Archives for August 2015

August 21, 2015

Potato | Tomato Disease Forecast 8-21-15

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Potato Disease Forecasting Report

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.

Tomato Disease Forecasting Report

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 19, 2015

Veg IPM Update: Week Ending 8/19/15

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Sweet Corn

European corn borer (ECB) adult activity has declined somewhat over the past week, with only scattered individuals outside of western Gloucester and Salem Counties (see ECB map). It remains to be seen whether we get another surge in moths as the summer winds down. As always, consider treating when the number of infested plants in a 50 plant sample exceeds 12%. Any planting remaining at or above threshold as it proceeds to full tassel should be treated, as this is the last stage at which ECB larvae will be exposed and vulnerable to insecticidal sprays.

See the 2015 Commercial Vegetable Recommendations Guide for insecticide choices.

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Filed Under: Vegetable Crops
August 19, 2015

Fruit IPM Report 8-18-2015

Peach

Oriental Fruit Moth (OFM): The third flight and all required treatment timings are now over throughout the state. Additional treatments will only be required on very late varieties, and only if trap counts exceed 6 moths per trap. We are seeing some high trap captures in some orchards.

Tufted Apple Budmoth (TABM): We are in the middle of the second flight, but pest pressure is very low. On most farms treatments are not needed. If you did have feeding injury from the first generation or have high trap counts, then you may wish to observe the following TABM timings.

Conventional, Diamides Conventional, Diamides Intrepid, Rimon Bt
County Area AM – 4 Middles EM – 2 Completes EM – 2 Completes EM – 3 Completes
Southern 1st – Past
2nd – Past
3rd – Past
4th – 8/17-18		 1st – Past
2nd – 8/13-16		 1st – Past
2nd – 8/13-16		 1st – Past
2nd – 8/10-13
3rd – 8/18-20
Northern 1st – Past
2nd – 8/15-16
3rd – 8/21-23
4th – 8/27-28		 1st – 8/10-11
2nd – 8/23-27		 1st – 8/13-16
2nd – 8/23-27		 1st – 8/13-16
2nd – 8/21-23
3rd – 9/1-3

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Filed Under: Blueberry, Fruit, Tree Fruit, Wine Grape
August 18, 2015

Beating the Bugs in the Bogs:
Insect Resistance in Different Cranberry Varieties

Insects are a major problem in cranberry production – they are estimated to reduce yield by 1-2% and without spraying, cranberry false blossom, a phytoplasma vectored by blunt-nosed leafhopper, would eliminate commercial cranberry production completely. Spraying chemical pesticides is the most common practice to combat pathogens and herbivorous insects, but beneficial insects, such as honeybees, important pollinators of cranberry, and natural enemies, such as predators and parasitoids, could be affected as well. Therefore, at the P.E. Marucci Center for Blueberry and Cranberry Research and Extension, we study the defensive mechanisms that cranberry plants themselves use against insect feeding. The research project of Dr. Elvira de Lange, a postdoc at the P.E. Marucci Center, focuses on four of the most problematic insects on cranberry in New Jersey: Sparganothis fruitworm, spotted fireworm, gypsy moth and the above-mentioned blunt-nosed leafhopper.

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Filed Under: Cranberry, Fruit
August 17, 2015

Potato | Tomato Disease Forecast 8-18-15

Click to View | Download Report 8-18-15

Potato Disease Forecasting Report

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.

Tomato Disease Forecasting Report

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 14, 2015

Late Blight Found on Tomato: Sussex County – 8/14/15

Late blight has been found in a small tomato planting near Layton in Sussex County.

This is the second report this growing season in New Jersey and the first since early July. All tomato growers should scout their fields on a regular basis. The incoming hot, dry weather should help reduce any potential threat from late blight.

Filed Under: Vegetable Crops