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Old 10-15-2009, 09:00 AM
Location: Houston
63 posts, read 288,778 times
Reputation: 65


I just moved into my first house in Katy, TX this past summer. It is my first lawn so I am kind of new at this. I have a sprinkler system that waters the grass for 20 minutes every three days. I fertilize with Scotts Turfbuilder (based on recommendation from Scotts representative who was at Home Depot that day). I used the exact settings recommended on the bag.

Since three weeks ago or so, I have noticed yellow spots appearing on the lawn. Anyone know what could be causing this? Is it a seasonal thing when fall comes around the corner?

Any suggestion would be appreciated.

http://i652.photobucket.com/albums/uu249/rhopper07/grass1.jpg (broken link)
http://i652.photobucket.com/albums/uu249/rhopper07/grass2.jpg (broken link)
http://i652.photobucket.com/albums/uu249/rhopper07/grass3.jpg (broken link)
http://i652.photobucket.com/albums/uu249/rhopper07/grass4.jpg (broken link)
http://i652.photobucket.com/albums/uu249/rhopper07/grass5.jpg (broken link)
http://i652.photobucket.com/albums/uu249/rhopper07/grass6.jpg (broken link)
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Old 10-15-2009, 10:40 AM
Location: God's Gift to Mankind for flying anything
5,711 posts, read 12,493,270 times
Reputation: 4744
Some of those yellow spots look they are *in line* with when you were doing the fertiliser dance.

If so, then you probably *burned* the lawn, with an overdose of fertiliser.

Nothing you can do about that except for continuing your watering for a while, and check if your spreader is working properly. There is a calibration method available and you may need to *clean* the chute ?

OTOH, 20 minutes every three days may not be what you want in your area.
A *deep* watering every so *even longer between watering* may be better especially if you water at night.
I water once a week for an hour, between 01:00 and 03:00 hrs.
I live in a dessert area, and my grass is green and NO brown spots anywhere.

LBNL, if you have some areas, that are really yellow in just one spot, you may have *grubs*, and you need to apply some other stuff *against grubs* on that area alone.
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Old 10-15-2009, 11:22 AM
432 posts, read 3,432,217 times
Reputation: 408
It is almost DEFINATELY brown patch disease. With the recent rains here in San Antonio, everyone is my neighborhood has it now. The spots get bigger and bigger and then eventually the center starts to regrow back. I bought some Bayer brown patch fungicide to deal with the issue, hopefully it speeds up the recovery process!
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