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Fungicide Schedule and Pecan Tariffs

I have had many requests to provide a pecan fungicide schedule example for 2018. Not much has changed from previous years with the exception of the use of phosphite alone in one of the early sprays. I list it here for spray number 2 but it should work for spray 3 or possibly number 4 as well, depending on how soon you get to spray 4. Basically use it on one of the pre-pollination sprays.

We have had some rain this week but there is till very little tissue out and temperatures remain relatively cool. I have heard of a number of folks spraying already. I still feel its a little early but growers with Desirable or Pawnee in high pressure areas should consider spraying soon. Bear in mind that scab grows within a range of 50-95 degrees but 59-77 is the optimum range.

Fungicide Schedule Example follows:

Moderately susceptible cultivars or those under less scab pressure

1. Absolute

2. Phosphite–2 qt/acre rate*

3. Absolute

4. Elast/Tin

5. Absolute

6. Elast/Tin

7. Elast/Tin

8. Elast/Tin

*Check mixing compatibility of your phosphite and foliar zinc (or other foliar nutrient) choices prior to application. Some phosphite and zinc products do not mix well.

Heavy Scab Pressure (Desirable, Pawnee)

1. Absolute

2. Phosphite–-2 qts/acre

3. DMI Fungicide (Tebuconazole or Propiconaole, etc.) + Tin

4. Absolute+Phosphite @1 qt/acre

5. Elast/Tin

5. Absolute

6. Elast/Tin

7. Elast/Tin

8. Quadris Top

9. Elast/Tin

10. Elast/Tin

11. Absolute

12. Elast/Tin

Do what is necessary to protect  your crop from scab this year but don’t do more than you have to do. Everyone has likely heard by now of the increased tariff applied to U.S. pecans going to China (up an additional 15% now  to 22%). I have long said that the China market looked to be good for us barring any political problems and it looks like we now have one. However, its too early yet to tell if or how much this will affect our market. We have a long way to go until harvest and hopefully the trade issues between the U.S. and China can be resolved by then. Even if they are not, the tariff for pecans going to China was 24% as recently as 2014/2015 and the market remained strong. The other tree nuts have been hit with their additional 15% as well.

So, what does this mean for your management? I think its wise to watch profit margins closely regardless of the price of pecans but since we don’t yet know the impact the trade issues will have on the pecan market, I feel its even more important to spray as you need to but spray only when necessary. The same goes for all aspects of management. Give the trees what they need but don’t engage in luxury spending for practices, products, or applications you may not necessarily need.

Lorsban in Sweet Potatoes

Lorsban 24C Label for 60 Day PHI in Sweet Potato


While it has taken several years, Georgia does now have a 24C registration to allow for the use of Lorsban in Sweet Potato with a 60 day pre-harvest interval (PHI).

Lorsban is still labeled for pre-plant incorporated application only.

Do Pepper Weevil Overwinter in South Georgia

Do Pepper Weevil Overwinter in South Georgia?  Dr.  Sparks answers the question.

The answer to this has always assumed to be no, but that has apparently changed. Will they survive long enough to infest the spring plantings at an economical level remains to be seen, but I would not bet against them at this point.

In the past two months we have surveyed some fields old pepper fields and continue to find live pepper weevil adults. We started by collecting old pods (but still solid) in a couple of fields that had jalapeno pepper in the fall. These had been mowed, but pods which had not disintegrated were scattered throughout the field. We dissected pods and never found any grubs, but we did collect adults on the outside of these pods. I believe that these old pods are providing a food source for adults, thus allowing them to live for several months (instead of a few weeks without food).

We then placed pheromone traps in a couple of fields. These are baited with both the weevil pheromone and a plant extract. These baits have not performed well historically (when tested in standing pepper fields), but we have caught adult weevils consistently with these traps in the last few weeks.

Bottom line is that we did appear to overwinter adult pepper weevil in South Georgia. With this fact, I would suggest treating early pepper fields for weevils at the first sign of any buds in the field. Weevils will feed on foliage, but this damage is insignificant. They require a fruiting structure to reproduce. Thus, let the plants attract the weevils into the field until the plants are getting ready to set fruit and then eliminate the weevils prior to reproduction. Hopefully this will start us off clean and prevent the problems we saw last fall.

