Weed Control Questions Peanut Notes No. 127 2024
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Collapse ▲Question 1:
Grower has weeds and grasses. Weeds include morningglory (pitted and entireleaf,) pigweed, Palmer amaranth, cocklebur and purslane. One of the fields has been sprayed with Storm and Butyrac only and another sprayed with Gramoxone, Dual, and Basagran. Farmer is planning to use Cadre. What should mix with Cadre?
Jordan:
Cadre plus Ultra Blazer (or Cobra) plus 2,4-DB plus 80/20 surfactant at 1 quart per 100 gallons. In a few weeks we can see what gets through and correct. Cadre will give some grass control. Sometimes it is enough.
Question 2:
Spray recommendation. Farmer is chopping out big pigweeds now. (Image had very large entireleaf morningglory.)
Jordan:
I would see what Ultra Blazer at 1.5 pints plus 2,4-DB at 1 pint does.
Follow up:
Used 1.5 pints of Ultra Blazer already.
Jordan:
2 sequential sprays of 2,4-DB.
Follow up:
Would you use Cobra or Cadre? How close together should sprays be?
Jordan:
2 weeks for another PPO. Cadre will miss some weeds (Palmer amaranth) due to resistance. 2 sprays of 2,4-DB might suppress Palmer amaranth well enough. But if there are small weeds in addition to big ones, a PPO will get the small ones.
Follow up:
Two sprays of 2,4-DB at one pint, 2 weeks apart with surfactant?
Jordan:
Yes, 80/20 surfactant. Can likely tag it along with a fungicide spray for one of the applications.
Question 3:
Peanuts have been blooming for two weeks. Grower wants to spray Zidua + 2,4-DB + MSO (methylated seed oil). Any concerns?
Jordan:
Leave off MSO. Not helpful and will likely increase injury.
Question 4:
Grower wants to apply Basagran plus 2,4-DB for nutsedge and sicklepod. Is there something better?
Jordan:
This will control yellow nutsedge and sicklepod. It will not control purple nutsedge, but that species is very limited across the peanut belt at this point in time. Cadre is the best option as it will kill both weeds in question. It does have a carryover restriction to cotton.
Follow up:
The growers has already applied Cadre.
Jordan:
Cadre works a lot better when we get rains behind it. It has been dry, so that might explain why the farmer feels like a second application of something is needed. Overtime, the Cadre may control many of the weeds with its residual activity. But the mixture of Basagran and 2,4-DB with 80/20 surfactant is the next most effective treatment on these weeds.