It’s the start of white grub killing season again. The grub is a turf grass-destroying larva of the June bug. They eat the roots of grass. If it makes you feel any better, everyone has grubs, even if the lawn shows no damage. Looking for grubs requires removing a sod size piece of lawn that is three to four inches thick with a shovel. I was taught that four or more grubs per square foot indicate a problem and should be treated.
There are both all-natural and synthetic ways to treat for grubs. Grubs are actively feeding from July to October. To get the most of your grub killing dollar, apply synthetics in the middle of June through the end of August. Products with the active ingredient Imidacloprid are the best on the chemical side. We carry Grub Beater from Bonide and Grub Control from Bayer. Both will treat up to 5000sf and Imidacloprid is the active ingredient with Grub Beater being a little cheaper.
The all-natural side has two standouts, Milky Spore and Beneficial Nematodes. Milky Spore is a bacterium that kills grubs. The instructions say to apply it three times a year for two years and done. Opinions vary on the effectiveness of Milky Spore, but I am on the positive side. Beneficial Nematodes are the next all-natural choice. Apply them as the sun is setting on wet soil and lightly water after. Be sure to apply them before it gets too hot. We offer two sizes that cover up to 1/4 acre and 1/2 acre.
You’ll have to know how many square feet you need to treat and read and follow the manufacturer’s instructions.