Females lay 1 to 5 eggs before returning to plants to feed and mate. After feeding and mating for a day or two, the females burrow into the soil to lay eggs at a depth of 2 to 4 inches. Newly emerged females also release a sex pheromone that attracts males. These early arrivals then begin to release that aggregation pheromone (odor) that attracts additional adults. The first beetles out of the ground seek out that suitable food, like Honeycrisp, and begin to feed.
The adult beetles normally emerge during the last week of June through July. Adults can fly up to five miles to locate a feeding site however, they tend to fly only short distances to feed and lay eggs. The adults produce aggregation pheromones that attract individuals (both males and females) to the same feeding location. Adult Japanese beetles emerge from the soil and live from 30 to 45 days feeding on plants over a four-to-six-week period.
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