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Old 07-18-2013, 01:44 PM
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RigglePLC RigglePLC is online now
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Herbicide, spurge, heat test

I tested five herbicides against spotted spurge. Quicksilver,T-Zone, Speedzone, Surge, and a generic three-way.
Speedzone was most effective; T-zone was a close second. The remaining products were only fair.

I tested the above products at high rates at 90 degrees; it was 94 as a high in the next two days. I sprayed a half sq foot spot 6 times for each product . Temperature was 94 as a high in next two days. There was no sign of injury to the grass which was in light shade. Grass species was fine fescue and bluegrass.

What is your experience? Have you caused damage from herbicide at high temperatures?
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Old 07-18-2013, 11:44 PM
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DA Quality Lawn & YS DA Quality Lawn & YS is offline
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No herbicide damage.....but sure shootin had some damage from PG tracks on semi dry lawns at higher temperatures. Clearly defined tracks in white, wherever I drove. If it is anything above 85 and the turf is remotely dry, I am not spraying period. Lesson learned.
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Old 07-19-2013, 01:24 AM
Chilehead Chilehead is offline
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Did you use a spreader/sticker in your mix? I generally use Surge (only 1 oz./gal. in this heat) with a bit of spreader/sticker, and usually mix in some lawn disease control chems.
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Old 07-19-2013, 04:13 PM
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RigglePLC RigglePLC is online now
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Those brown tire tracks are called "heat tracks". Mysterious--actual cause is unknown--it happens when green grass is beginning to wilt and tires roll over it. Nothing to do with herbicide or fertilizer. It looks ugly when it is caused by mowing.

I am still not sure if there is a point when it is too hot for herbicides, if so which herbicides? If so which species of weeds? What about too cold? It just works slower when it is cold...right?
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Old 07-19-2013, 04:16 PM
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http://www.lawnsite.com/showthread.p...+tracks+riggle

That damage is called "heat tracks" by some experts. Not due to herbicides as far as anyone knows. Rather mysterious. Happens at times. Other times--no problem.
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Old 07-19-2013, 04:44 PM
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Bad link.
Here is a new link.
http://msue.anr.msu.edu/news/heat_tracks_on_lawns
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  #7  
Old 07-19-2013, 05:48 PM
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Speedzone at 1oz per gallon in backpack damages burmuda real bad above 90F.
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  #8  
Old 07-23-2013, 01:50 PM
TurfWerks TurfWerks is offline
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I leave my surfactant out in hotter weather.. Ive never seen yellowed permagreen tire tracks in a lawn as far as I can remember.. Ive sprayed Speedzone, vessel, etc... all above 90 degrees with some minor yellowing..
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  #9  
Old 07-24-2013, 08:54 PM
jbturf jbturf is offline
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starting to see some ugly heat tracking here, mostly unirrigated turf, from mower tires, its kinda funny looking 2 lines close together then 3' space,

we finally got rain yesterday like 2.5 inches
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Old 07-25-2013, 08:43 PM
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Quote:
Originally Posted by jbturf View Post
starting to see some ugly heat tracking here, mostly unirrigated turf, from mower tires, its kinda funny looking 2 lines close together then 3' space,

we finally got rain yesterday like 2.5 inches
Good rain.

Luckily with heat tracks, some good rainfall or watering and a shot of N and it goes away within a couple weeks.
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7x14 Stealth SE Enclosed with 48" side ramp
08 Toro Z400 48" deck, 21HP Kaw with EZ Vac twin bag
09 Exmark Turf Tracer HP 36"
21" Toro SR4 Super Recycler
Stihl KM90 Kombi w/ straight shaft trimmer & tiller heads
Husqvarna 125B Blower
PG Magnum
Turfco XT5 Aerator
Turfco LS-22 Overseeder
EcoLawn 200 Applicator

I can do all things through Him who gives me strength.
Philippians 4:13
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