Q: What can I tankmix with Roundup in Roundup Ready soybeans to control wild buckwheat?
A: Many farmers TRY Harmony GT (or the new SG formulation), but Pursuit is much better. Plus, it leaves residual. This doesn’t work if you’re going to rotate to sugarbeets, sunfl owers, or a few other crops, but if you’ll be going to corn or wheat next year…no problem. Just keep the rate relatively low. On our farm, we use 2 oz (half rate) of Pursuit. It’s not perfect, but it defi nitely helps. When adding Pursuit, add non-ionic surfactant besides AMS, too.

Q: How about lambsquarters?
A: Here’s where Harmony GT (or SG) is the best fi t. Sure, I like Valor or Domain lots better pre-emerge, but if you didn’t do that, use some Harmony GT. Keep in mind, you’ll get some crop response, and possibly a little antagonism on a few other weeds, but nothing is better than Harmony GT on lambsquarters, although Resource or Pursuit could help Roundup a little bit.

Q: Waterhemp?
A: Increase your Roundup rate from 22 oz. of 6# Roundup to at least 33, if not 44 oz. per acre. Otherwise, you could add Flexstar or our old favorite (just kidding) Cobra. Remember how we used to tell you to take a 2-week vacation immediately after spraying Cobra? Oh, the memories.

Q: Volunteer corn?
A: Use Select Max at 6 oz. per acre. You’ll get good corn control AND a big rebate from Monsanto if you used name brand Roundup. If you also used Harness in your corn, your rebate is even bigger. Literally, your net cost could be less than $1 per acre for Select Max if you prepaid in December
AND used WeatherMAX and Harness on your farm. That’s cheap considering volunteer corn is perhaps the biggest yieldrobbing weed in soybeans.

Q: Is there any use for Classic with Roundup?
A: Yes. Although it’s not a popular tankmix, Classic is very good on sunfl owers, cockleburs, and velvetleaf. It alsohas good activity on problem weeds like yellow nutsedge, marestail, jimsonweed, morningglory, prickly lettuce, ragweed, and dandelion. Unlike most other Roundup tankmix partners, Classic also has some, but limited, residual activity.

Q: Can I put any insecticide with Roundup to control soybean aphids, bean leaf beetles, grasshoppers, spider mites, or other bugs?
A: Check the label, but just about any insecticide I can think of CAN be tankmixed with Roundup.

Q: Can I foliar feed with Roundup?
A: Most foliar fertilizers can be tankmixed with Roundup, but make sure you never have Lorsban in the tank, too. Check with your fertilizer supplier before mixing fertilizer with Roundup AND do a jar test to make sure they’re compatible.

Q: How about fungicide?
A: Most fungicides CAN be tankmixed with Roundup, BUT spray coverage is way more important with fungicide than it is with Roundup. Roundup moves easily in the phloem of the plant, which goes up and down, moving the herbicide where it needs to be to stop your weeds. Fungicide usually moves only in the xylem, which moves upward only. In other words if you don’t thoroughly cover ALL the leaves on your plants from top to bottom, diseases can still set in on untreated areas. If you want to tankmix Roundup with fungicide, spray only on calm days with fl at fan nozzles and NO drift retardant for the best coverage and best results possible.