If you suspect you may have white grubs in your soil, you should inspect your soil to see if you have enough grubs in your soil to warrant control measures. A few grubs in the soil are normal and your grass should be healthy enough to withstand a few grubs feeding on the roots, but more than that can definitely warrant corrective action. Here are the steps to inspecting your soil for grubs:
- Survey the suspicious areas in your turf. August and September are good times to inspect the turf because the grubs will be active and close to the top of the soil.
- Start by using a spade to cut square foot sections of turf, about 2-4 inches deep in several different areas.
- Pull back the square foot area to expose the soil below.
- Closely inspect the turf, thatch, and soil for grubs.
- Generally, less than 5 grubs per sample is a normal amount that doesn't warrant control measures. More than 5 grubs per soil sample are enough to require control measures.
- Replace squares of sod and pat down. Water in patches to avoid drying.