The Q&A Archives: Lawn-Brown patches,fungicide & grub killers.

Question: I live in Commack n.y. My lawn has brown patches. I put down fungicide 8/14. When should I apply more fungicide. Can & when can I apply grub killer. We have mostly kentucky blue grass & lots of sun. We have a large oak tree on our lawn.That area is shaded and looks fine.Please help before It takes over my entire lawn front & back.

Answer: Check the package label on your fungicide. It will indicate whether or not a second application should be made and if so, how long to wait between applications. Sampling for grubs is a good first step in determining the cause of your lawn problem. You can cut a square foot of turf out, pull it up and look on the soil surface and on the roots for fat, white grubs; less than six grubs per square foot can usually be masked by water and fertilizers. Populations between 10 and 15 per square foot can cause significant turf damage in September and October. Of course, populations occasionally reach 40 to 60 grubs per square foot and these levels can cause significant damage. If you find grubs you can treat your lawn with a product like Grubex or Bayer Advanced Season-Long Grub Control granules, applied according to label directions. If you don't find grubs, you can simply rake out the bare spots, sprinkle some compost over the areas and reseed. Grass seed should germinate in 7-14 days.

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