A final reminder – last year the pyrethroid insecticides were not controlling pepper weevil in Georgia. Products which have shown good efficacy include oxamyl (Vydate and others), Assail and to a lesser extent, Exirel.



The UGA Heifer Evaluation and Reproductive Development  (HERD)  Sale will be on Tuesday April 17 at 12:30 p.m. at the Tifton Bull Evaluation center  near Irwinville.  This is and excellent excellent opportunity to purchase quality replacement females.

Weed control questions

Dr. Prostko shared some questions received over the last few days:

 1.) How do I control ryegrass prior to planting peanuts if I suspect that I might have glyphosate resistance?

Select 2EC @ 8 oz/A or Select Max 0.97EC @ 16 oz/A (or generic equivalents) + 1% v/v COC  would be a good choice for this problem.  Remember that ryegrass stage of growth is important (Figure 1) and that temperatures below 50 F can significantly reduce control.  Higher rates of paraquat (3.5-4.0 pts of 2 lb ai/gal) can also be effective but 2 applications (10-14 days apart) may be needed.    

Figure 1.  Influence of clethodim timing on ryegrass control.  

2) What is the best nozzle to use for soil applied residual herbicides?

Generally, nozzle type is not as critical with soil applied residual herbicides when compared to postemergence herbicides.  For many years, I used a flat fan nozzle (11002DG) for all my weed control trials.  Recently, I started using an AIXR11002 nozzle as my standard.  I have also applied soil residuals with a TTI-02 nozzle.  I have not observed any reductions in the performance of residual herbicides when using these larger droplet nozzles.  Check out Figure 2 for a quick look at the coverage provided by these different nozzle types.  However, I would suggest that growers refer to the nozzle manufacturer for more specific information about the potential performance of nozzles with soil residual herbicides.

Figure 2.  Spray Coverage with Various Nozzle Tips

3)  What is ACURON herbicide?
Acuron, from Syngenta, is a mixture of s-metolachlor + atrazine + mesotrione + bycyclopyrone registered for use in field corn, seed corn, silage corn, sweet corn, and yellow popcorn.  Acuron can be applied preemergence or postemergence depending upon the type of corn.  I have tested Acuron for a number of years and it is a very good product.  It would be especially useful to growers who are dealing with glyphosate, atrazine, and/or ALS resistant weeds.  But in the absence of resistance, it’s very difficult to for most higher priced new herbicides to beat the cost-effectiveness of a timely postemergence application of glyphosate + atrazine + Prowl tank-mixture in Georgia.   I do not have an exact figure but I have heard that Acuron is a bit pricey?
4) What is SHIELDEX herbicide?  
Shieldex, from Summit Agro USA, contains the active ingredient topyralate.  Shieldex is labeled for postemergence use in field corn, sweet corn, and popcorn.  Shieldex has the same mode of action as several other corn herbicides such as Callisto (mesotrione), Impact (topramezone), and Laudis (tembotrione).  All of these herbicides are HPPD inhibitors (WSSA MOA #27).  There are 2 good reasons why Georgia corn farmers need not worry about this herbicide:  1) it is not yet labeled in GA; and 2) I only have 1 field trial with this product (i.e. not enough data to make a solid recommendation).

Peanut tillage trials

2016 2017
Chisel Plow 6033.2 b 7489.9 b
Rip and bed 6207.1 ab 7552.9 b
Bottom Plow 6422.8 a 7782.2 a

The following is the impact of tillage on yield potential. Tillage trials were conducted at  the Midville station the last two years. This information was provided by Dr. Scott Monfort UGA peanut specialist.

South Georgia North Florida Forage meeting

March 7, 2018

Hello everyone,

A South Georgia and North Florida Forage and Livestock Production Meeting is scheduled March 22, 2018 at 7:00 p.m. in Lake Park, Georgia at the 4-H Camp 6100 4-H Club Road, Lake Park Georgia 31632.

Ann Blount and Cheryl Mackowiak with University of Florida will be presenting the program on Foraging ahead: The 2018 Southern Forage Update. Also, Ashley Tye, GA PCEM Director Lowndes County EMA is presenting the Livestock Evacuation issues for Lowndes County.

This meeting is sponsored by Nashville Tractor and a meal will be provided. Please call (229) 333-5185 by March 21, 2018 to R.S.V.P.

Andy Carter
County ANR Agent
Cell 229-415-6163