May 15, 2017

Potato | Tomato Disease Forecast 5-16-17

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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 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.

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.

Reports generated by Ryan Tirrell

Rutgers, The State University of New Jersey

Filed Under: Disease Forecasting Tagged With: ,
May 10, 2017

Veg IPM Update: Week Ending 5/10/17

Sweet Corn

Cold temperatures are slowing corn growth considerably.  The same weather is also delaying the onset of pests like the European corn borer (ECB).  No ECB were captured in blacklight traps this week.  As the population develops, look for maps to be published in the weekly IPM Update.

Cole Crops

Although cold weather and heavy rains have suppressed them, IPM personnel continue to observe infestations of crucifer flea beetle.  These beetles can build to high populations quickly, especially where wild mustard and related cruciferous weeds are common.  Extreme feeding on small transplants can cause irreversible damage if not controlled promptly. [Read more…]

Filed Under: Vegetable Crops Tagged With: ,
October 5, 2016

Veg IPM Update: Week Ending 10/05/16

Sweet Corn

16cew1005aCorn earworm moth (CEW) activity has been fairly steady over the past week.  Patches of locally higher activity remain within a generally low population (see CEW map).  Catches are now rising and falling with night time temperatures.  It is advisable to incorporate materials into the spray program that have different modes of action from the pyrethroids.  This includes IRAC 28 materials like Coragen, Exirel and Besiege, as well as IRAC 5 (Radiant, Entrust (OMRI approved), and Blackhawk)).  Growers should be checking CEW activity frequently, and adjust spray schedules according to local activity.  On this map, green areas correspond to a 3-4 day silk spray schedule, while blue is 4-5 days.

The highest nightly CEW catches for the previous week are as follows:

Centerton   3 Denville   1 Milford   1
Green Creek   2 Eldora   1 New Egypt   1
Blairstown   1 Farmingdale   1 Sergeantsville   1
Califon   1 Jones Island   1 Tabernacle   1

 

 

[Read more…]

Filed Under: Vegetable Crops Tagged With: , , , ,
September 28, 2016

Veg IPM Update: Week Ending 9/28/16

Sweet Corn

European corn borer (ECB) moths are nearly non-existent now.  There are no particular areas of higher activity, and  no map will appear in this edition. It is unlikely that we will realize any further injury from this pest this season.

Nearly all remaining sweet corn plantings are now in the silk stage.  Fall armyworm (FAW) however, continues to be a threat to these sweet corn plantings.  We should expect this pest to be with us at some level for the remainder of the sweet corn growing season.   FAW do not respond well to pyrethroid insecticides.  The most useful products are those in the IRAC group 28 class (Coragen, Exirel) or the IRAC group 5 class (Radiant, Entrust), or combination products including these classes.  See the 2016 Commercial Vegetable Recommendations Guide for insecticides effective against FAW.

  [Read more…]

Filed Under: Vegetable Crops Tagged With: , , , ,
September 21, 2016

Veg IPM Update: Week Ending 9/21/16

Sweet Corn

European corn borer (ECB) moth numbers have decreased this past week such that only a handful of moths were captured.  There are no particular areas of higher activity, and  no map will appear in this edition. It is unlikely that we will realize any further injury from this pest this season.

The highest nightly ECB catches for the previous week are as follows:

Cinnaminson   1 Milltown   1
Clinton   1 Pedricktown   1
Hillsborough   1 Sergeantsville   1

[Read more…]

Filed Under: Vegetable Crops Tagged With: , , , ,
September 14, 2016

Veg IPM Update: Week Ending 9/14/16

Sweet Corn

16ecb0914aEuropean corn borer (ECB) moth numbers increased slightly this past week.  At the present time, highest activity is in western areas from the Delaware Bay shore northward to Warren County (see ECB map). This partial third flight should not present much of a threat to host crops.  This is particularly true in light of the dominance this year of fall armyworm (FAW). FAW will probably remain the larger threat, and treatments for this pest will eliminate ECB in the process. See the 2016 Commercial Vegetable Recommendations Guide for insecticide choices.

 

 

The highest nightly ECB catches for the previous week are as follows:

Allentown   1 Lawrenceville   1
Crosswicks   1 Pennington   1
Downer   1 Phillipsburg   1
Georgetown   1  Sergeantsville   1

 

There has been little change in the fall armyworm (FAW) situation in the north and central areas.  Joe Ingerson-Mahar indicates that re-infestation rates in younger corn in the southern counties have declined somewhat.  Infestations continue throughout NJ, with damaging infestation rates in all parts of the state.  We should expect this pest to be with us for the remainder of the sweet corn growing season.  Treat when FAW alone or in combination with ECB damage exceeds 12% plants infested.  FAW do not respond well to pyrethroid insecticides.  The most useful products are those in the IRAC group 28 class (Coragen, Exirel) or the IRAC group 5 class (Radiant, Entrust), or combination products including these classes.  See the 2016 Commercial Vegetable Recommendations Guide for insecticides effective against FAW.

  [Read more…]

Filed Under: Vegetable Crops Tagged With: , , , ,