Rutgers Cooperative Extension
David Holshouser
VT
Increasing Double-Cropped Soybean Yield
http://www.plantmanagementnetwork.org/edcenter/seminars/soybean/DoubleCropped/
This 20-minute webcast is open access. Viewers can also opt to see a 5-minute executive summary version. This shorter executive summary version is permanently open access courtesy of the United Soybean Board. [Read more…]
Potato Disease Forecasting Report 6-18-13 – 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.
Bloom has started. If insects have been effectively managed prior to bloom, we recommend no sprays at this time. A reminder: when bees are present your only choices of insecticides are the Insect Growth Regulators –IGR- (e.g. Confirm and Intrepid) or Bt products (e.g. DiPel).
From now until August, we recommend monitoring insect populations using pheromone traps. [Read more…]
In 2012 we started a study to compare the efficacy of different trap designs (delta versus wing traps) and colors (white versus red) on Sparganothis fruitworm (SPARG) adult captures. We found that red delta traps (Trécé Pherocon VI) are more effective than white delta traps. White delta traps also catch greater number of honey bees, and it is possible that this saturates the sticky traps. We are continuing this work and testing this hypothesis in 2013. Results from these studies will be presented at future grower meetings.
Experiment set-up to test effect of
trap design and color on
Sparganothis fruitworm captures.
Data show red delta traps to be more effective than white delta traps in catching adult Sparanothis fruitworm.
Below is a list of where to get supplies for IPM programming. I have put together the following list for those of you who wish to purchase supplies. This is not an endorsement of any particular company. Some vendors are manufacturers, and sell direct, while others are only retailers.
Distributors, Dealers, Manufacturers
Nitrogen Deficiency in Corn
Many corn fields have been repeatedly saturated by recent successive rainfalls. Numerous fields, particularly no-till fields, are yellowing.
While this could be due to several factors, one may be the lack or loss of Nitrogen. On sandy soils, N has probably leached below the root zone and on heavier textured soils some may have also leached but more than likely some denitrification has occurred where N is lost to the atmosphere.
Regardless, some supplemental N applications may be necessary. Sidedressing N is the best option but soils are so wet that it may be a week or so before growers can get in. In other cases, growers may not have such equipment. Fertilizer suppliers may have equipment to apply such products as UAN solutions or Urea(preferably with a urease inhibitor if not incorporated). If surface applied, N losses can occur if rain doesnot follow application within a day or two.
How much N to apply is also a question. If a good amount of N was applied before or at planting then 50 lbs/A of actual N is probably appropriate. If growers put little or no N down in hopes of sidedressing, then a good portion of their planned amounts will be needed.
The ideal time to apply sidedress N is between corn stage V6 and V8 (12-18 inches tall). If the growers have early and late planted corn that is yellow, then the early planted, taller fields should be fertilized first.
