EPA’s Recent Interim Registration Review Decision About Glyphosate (Prostko)

On January 22, 2020, the EPA released the following document:  Glyphosate – Interim Registration Review Decision – Case Number 0178.  A few excerpts that can be found in this document are as follows:

“The agency used the most current science policies and risk assessment methodologies to prepare a risk assessment in support of the registration reviews of glyphosate.”

“The agency concluded that there are no dietary risks of concern for any segment of the population, even with the most conservative assumptions applied in its assessments (e.g. tolerance-level residues, direct application to water, and 100% crop treated).”

“The agency also concluded that there are no residential, non-occupational bystander, aggregate, or occupational risks of concern.”

“The EPA concludes that the benefits outweigh the potential ecological risks when glyphosate is used according to label directions.”

“The EPA is requiring all glyphosate labels to be updated to modern standards.  The specific components of the label that require updates are as follows:  the maximum application parameters, environmental hazards statement for aquatic use, and clarification on rotational crop timing.  In addition, the agency is providing guidance to glyphosate registrants on acceptable marketing statements.” 

“The agency’s final registration review decision for glyphosate will be dependent upon an Endangered Species Assessment (ESA), an Endocrine Disruptor Screening Program (EDSP) determination, and a resolution of the Environmental Working Group (EWG) et al. petition (i.e. reduce the tolerance of glyphosate in or on oats from 30 ppm to 0.1 ppm and modify labels to explicitly prohibit pre-harvest use on oats).”

For a copy of the complete report, refer to the following web location:


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February 4, 2020 · 7:34 PM

2020 Peanut/Field Corn/Soybean Weed Control Recommendations

Below are Dr. Prostko’s recommendations for weed management this year:



Call the Thomas County Extension Office with any questions!

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2019 Extension Drift Survey Summary (Culpepper)

The figure below shares the results from 2014 through 2019. Impact through our Using Pesticides Wisely (UPW) program and county programs have been monumental with the overall goal of protecting pesticide users, by-standers, consumers, and our environment. Obviously, these results would not have been possible without a strong supportive and cooperative commitment among all of our Georgia agricultural family including growers, consultants, retailers/dealers, industry, and the Georgia Department of Agriculture.

In 2019, cotton, pecan, and fruits and vegetables (mostly gardens) received the most drift complaints at 38, 15, and 14%, respectively. Pesticides which led to the most extension drift visits included dicamba, 2,4-D, paraquat, 2,4-DB and cotton defoliation mixtures. For both dicamba and 2,4-D, complaints were significantly less in 2019 when compared to 2018.

No final decisions have been made on UPW 2020 as of Jan 7 but hopefully our plan will be in-place by mid-January with meetings planned for March 2020.

Posted by UGA Weed Science at Tuesday, January 07, 2020

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Hurricane Dorian

Related image

Photo Credit: New York Post

I thought I would share some information from Pam Knox about the hurricane and it’s potential impacts, she says; If you are feeling whiplash from all the media attention on Hurricane Dorian, you are not alone. Any potential for a big storm is going to bring out a lot of media attention, good and bad, and this certainly has the potential to be very bad. Here are a few of my thoughts while looking at all the content online.

  1. I love to look at spaghetti maps showing all the possible solutions for what “could be” the path of the storm. Of course you have to realize that most of them will never happen, but if you are someone who needs to know how bad it could be, the spaghetti models do tell you the envelope of possibilities. The important thing is not to focus on any one track but to look at both how they are scattered over time and space and how much they change from one set of runs to the next. Confidence grows when most of the models agree. Low confidence at the end of 5 days shows up as the wide “bulb” on the end of the cone from the National Hurricane Center, since at that point the center of Dorian could be almost anywhere in that circle.
  2. The timing of the storm hitting Florida (if it does) is going to be key to some of the impacts that will be seen. The slower the storm moves, the less certain we are about where it is going, because it is more subject to a variety of pushes from the atmospheric circulation and we don’t know which ones will be strongest. Another issue with slow storms is that they bring the wind and rain over the same area for a long time. I am sure the wind is bad enough, but for me the rain is worse because of the damage it can do on the ground. And of course the combination of wind and wet soil will push a lot of trees over, causing problems with power and roads, potentially for a long time if they are down over a wide area.
  3. Also, the slower the storm goes, the longer the impacts will be for somebody. If it slows way down, it may still be affecting areas along the East Coast for a week after landfall.
  4. Any time a storm hits the Florida peninsula, evacuations cause a lot of problems with traffic. Hurricane Matthew in 2017 followed a path right along the East Coast, driving waves of evacuees ahead of it filling up the interstates and using a lot of gas. Don’t be caught unprepared.
  5. Impacts from hurricanes can happen a long way outside the cone, it is still going to cause problems far away from the center. In particular, I think the Atlantic coast is going to be affected for quite a while by onshore flow around the storm. The onshore flow will also bring in plenty of moisture to form rain, and that can happen far ahead of the storm, so just because the storm is not near you it does not mean that you are not going to see impacts. One of the worst scenarios I saw today (from a single model, so hopefully not too likely to happen) was for the storm to amble slowly up the East Coast, dropping up to 20 inches of rain on the coastal plain of Georgia and South Carolina over the next ten days.

