Weeds AR Wild S6 Ep4: Pre vs. Post Flood Weed Control in Rice, Cut Off Timings, Controlling Large Grasses
The passing of Dr. Jim Barentine, a revered weed scientist and former department head at the University of Arkansas, is honored at the start of this episode, with heartfelt tributes from hosts Bob Scott, Tom Barber, and Jason Norsworthy. His legacy lives on through the Barentine Delta Classic Golf Tournament and scholarships supporting crop science students. The episode then shifts to urgent field concerns: post-flood weed control in rice, where delayed flooding due to wet conditions has led to a surge in large grasses and sedges. Experts warn that pre-flood applications are critical—especially with strong residuals—because post-flood control is costly, less effective, and risks crop injury. A major concern is the poor performance of High Card on large grasses and its severe injury to Max Ace 75-31 rice under cool, wet conditions. The team emphasizes waiting 72 hours after applying ACCA herbicides like Provisia and Ristar before flooding to prevent crop damage. Drift issues from drones and tank contamination are also highlighted as growing problems, particularly with sulfonylurea herbicides on soybeans. Finally, the discussion turns to late-season soybean applications, where data shows minimal yield loss even beyond R1 cutoffs—though labels remain legally binding. The episode concludes with a strong push for upfront residual herbicides and narrow-row planting to avoid late-season salvage applications altogether.
Wait 72 hours after applying ACCA herbicides (Provisia, Ristar, High Card) before flooding to prevent severe rice injury.
Pre-flood weed control is far more effective and cheaper than post-flood salvage applications—especially for large grasses and sedges.
High Card performs poorly on large annual grasses and can severely injure Max Ace 75-31 rice under cool, wet conditions.
Drone applications pose significant drift and spray distribution risks—treat them like any other sprayer with proper calibration and contamination control.
Tank contamination from herbicides like Permit Plus can cause serious crop injury; triple-rinse and clean sprayers thoroughly between crops.
…and 3 more takeaways available in PodZeus
Honoring Dr. Jim Barentine's Legacy
“He could not pass up their biscuit. He said it was the best sausage biscuit that you could get between there and Little Rock. And they had the best, freshest coffee.”
Pre vs. Post Flood Weed Control in Rice
“If you're not clean when you go to flood, you're going to throw a lot more money cleaning up big grass sedges, weeds post-flood.”
High Card Performance and Crop Injury Risks
“I saw some Max Ace Rice this past week that died from a high card application. And no one wants to be in that situation because obviously that then is going to turn around and lead to... having to replant.”
Drift and Contamination Issues in Soybeans
Drift from sulfonylurea herbicides (Permit, Regiment) and drone applications are causing significant crop injury in soybeans. The hosts warn that drones are not inherently safer and can cause drift and incorrect spray distribution. Tank contamination from improper cleaning is also a growing problem.
Late-Season Applications and Residual Programs
Despite R1 cutoffs on soybean labels, recent data shows minimal yield loss from late applications. However, the hosts stress that labels must still be followed. The best defense is a strong residual program at planting combined with narrow-row planting to achieve early canopy closure and avoid late-season weed control.
“I mean, to the tune of actually killing Max Ace Rice, which I saw some Max Ace Rice this past week that died from a high card application. And no one wants to be in that situation because obviously that then is going to turn around and lead to... having to replant and replanting rice.”
“if you're not clean when you go to flood, you're going to throw a lot more money cleaning up big grass sedges, weeds post -flood.”
“You know, and he could not pass up their biscuit. He said it was the best sausage biscuit that you could get between there and Little Rock. And they had the best, freshest coffee.”
Host
Guests
Dr. Jim Barentine
person
High Card
other
Provisia
other
University of Arkansas Division of Ag
organization
Ristar
other
Clencher
other
Glufosinate
other
Permit
other
Max Ace 75-31
other
Roundup Liberty
other
Start discovering podcast insights today
Start with a 7-day trial and explore a growing catalog of popular podcasts. No credit card required.
No credit card required • 7-day trial • Cancel anytime