Rates for Diquat in rough for poa Cancel The title field is required!

1. Cecil Daniel

   

   0 posts
   
   12/10/2015 10:12 AM

   I am going to clean up some poa in the rough with Diquat due to resistance issues. Just curious about rates from anyone that has done it. Also, were there any issues with spaying in thin areas around tree lines. I am going to try and wait until the frost takes all the color out of the rough, but we never go all the way dormant.
   Thanks

   
   
   
   
2. Ken Siems

   

   1 posts
   
   12/10/2015 11:12 PM

   Hi Cecil,
   What grass type are you going to apply the Diquat to.? If it is fine fescue, I have had very good success with Roundup.
   Ken

   
   
   
   
3. Andy Jorgensen

   

   1 posts
   
   12/11/2015 6:12 AM

   Cecil,
   
   We used to use Diquat in Atlanta at 16oz/ac. It would knock back the Poa pretty hard, but some of it still came back. I know guys out in the desert use it around bunkers and non-overseeded areas to burn back the Bermuda to provide very dramatic contrast against the lush overseed. Maybe one of them will chime in.
   
   Also, have you had you Poa tested for resistance or just going by past experience with products not working? Dr. Jim Brosnan at University of Tennessee provides this as a service and just recently tested ours. He provides a great report that you can show your management or members. That being said, he recommended Specticle as a pre-emergent, and Kerb as a post in areas wshere we have known ALS resistance. Below is Dr. Brosnan's email.
   
   jbrosnan@utk.edu

   
   
   
   
4. Cecil Daniel

   

   0 posts
   
   12/11/2015 6:12 AM

   Thank you both. We are growing 419. We have had als resistance. We have not had a test, but sulfanoureas won't touch it. I had to apply kerb to greens last year and have applied it to all fairways this year. It works well. It would break the bank if I applied it to rough as well.
   
   I have read that poa seeds can remain viable for 5 to 6 years in the soil. With us killing the poa before it went to seed last year, our greens are clean. It is promising to think that if I can stop it on the taller cuts this year we may not have such a problem next year. I am trying to hit it hard this year and reduce the seed bank on the entire course.
   
   The Diquat label says 1 to 2 pints per acre. I think I will do a test acre at the low rate.
   
   Thank you. I would love to hear from a few other folks.

   
   
   
   
5. Patrick Reinhardt

   

   0 posts
   
   12/11/2015 9:12 AM

   I used 16oz/acre on bermuda as well when I was in Atlanta. We were pretty dormant though. Haven't tried it down here on coast.

   
   
   
   
6. Robert Crockett

   

   4 posts
   
   12/17/2015 10:12 AM

   You could apply lower rate apps @ intervals conducive to your part of the region. Standard Dormant Bermuda grass @ 2qt's/acre = 64oz's divided by 2 (+/-) 3 apps, over the period of time (you think you need) based on Dormancy and Spring. "E.G"..... Mid Feb? and 3 (+/-) 4 week intervals. Just a thought you could expand on. I like R-up because of it's MOA and cost effectiveness.
   
   
   Bipyridyliums
   
   These foliar applied, strongly cationic, relatively toxic herbicides are used postemergence only. Extremely strong binding to clay prevents activity for weed control or leaching in the soil. Only shoot kill can be expected. Liquids with suspended colloids (muddy water, slurry fertilizers) cause inactivation. These herbicides are used for general shoot kill in numerous situations including burn down in conservation tillage systems and preharvest desiccation. Diquat is used for control of aquatic weeds.
   
   
   Amino Acid Inhibitors (Aromatic)
   
   Glyphosate and sulfosate are the compounds with this mode of action. Uses are limited to foliar applications only, since these chemicals are rapidly inactivated in the soil. Symptoms include yellowing of new growth and death of treated plants in days to weeks. These relatively nonselective compounds control annual grasses, annual broadleaves, johnsongrass, quackgrass, yellow nutsedge, cool season pasture and turf grasses, cattail, Canada thistle, hemp dogbane, Jerusalem artichoke, poison ivy, and multiflora rose. Glyphosate tolerant cultivars of soybeans (Roundup Ready), corn, and other crops are currently being marketed. Corn and other glyphosate tolerant crops are being tested for future release.
   
   Common Trade
   Name Name
   
   glyphosate ROUNDUP ULTRA/
   RODEO/ACCORD
   sulfosate TOUCHDOWN

   
   
   
   
7. Cecil Daniel

   

   0 posts
   
   12/17/2015 11:12 AM

   Thank you
   
   Round up is out of the question. We never go dormant enough. The old superintendent tried it ounce and we had to sprig a few large areas in spring. My test plot at 16 oz/acre worked well. I may get some regrowth on a few larger plants, but I can come back with a small tank if the rebound. With as far south and as close to the ocean as we are, we come in and out of dormancy. I will have to wait for the next cold snap to spray more. I don't want to have to deal with questions from the membership.
   I will look into those other chemicals, but for now I have the Diquat on the shelf waiting.