Arbico Organics) and sprayed on a lawn in a solution of water. Calibrating application rates can be tricky, and nematodes are very sensitive to heat and sunlight, requiring application in the early morning or near dusk. Also, the lawn must be irrigated before and after application.

But here’s some disappointing news: There is little evidence that controlling the grub population will reduce damage to your roses or raspberries — or vice versa. Adult beetles can fly from a distance, seeking favored foods or turf that is suitably moist for egg-laying (about 11 percent soil moisture is required for egg survival and hatching).

A Way to Garden, and a book of the same name.

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