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Japanese Beetles, Grubs and Moles

June 7, 2018

The first Japanese beetles of the season are showing up on roses and other plants. It is important to kill these scouts that will help the others find the most desirable plants in your landscape.


Japanese Beetles eat the foliage of many plants and then lay eggs in your lawn that become grubs in late summer that feed on your grass roots until winter.

When you spot the first beetles you can hand pick them into a jar of soapy water or spray susceptible plants with an insecticide that is compatible with flowers and vegetables. Ortho Flower Fruit and Vegetable Insect Killer does not need to be mixed up and kills around 100 different kinds of insects that can attack plants. Read the label and you will see this product can be used on edible crops.

Some folks have tried Japanese Beetle traps with mixed results. The reason is many times these traps attract more beetles to their plants than they actually collect. If you take this approach, place the trap several hundred feet away from the plants being attacked (but not next to your neighbor’s roses).

These beetles will soon be laying eggs in your lawn that will hatch into grubs to chomp on your grass roots beginning in late summer and continuing into fall. If you have already spread Scotts GrubEX on your lawn during the past few weeks, your grass is protected from the next generation of grubs. If not, you still have time to protect your lawn, be sure to give your lawn a good watering of at least a half inch after you spreading GrubEX. It is OK for your pets and kids to play on your lawn after the grass has dried.

Of yes… and one last tip regarding moles: Since GrubEx does not eliminate earthworms in your lawn (one of their favorite foods in addition to grubs) you are still likely to get moles even though the grubs are not present. For mole problems, click here to check out this info on the options from TOMCAT.

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