Cucurbit downy mildew was confirmed on pumpkin near Bridgeton in Cumberland County, New Jersey on 7/31/18. This is the fourth report of CDM in New Jersey this growing season. All cucurbit growers are encouraged to add downy mildew specific fungicides to their weekly maintenance spray programs. The 2018 FRAC Table for Cucurbit Downy and Powdery Mildew Control in the mid-Atlantic Region can be found and downloaded for FREE here. All growers should scout fields on a regular basis. To track the progress of cucurbit downy mildew in the US through the CDMpipe website through NCSU please click here.
Archives for July 2018
Potato | Tomato Disease Forecast 7-31-18
Click to View | Download Report 7-31-18
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 NJ. An early season application of a protectant fungicide such as mancozeb (Dithane, Manzate, Penncozeb) or Bravo (chlorothalonil) as soon as the field is accessible is suggested. Please be vigilant and keep a lookout 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 choose 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.
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.
Reports generated by Ryan Tirrell
Rutgers, The State University of New Jersey
Potato | Tomato Disease Forecast 7-27-18
Click to View | Download Report 7-27-18
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 NJ. An early season application of a protectant fungicide such as mancozeb (Dithane, Manzate, Penncozeb) or Bravo (chlorothalonil) as soon as the field is accessible is suggested. Please be vigilant and keep a lookout 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 choose 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.
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.
Reports generated by Ryan Tirrell
Rutgers, The State University of New Jersey
Fruit IPM for 7/27/18
Peach:
Oriental Fruit Moth (OFM): Third flight adults are present in southern counties and starting to emerge in northern counties. The timing for 3rd generation treatments is now statewide. Treatments should be finishing up in southern counties and just starting in northern counties.
Cucurbit Downy Mildew ALERT – 7/25/18
Cucurbit downy mildew was confirmed on butternut squash near Bridgeton in Cumberland County, New Jersey on 7/25/18. This is the third report of CDM in New Jersey this growing season. All cucurbit growers are encouraged to add downy mildew specific fungicides to their weekly maintenance spray programs. The 2018 FRAC Table for Cucurbit Downy and Powdery Mildew Control in the mid-Atlantic Region can be found and downloaded for FREE here. All growers should scout fields on a regular basis. To track the progress of cucurbit downy mildew in the US through the CDMpipe website through NCSU please click here.
IPM Update 7/25/18
Sweet Corn
European corn borer (ECB) moth catches in black light traps, after showing signs of increase, have now largely subsided again. The second flight is most likely going to be spotty, with specific locations getting low numbers of moths while other regional traps catch none. There will be no map in this edition. While we expect to see some feeding signs over the next two weeks, this second generation feeding is sometimes obscured by fall armyworm (FAW) feeding. Once plants hit full tassel, any ECB larvae present will move downward on the stalk and re-enter the plant near the area where ears are forming. This can result in direct injury to the ear. Growers should consider an insecticide application at the full tassel stage to target ECB larvae as they migrate downward. This application can eliminate larvae that have escaped any earlier insecticide applications. [Read more…]