Sod - Knowledgebase Question

Colton, Ca
Question by rossai
September 15, 2010
We installed our new sod on April 17. We cut the grass every week,water twice a day. We notice yellow and white circles. Mushroom grow around the edges. Do we need to buy a insect killer for the white circles on the grass?


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Answer from NGA
September 15, 2010

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I hope there's a typo in your question and you actually water twice a week rather than twice a day. New sod should not have insect problems but it can develop fungal problems if it is kept too wet. Mushrooms indicate there's some decomposing organic matter in the lawn. This might be compost, thatch, or even dead and dying roots if the soil is kept too moist. The circles can indicate a fungal disease but it's difficult to diagnose without seeing it. Generally fungicides are not necessary if you change your watering habits. Try watering deeply once a week during the spring and fall months and twice a week during the hot summer months. The goal is to apply one inch of water per week to your lawn. If you're not sure how much water your sprinklers put out, place several empty cat food or tuna cans on the lawn and run the water as usual but make a note of the time you turn on the water. In fifteen minutes turn off the water and measure the amount of water collected in the cans. You can adjust how long you keep the water on based upon how much water is in the cans after 15 minutes. The goal is one inch of water per week. If you're watering twice a week, one half inch of water should collect in the cans each time you water. Best wishes with your lawn.

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