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They start to feed on roots of clover and pasture plants from the time they hatch until September. They undergo three stages before pupation. During the summer months, the grubs moult and reach their second instar phase. By early autumn, they are usually fully grown and have reached their third instar phase.
Grubs grow up to 1 cm in length, have a slightly curved, legless body and are creamy white in colour with a tan-brown head. They live below the soil surface, and feed on roots and cambium at the base of trunks. They mostly cause damage to herbaceous plants, particularly those growing in containers, where root growth is restricted.
Some grubs pack a triple whammy. They infest plant roots. Predators shred the lawn for grubs. And those that become Japanese beetles ravage plants.
Most of their lives in these stages are spent underground, but adults have wings and disperse in the breeding season. They vary in their diet: some species are herbivores, mainly feeding on roots; others are omnivores, including worms and grubs in their diet; and a few are largely predatory.
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.
Adult chafers eat the leaves and flowers of many deciduous trees, shrubs, and other plants. However, white grubs (reaching 40–45 mm long when full grown) live in the soil and feed on plant roots, especially those of grasses and cereals, and are occasional pests in pastures, nurseries, gardens, and golf courses. An obvious indication of ...
[6] [7] [8] In Sri Lanka, grubs have been observed to feed on the tap roots of the teak seedlings, and finally the damaged plants wilt and die. [9] Grubs also can be removed from the cultivation land by cultural practises such as ploughing, harrowing, hoeing, flooding and fallowing of fields, trap cropping and crop rotation.
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