As for row crop farmers:  if you do experience damage to your crop contact your local crop insurance agent or FSA office as soon as you can.  Take pictures of damage, do not burn debris, and delay cleanup until it has been assessed by an FSA representative or crop insurance agent.  You must notify your crop insurance agent within 72 hours of a loss before abandoning the crop.  A declaration of loss must be written and signed within 15 days.  Also, track cleanup related expenses.  However, if there is a salvageable crop in the field, it should be picked, or this will county against your established yield.  We still have a lot of time before we know for certain how this will affect our area, and hopefully it doesn’t, but if you have questions about how to prepare feel free to call the Extension Office or access online resources. Be safe this weekend and coming week!

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Cotton and Peanut PGR’s


Cotton-Irrigation 007

Cotton planted in Thomas County is presently in several different growth stages, from just a few true leaves to bloom.  Growth has improved now that we have gotten some rain and temperatures have decreased. Now that our cotton is growing again we need to control vegetative growth in order for the plant to allocate resources toward the fruiting structures on the plant. Mepiquat is one tool that is specifically used to manage “rank” vegetative growth. This shortens the plant’s internodes, reduces leaf area, reduces carbohydrate stress, and contributes to earlier maturity. Some things to consider when applying PGR’s in cotton are: growth stage, growth rate, pest control, and anticipated growth based on field history and management practices. Low rate applications can be made during the second week of squaring in irrigated fields and apply on a 14 day interval up to 4 times. A more aggressive approach is to apply 8-12 oz. per acre at first bloom and make a second application two to three weeks later. In dryland cotton, applying 8 oz. per acre at first bloom and potentially follow with subsequent applications.

In peanuts, growth regulators are seldom used, but can be beneficial. Prohexadione calcium, or Apogee or Kudos, are the only growth regulators registered for peanut applications. Some positive results from using Apogee included reduced vine length. This allowed for increased efficiency during digging, however, there was no consistent yield increase. If you think that this may be helpful to you, 7.25 oz. per acre should be applied once 50% of lateral vines are touching and then applied again 2-3 weeks later. Timing of these applications is very important and should only be used on irrigated peanuts. Our peanut scientists are still researching the use of these products so more information will be available soon. Please contact me at the extension office with any questions.

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Rain in the Forcast

Image result for drought stressed cotton

Image from: Biochemical, Physiological and Molecular Avenues for Combating Abiotic Stress Tolerance in Plants. 2018: 297-316

Thomas County has not seen a significant rainfall event in the past 30 days.   Low humidity is also leading to high evapotranspiration.  Recently we have been losing up to .30 in. from evaporation each day.  All shallow soil moisture has basically been depleted at this point.  Shallow soil temperatures are also very high – 88 degrees yesterday.  Small tender plants are really suffering in this heat – the best solution for many growers is to irrigate at night (which is very difficult logistically because it takes up to 12 hours or more for a pivot to make a full rotation).  Cotton and peanuts are in the early stages of production so all that has mainly been affected is emergence – many have had to replant.  Those with irrigation systems can manage this issue, but those without need only pray for rain and manage weed and insect issues which have been made worse by the dry heat.  Weeds are more competitive in this environment and insects have moved off of other drought stressed plants onto more tender, newly emerged crops.  Good news – once cotton and peanut crops have emerged water demand is low (about a half in per week).  In an average year – we have no average years – this would be taken care of by rainfall.  By late June cotton and peanuts will be in peak water demand.  Approaching or in tasseling stage corn so yields are also being severely affected due to water requirements being about 2.5 in per week.  Pecans are also in need of irrigation with the onset of nut sizing coming up.   With temperatures up around 100 degrees for several days growers will be tempted to increase the irrigation further, but this is not necessary.  Pecan can still function normally at temps of 106 degrees as long as they have the water they need. Temperatures are much cooler at night though, which allows for some recovery for our crops.  Rain is also in the forecast for this weekend so hopefully we can all get some relief soon.  If not, good record-keeping and sound irrigation strategies can increase profitability in several different ways – reducing irrigation costs through reducing energy costs, and increasing yield.

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