Clemson Peanut Specialist, Dan Anco, recently prepared these statements for peanut growers.
Propiconazole and Phosphorus Acid: As we all know, US-grown peanuts are sold both domestically and internationally. Both markets are very important. With regulations and concerns in some export destinations (the European Union) as they are, peanuts that have detectable amounts (up to certain levels) of some chemicals will not be allowed (propiconazole and phosphorous acid-based products).
Below is a list of products and their manufacturers that should not be applied to peanuts. Several buying points may be up front about this when providing contracts, but any peanuts that are planned to be brought to any buying points (including those not on contracts) should similarly not use these products to be on the safe side.
Peanuts being sold as fresh green peanuts locally are not falling under the same concern if the above products are used according to their labels.
Replacement options for Tilt Bravo that do not have propiconazole include:
- 1 pt/A Bravo + 5.5 fl oz/A Alto
- 1 pt/A Bravo + 7.2 fl oz/A Eminent (leafspot only)
- 1 pt/A Bravo + Topsin at 5 to 10 fl oz/A
- 1 pt/A Bravo + Topguard at 7 to 14 fl oz/A
- 6 fl oz/A Priaxor at 40 DAP to replace 2 early season sprays (to replace the 30 and 45 DAP sprays)
Replacement options for phosphorous acid-based products for managing Pythium pod rot include:
- Mefenoxam (this is in seed treatments like Dynasty)
Imidacloprid vs Thimet: Both Admire Pro and Thimet are fully compatible with inoculant, as are Proline and Propulse (when used for disease). It certainly is critical to take care of the inoculant, but this mostly comes down to careful storage, handling, and tank preparation (don’t expose the inoculant to heat, don’t let it sit in the tank overnight, no chlorinated water).
As far as Admire vs. Thimet is concerned, both will provide good thrips control, with Admire possibly doing a little better there. Of the two, Thimet decreases TSWV severity, whereas Admire increases its severity. The difference in yield can be noticeable, and sometimes significant. It is not always a deal breaker though. If the grower is using a highly resistant variety to TSWV (Bailey and Sullivan are very good, and even 06G/Florida-07 are pretty good) and doing other things to lower their risk (planting near mid-May, strip tillage, good uniform emergence, and twin rows all lower TSWV risk), then this helps reduce potential drawbacks of Admire. By itself Admire could increase virus expression, but when other things are done to also help out it can be a pretty smooth situation.
I’ve had some growers saying they can get Thimet cheaper than Admire Pro, and others saying it is the other way around. Most everyone will agree the liquid Admire Pro is the more convenient of the two. I usually tell growers that by itself, Thimet will manage virus better, but they can still be successful with Admire if they do some of these additional things to lower their risk. They don’t have to do everything listed above, but the more things they can do to lower their risk the better. Some growers get good consistent results from Thimet and are happy to continue using it, and others may get more uneven coverage if it gets stopped up in the tubes or if their rig is bouncing down the field, which is one of the reason some growers want to move to the liquid Admire Pro.
Some of the varieties that have a little higher susceptibility to TSWV include TUFRunner 511, TUFRunner 727, FloRun 107, Georgia 09B, and Champs. If the growers get good consistent results with Thimet, this would be good to use with these varieties. If growers are planting these in combination with Admire it will be more important to include as many other cultural practices as possible to lower their risk.