Remind: Some of my Remind messages have not been going through. Remind changed its policy and will only send messages through the Remind App; they no longer send text messages. To get Remind messages, you will have to download the Remind App. It’s free, and you can allow notifications, so any messages that I send will pop up on your phone like a text. I have looked for a replacement but have yet to find one. Below is a picture of the Remind App if you don’t already have it. If you have kids in school, you may have it; most teachers use it nowadays. Use this link if you would like to be added to the Tift Extension Remind messages: https://www.remind.com/join/justinhand
Cotton: With many bolls opening, let’s remember that water use rapidly declines as they start to open. UGA’s official irrigation termination recommendation for cotton is at an average of 10% open bolls across a field. When you consider the math, 10% open is not a high number of bolls on a plant that are open to start considering irrigation termination. A plant with 12 to 15 harvestable bolls means you need to be looking at the available soil moisture if 1.2 to 1.5 bolls are open. We don’t want to rot what’s there. Camp noticed a difference in Jassid-infested cotton and cotton that had been treated for Jassids while defoliating his trials this week. Typical symptoms associated with Jassids include the leaves turning yellow, followed by red, and then puckering. However, what I hope people have observed is that after the leaves turn red, as symptoms progress, those leaves will then go necrotic and die. This could be problematic when defoliating. It’s easier to knock off healthy leaves than dead ones; the live ones can easily take up the defoliant, while the dead ones like to stick. While Jassids may not directly impact the fiber once the cotton is open, there is a possibility that leaving cotton in the field during peanut harvest, a common practice, could lead to its impact. Plants will continue to deteriorate, which could result in higher levels of trash or leaf grades, and there is even potential for extraneous matter issues. The point of bringing attention to this is to stress the need for timely defoliation, particularly where jassids are an issue. The longer they feed and build on the cotton that is left undefoliated but is ready, I believe, there could be issues.
Defoliation: Here are some defoliation suggestions for the week. Just keep in mind that the forecast changes daily, so you may have to adjust accordingly.
- UGA 3-way
- Thidiazuron – lots of juvenile growth in the top of a lot of fields. I would be looking at 3-4 oz/acre. 4 oz for sure on cooler days (low 80s)
- Folex/DEF – 10 to 12 oz/acre, would probably consider 12 oz/acre on Monday or Tuesday, but 10 oz/acre is my go to rate for any situation.
- Ethephon – 32 to 42 oz/acre – 42 on Monday/Tuesday, can probably back off later in the week.
- * If you have morningglory issues, sub out the Folex for a PPO. These can be: ET (1.5oz) or ETX (1oz), Reviton (0.75oz), or Aim (0.75oz). All need an adjuvant.
Peanuts: Samples are rolling in. O6Gs and TifNV-HGs are still showing, for the most part, in the low to mid 140s. GA12Ys have shown closer to 155-160, but I have only seen a few samples of those. Still manage for leafspot. If you have fields that are eaten up with disease, let’s take a look and make a plan on what we need to do.