Appling County Crop E News

2017 Pecan Spray Guide

 

2017-Pecan-Spray-Guide Click here

 

The optimum temperature range for scab infection is 59-77 degrees F and a leaf wetness of about 12 hours.

Pecan spray suggestion guide from 2016:

1. Absolute

2. Tebuconazole+Topsin M+Phosphite

3. Absolute+Phosphite

4. Elast/Tin

5. Absolute

6. Elast/Tin

7. Elast/Tin

8. Elast/Tin

If rainfall during the growing season is excessive, more than 8 sprays will be required for management of scab on susceptible cultivars, therefore, the following program serves as an example of how to accommodate this need.

1. Absolute

2. Tebuconazole+Topsin M+Phosphite

3. Absolute+Phosphite

4. Elast/Tin

5. Absolute

6. Elast/Tin

7. Elast/Tin

8. Quadris Top

9. Elast/Tin

10. Elast/Tin

 

Pre Emergent Herbicides

Most all growers will be applying a herbicide soon. How can you keep the herbicide strip weed free and limit the number of applications needed?

  1. Include pre-emergent herbicides in your program. Alion is an excellent pre-emergence material that gives long lasting control. It has a high price tag but it will significantly cut down on the number of applications you need to make. Use the 5 oz/A rate in the first year that you use Alion. After that, you can drop down to the 3.5 oz/A rate. Alion is labeled for trees 3 yrs of age or older. However, that label will likely soon be changed and this material would then be labeled on 1st year trees and older. UGA has tested it for a number of years on 1st year trees at high rates and have never seen a problem.
  2. Flumioxazin (Chateau) is also an excellent pre-emergence herbicide for use on trees from the 1st year on up. It doesn’t last as long as Alion, but it’s still a good choice. Rotation between Alion and Flumioxazin from one year to the next is a good idea to manage resistance and limit the over-use and buildup of indaziflam (Alion) in the orchard.
  3. There are many other options for pre-emergence which can be utilized in pecan orchards. These include Surflan, Simazine, Prowl, and Diuron. Isoxaben (Trellis) and rimsulfuron (Metric, Solida, and Pruvin) are recent additions to this arsenal. Of these, Surflan, Prowl, Isoxaben and Rimsulfuron can be used on 1st year trees and up. Trees must be 2 yrs old for Simazine and 3 years old for Diuron. Also, do not use Diuron on sandy soils.
  4. Tank mixing burndown and pre-emergent herbicides will reduce the number of trips made over the orchard, but be sure to have at least 75-80% bare ground when using a pre-emergence material. Most of them need good soil contact to be effective.