What causes colour change to yellow
churin – posted 17 August 2011 18:43
Could anyone tell what is causing the colour change as shown below?
http://khonjo.home.mindspring.com/pictures/IMG_5507X.jpg
jugheadfla – posted 18 August 2011 08:07
quote:Originally posted by churin:Could anyone tell what is causing the colour change as shown below?
Looks like either a fungus or disease to me. The other parts of your grass look fantastic! Have you received a lot of rain in your area lately?
churin – posted 18 August 2011 09:02
I am in Atlanta area. Last year, Bermuda grass of my entire lawn was replaced with emerald Zoysia(sod). In this past May, I noticed the same symptom and my lawn care contractor did fungus treatments in May and June. When that treatment was done in May, the spreading of the yellowing area was beginning to subside. The yellow patch area has not heeled yet but only the yellow colour faded to light colour and the patches are still in that condition.Now the yellow patch begin to emerge again in other part of the lawn. We had adequate rain in July to the first week of August but no rain and above 90 degree for the past 10 days. I have been watering everyday for the past 6 days.I am thinking of asking the contractor for the fungus treatment again (last time they said it’s fungus and I followed their recommendation), but I am wondering if it is really fungus problem.
[This message has been edited by churin (edited 18 August 2011).]
jugheadfla – posted 18 August 2011 11:24
quote:Originally posted by churin:I am in Atlanta area. Last year, Bermuda grass of my entire lawn was replaced with emerald Zoysia(sod). In this past May, I noticed the same symptom and my lawn care contractor did fungus treatments in May and June. When that treatment was done in May, the spreading of the yellowing area was beginning to subside. The yellow patch area has not heeled yet but only the yellow colour faded to light colour and the patches are still in that condition.Now the yellow patch begin to emerge again in other part of the lawn. We had adequate rain in July to the first week of August but no rain and above 90 degree for the past 10 days. I have been watering everyday for the past 6 days.I am thinking of asking the contractor for the fungus treatment again (last time they said it’s fungus and I followed their recommendation), but I am wondering if it is really fungus problem.
[This message has been edited by churin (edited 18 August 2011).]
I’m not sure if you should be watering every day at this point. That sounds like too much watering to me and that can cause Fungus to form. Personally, I water twice a week for 50 minutes per zone and it seems to work fine for me and I’m in Tampa, FL. One thing to remember about zoysia is that it is slow to heal from disease, although it will do so eventually. I would have another fungus treatment done, and adjust your water to less frequent and deeper in the early morning and not overnight.
churin – posted 18 August 2011 13:50
I wondered about watering period if it is adequate because by 10AM colour of the green turnes to that showing heat stress and the leaves curl.The watering time has been 20 minutes per zone beginning at 4:00AM. I will change the time length from 20 minutes to 50 minutes and reduce the watering frequency to 2 times per week. I think watering start time at 4:00 AM can stays. I will do the fungus treatment by myself this time(they charge $90 per application).
[This message has been edited by churin (edited 18 August 2011).]
ezf – posted 18 August 2011 18:50
I replaced one pallet of Bermuda with emerald Zoysia about 1.5 years ago. I live 30 miles north of Atlanta. I am fortunate that I haven’t had any fungus problem so far, and the Bermuda is not able to invade the extremely dense mat of emerald Zoysia. My neighbors can’t tell there is a patch of Zoysia in the Bermuda lawn, they look very close to each other. I don’t use any chemical on my lawn and water the Zoysia patch with a soaker hose for an hour if there is no rain for more than a week. I find the sprinkler not effective because most water can’t get to the ground due to the density of the grass.
churin – posted 18 August 2011 22:11
My area is about 10 miles north of 285 so we are in the same general area.From time to time during the summer season I used to see mushrooms on the lawn before replacing the Bermuda with Zoysia. So, the fungi may be still there.You mention the density of the Zoysia. Because of that I was wondering if the water by sprinkler can hardly get to the ground. Maybe 50 minutes of watering can as suggested by jugheadfla. I can try the soaker hose for the area that looks dryer, but it appear impractical for the entire lawn area.
ezf – posted 18 August 2011 22:44
Watering the grass for an hour with a sprinkler once a week definitely helps. Last year my emerald Zoysia was new and I have to water it for an hour every 4 days during the summer. This year I made a mistake in the Spring by applying about 1 lb Nitrogen (Milorganite) to the zoysia patch (400sf). It was too much and caused it to grow some thatch. I spread some sugar after a rain and find that it can stand a whole week without watering in these hot days. This seems to gradually solve the thatch problem. Though emerald is less drought tolerant than Bermuda, I still like it better because I essentially don’t need to do anything other than occasional watering and mowing. It’s always dense and there is no weeds. BTW, I cut my lawn at 3 inches for better drought tolerance.
churin – posted 19 August 2011 07:37
I have read a post somewhere else in this forum about spreading sugar on lawn, but what exactly does sugar do?
ezf – posted 19 August 2011 13:58
Sugar boosts the population of microbes in the soil/thatch, and they will eat the thatch down, improve soil structure and suppress the population of disease-causing microbes. These are major claims of organic lawn care. I have used organic lawn care for about two seasons and had no lawn diseases. You may spread some sugar and (milk, corn meal or soybean meal) to the weak spots.
jugheadfla – posted 19 August 2011 14:51
quote:Originally posted by ezf:Sugar boosts the population of microbes in the soil/thatch, and they will eat the thatch down, improve soil structure and suppress the population of disease-causing microbes. These are major claims of organic lawn care. I have used organic lawn care for about two seasons and had no lawn diseases. You may spread some sugar and (milk, corn meal or soybean meal) to the weak spots.
Is there a specific kind of sugar that you use, or is it plain old Dixie Crystals?
ezf – posted 19 August 2011 15:30
Just plain sugar in Walmart. I find that spreading sugar right after a rain is much more effective, possibly because the sugar attracts moisture and stay in the thatch layer rather than being washed down/away.
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