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  #11  
Old 06-28-2012, 04:46 PM
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cgaengineer cgaengineer is offline
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Quote:
Originally Posted by frotis View Post
When Speedzone says not to apply when temps are 85 or above. It is safe to apply if the temps are 75 that day, and going to be 90+ all the following days?
In my experience yes. Apply in eary morning when cool. Make sure customer follows irrigation advice. This advice is warm season turf (Bermuda)
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  #12  
Old 06-28-2012, 06:05 PM
greendoctor greendoctor is online now
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As long as the lawn is irrigated correctly, warm weather is not a problem. Having said that, I will not not hesitate to hold applications to lawns that are dried out because of mechanical problems with the irrigation system or incorrect operation of the system.

On a related note, manufacturers need to put a lot of CYA in the labels because there is no guarantee that someone will be as conscientious. I make suggestions concerning tank mixes and applications with the understanding that they are not done to lawns in no condition to tolerate it. Dismiss on a lawn that has not been watered or fertilized, Dismiss + MSO + a partner herbicide on a lawn that has not been watered or fertilized properly. Sure, you will see burn.
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Last edited by greendoctor; 06-28-2012 at 06:09 PM.
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  #13  
Old 06-30-2012, 10:44 PM
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As a test, I applied herbicides in hot weather, temps over 90 degrees. Non-irrigated grass(Kentucky blue, rye and fine fescue) in light shade. No significant rain for about 2 weeks. Hudsonville weather station is about 10 miles west of the trial; our city temperatures were a bit higher.
http://www.enviroweather.msu.edu/run...=hvl&mod=w_sum

I added a heavier application test on June 28th. In this test, I sprayed about 5 seconds when using a compressed air sprayer, (Quicksilver, Confront, and Surge), and 7 squirts when using squirt bottles, (T-Zone, Speedzone). This treatment was applied to grass in a 10 inch circle 24 inches above the white labels. Photos taken on the 30th, 48 hours later.

The only injury was a mild browning from the Confront. Top photo, left. There was slight injury from the T-Zone. The Drive herbicide was omitted on the June 28th test.
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  #14  
Old 07-08-2012, 09:50 PM
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On July 6 we experienced temperatures of 100 to 106. I tested 5 weed control products adjacent to a previous test, on a mixture of bluegrass, fine fescue and rye. Shady, and weather was dry for at least two weeks. I sprayed 5 times with squirt bottles, (Speedzone and T-Zone.) I used 3 seconds with hand held compressed air sprayers, (Surge, Confront, and Quicksilver). After 72 hours there was very slight browning on areas treated with T-Zone and Confront.
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  #15  
Old 07-08-2012, 09:57 PM
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Crabgrass seeds were planted in a small plastic cup in potting soil. After emergence, to about an inch tall, the soil was treated. I applied with 4 granules or about 4 pounds per thousand sqft of Dimension(dithiopyr) 0.13 percent. About 75 percent of the crabgrass was killed.
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  #16  
Old 07-15-2012, 03:00 PM
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heat vs herbicides

I tested four types of herbicide under high temperature conditions. The grass was Kentucky bluegrass, which was irrigated. Temperature was 83 degrees F. and rose to 94 later in the day. It was 95 on day 2; 92 on day 3, (July 15).
Products tested were T-Zone, Speedzone, Surge, and Quicksilver.
T-Zone and Speedzone were applied with "squirt bottles"; sprayed 3 times over and 5 times over. (About 1/40th of an ounce per squirt). Surge and Quicksilver were applied with hand held sprayers, using 2 seconds and then 3 seconds in the high rate spots. The amount recommended for 1000 sqft was added to one quart of water to prepare the spray solutions.

No visible injury to the grass resulted. Some weeds were killed although there were only a few weeds present.
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  #17  
Old 07-15-2012, 03:13 PM
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heat vs herbicides

I tested four types of herbicide under high temperature conditions. The grass was Kentucky bluegrass, which was irrigated. Temperature was 83 degrees F. and rose to 94 later in the day. It was 95 on day 2; 92 on day 3, (July 15).
Products tested were T-Zone, Speedzone, Surge, and Quicksilver.
T-Zone and Speedzone were applied with "squirt bottles"; sprayed 3 times over and 5 times over. (About 1/40th of an ounce per squirt). Surge and Quicksilver were applied with hand held sprayers, using 2 seconds and then 3 seconds in the high rate spots. The amount recommended for 1000 sqft was added to one quart of water to prepare the spray solutions.

No visible injury to the grass resulted. Some weeds were killed although there were only a few weeds present.

Whoops accidental repeat. Please delete.

Last edited by RigglePLC; 07-15-2012 at 03:15 PM. Reason: double post
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  #18  
Old 07-19-2012, 03:03 PM
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Heat vs herbicides

I tested 4 products on irrigated Kentucky bluegrass On July 13, 2012. Temperature was 83 and rose to 94 later in the day. Temperature highs remained above 90 for the next week.

Products tested were T-Zone, Speedzone, Surge, and Quicksilver.
T-Zone and Speedzone were applied with "squirt bottles"; sprayed 3 times over and 5 times over. (About 1/40th of an ounce per squirt). Surge and Quicksilver were applied with hand held sprayers, using 2 seconds and then 3 seconds in the high rate spots. The amount recommended for 1000 sqft was added to one quart of water to prepare the spray solutions.

At 6 days slight injury was visible on the T-Zone treatment (right)and none on the Speedzone treatment, left, (first picture).
Distinct browning was visible on the Surge treatment, right; no injury was visible on the Quicksilver treatment, (second picture).

Possibly this indicates triclopyr can cause injury at high rates. Perhaps Speedzone is a safer procduct at high temperates, or if you accidentally spray in excess. (And Quicksilver, also caused no injury).
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Last edited by RigglePLC; 07-19-2012 at 03:09 PM. Reason: ps
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  #19  
Old 07-19-2012, 03:09 PM
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frotis frotis is offline
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I wonder if the browning would have increased with a spreader sticker added.
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  #20  
Old 07-21-2012, 02:07 PM
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I did not test it with spreader sticker added. That is a good idea. Coming soon maybe--if the weather is hot enough.
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