Cotton Defoliant Update
Dr. Camp Hand:
“The story of the next couple of weeks is cooler temperatures. For the most part, highs in the 70s and lows in the 50s for the next 10 to 14 days; some of our defoliants will not work as well so we may need to use some different rates or products.
We are now to the point where I would start pulling out Ginstar (diuron + thidiazuron). The added diuron helps in cooler temperatures. Rates that I would consider using with the conditions that we are looking at would be between 6 to 8 oz/acre. Prep needs to be in the tank with this. For the most part, people are already using prep rates that are justified for cooler weather, but you can use up to 42 oz/acre in a single application. The reason that I would start using a Ginstar type product at this point is because thidiazuron alone begins to see less activity once temperatures (particularly night temps) get below 65. With the amount of regrowth I have seen just driving down the road we need all the help we can get, and that is why I think Ginstar would be a good choice. If you decide to use Ginstar, you should only need Ginstar + Prep in the tank. Some may want to use a low rate of Folex which is fine, but I have seen excellent activity with Ginstar + Prep alone.
Although the standard three way mixture can still be used, it needs to be adjusted. With the current temps we are looking at, Folex rates need to be around 12 to 16 oz/acre. As mentioned earlier, thidiazuron loses efficacy when nighttime temps are below 65, and if you refer to the cotton production guide or pest management handbook, the recommendation is to take it out of the mix. TDZ rates could be increased in an attempt to regain some activity, but in my opinion the Ginstar option is the better route to go. Prep rates should remain around 40 to 42 oz/acre.
I spoke about this briefly during my defoliation update this year, but for those that like to play chemist and mix up their own Ginstar, here is the formula: 8 oz Ginstar = 2 oz TDZ + 1 oz Diuron.”
Current Corn Disease Watch
Dr. Bob Kemerait:
“Any green corn left, could have tar spot, a new disease in this area easily identified by presence of small, black, raised, pepper-grain-sized specks on the leaf. Could be one or two alecks, could be hundreds. We are trying to document distribution.”
– Let me know, Josh (229-417-7062) I’d love to come out and scout for it.
Tar Spot on Corn – Grady Co, 2021 – Cale Yarborough
Grain/Forage Variety List – UGA Recommended
“Dr. Mailhot sent out the new UGA Recommended small grain variety list yesterday so I wanted to share it with you. It has wheat and other grains plus recommended forage varieties as well, with a separate sheet for ryegrass. Screenshots are below and also pdf file attached with same info.”
“Also, we’ve done some revision and updating to the Wheat Top 10, 4 page fact sheet for high yield Wheat production. Use link below to access.”
Asian Longhorned Tick Webinar
For Cattlemen and anyone concerned about ticks.
Dr. Nancy Hinkle:
“UGA is presenting a webinar on Thursday, Oct. 28th, at 2 p.m. to update us about the invasive Asian Longhorned Tick, which was first confirmed in Georgia last month.”
Meeting ID: 952 7819 0391Passcode: 268318 .
Asian Longhorned Tick – CDC
Pest Manger Webinars – Earn CEU Credits
- Home Pest Control Webinar – Roach Control
Learn while you earn 2 GA HPC and 2 GA, SC or TN Commercial Pesticide Applicator Credits on your computer or smartphone!
Thu, October 21, 2021
3:00 PM – 5:00 PM EDT
- Pest Manger Webinar – Annual Bluegrass Control & Winter Landscape Pests
Learn while you earn GA, SC, and TN pesticide applicator plus ISA & SAF credit on your computer or smartphone!
Thu, November 11, 2021
3:00 PM – 5:00 PM EST