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It is responsible for a disease (commonly called milky spore) of the white grubs of Japanese beetles. The adult Japanese beetles pupate in July (in the Northeast United States) and feed on flowers and leaves of shrubs and garden plants. During this adult stage, the beetles also mate and the females lay eggs in the soil in late July to early August.
Some grubs pack a triple whammy. They infest plant roots. Predators shred the lawn for grubs. And those that become Japanese beetles ravage plants.
The larvae, known as "chafer grubs" or "white grubs", hatch four to six weeks after being laid as eggs. They feed on plant roots, for instance potato roots. The grubs develop in the earth for three to four years, in colder climates even five years, and grow continually to a size of about 4–5 cm, before they pupate in early autumn and develop ...
The grubs hatch by late July. The grub population consists mainly of first instars in early- to mid-August, second instars by early September, and third instars by mid-September to early October. In frost zones, the grubs feed until November, then move deeper into the soil. In frost-free areas, the larva will feed all winter.
Treatment should be planned for early spring or late fall. On average, it requires 1– 1 + 1 ⁄ 2 inches (2.5–3.8 cm) of irrigation a week. [3] Experts suggest that it is mown to a height of 1 ⁄ 2 – 2 + 1 ⁄ 2 inches (1.3–6.4 cm) every 5–10 days. [6] Z. japonica is nearly resistant to disease, yet is subject to insect attack from ...
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