Archives for June 2013

June 11, 2013

Tomato Disease Forecasting Report 6-11-13

6-11-13 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
June 10, 2013

On-Farm Research Results in Cranberry: Altacor

Rutgers Technician Robert Holdcraft sweeping a cranberry bed.

Rutgers Technician Robert Holdcraft
sweeping a cranberry bed.

Altacor is a new insecticide registered in cranberries. A few weeks ago we conducted an experiment to test the efficacy of Altacor® (DuPont) at 4.5 oz/acre against spotted fireworm larvae.
[Read more…]

Filed Under: Cranberry, Fruit
June 7, 2013

2013 Cucurbit Downy and Powdery Mildew Management Guidelines

by Margaret McGrath, Beth Gugino, Kate Everts, Steve Rideout, Nathan Kleczewski, and Andy Wyenandt

2013 Fungicide Resistance Management Table for Cucurbit Downy and Powdery Mildew Control

Producing a high-quality cucurbit crop necessitates effectively managing downy mildew.  This foliar disease is common in the mid-Atlantic and northeast because the pathogen produces a large quantity of asexual spores that are easily dispersed long distances by wind, which enables it to spread widely.  Although the pathogen cannot survive between growing seasons where winter temperatures kill cucurbit crops, it moves throughout the eastern USA each year via its asexual spores. The pathogen does not affect fruit directly; however, affected leaves die prematurely which results in fewer fruit and/or fruit of low quality (poor flavor, sunscald, poor storability). [Read more…]

Filed Under: Vegetable Crops
June 7, 2013

Vegetable Briefs and Disease of the Week

  • Cucurbit downy mildew was reported as far north in Wayne and Nash Counties in North Carolina and Texas this past week. All cucurbit growers are urged to begin scouting. To track cucurbit downy mildew in the US please visit http://cdm.ipmpipe.org/
  • No late blight has been reported in the region to date and has only been found as far north as central Florida to-date. To track late blight in the US please visit http://usablight.org/
  • Want more information on what’s going on, please sign up for the Jersey Vegetable Crop Ag Updates at: http://jerseyvegcropsagupdates.blogspot.com/.
  • An update and results from Penn State University on the strawberry virus survey they conducted this spring can be found here.

Vegetable Disease of the Week

Cucurbit downy mildew of cucumber

 

Filed Under: Vegetable Crops Tagged With:
June 7, 2013

Tomato Disease Forecasting Report 6-7-13

6-7-13 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
June 7, 2013

Potato Disease Forecasting Report 6-7-13

Potato Disease Forecasting Report 6-7-13 – 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