There is a threat of rainfall everyday this coming week). [Read more…]

Filed Under: Vegetable Crops Tagged With:
July 18, 2013

Tomato Disease Forecasting Report 7-19-13

7-19-13 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
July 18, 2013

Potato Disease Forecasting Report 7-19-13

Potato Disease Forecasting Report 7-19-13 – 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