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Lawns burning after app.

8K views 26 replies 15 participants last post by  Dave Stuart 
#1 ·
My lawns are browning after apps. First time this has ever happened. I calibrated and the rates are normal, using the same mix as usual ( 24d, Aquacap, Double Feature, 46-0-0, and imidicloprid.

The only difference is I'm using Mecamine D instead of 3 way. The mixes never sit in the tank longer than 24 hours, so I don't think I'm getting urea degredation.

It has been cooler and wetter than normal.

Lawns are browing out and completely burning in limited areas. What could be causing this?

Can you help?

BTW I am licensed and have years of experience !
 
#27 ·
24D, mecaprop, MCPA are standard phenoxy's used in 3way herbicide mixtures.
Dicamba is a systemic and in the benzoic acid class /also common in 3 way blends.
Then there are the newer chemistries with fast leaf cuticle penetration and translocation that are in today's blends clopyralid & fluoroxypr / trade names confront and momentum.
Mecamine D is composed of 24D, mecaprop and dicamba, the same as the old trimec 992 - it's rates are 3 to 4 pints per acre ( standard for efficacy with this product ) the only difference are the amine salt percentages slightly.

If the turf is herbicide damaged there will be epinasty ( twisting and curling of the leaf from the rearrangement of cells in the leaf mesophyll ) even monocots such as turf grass can only tolerate so much herbicide. This is a key indicator that the broadleaf material was the culprit.
If the urea did the damage the turf will stay erect and become uniformly chlorotic ( yellow ) at 1st, then become uniformly brown / lose its elasticity or cell turgor from salt damage and finally wilt.

Use these as indicators for the future, hopefully you never experience this again.

Dave Stuart MA/ plant physiology, soil science.
 
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