When To Apply Grub Control

I would like to know when to apply GrubEx or Bayer to our lawn for the control of Japanese Beetle grubs. Should Milky Spore be applied at a different time of year?

GrubEx is the brand name of a product from Scotts. GrubEx is very effective against Japanese Beetle (JB) grubs as they hatch from the egg. GrubEx is not very effective at all against grubs any larger than this stage and should not be used. For proper application in most areas, apply anytime from late-spring through mid-summer. For best results, apply GrubEx in June through July.

Milky Spore is a naturally occurring bacterium white grubs of Japanese Beetles.

In the August time frame when the grubs are close to the surface and actively feeding they are vulnerable to infestation by Milky Spore. This is also the optimal time frame for turf inoculation or applications with Milky Spore to increase Milky Spore in the soil environment.

Resident spores in the soil are swallowed by grubs during their normal pattern of feeding on roots. This ingestion of the spore by the host activates reproduction of the bacteria inside the grub. Within 7-21 days the grub will eventually die and as the grub decomposes, billions of new spores are released into the soil.

Milky Spore in the soil is not harmful to beneficial insects, birds, bees, pets or man; and Milky Spore like other bacteria is highly survivable in cold and drought conditions.

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