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Grubs of this species, which reach 40–45 mm long when fully 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 in grassy amenity areas like golf-courses. The grubs can be found immediately below the surface, usually lying in a characteristic ...
In late autumn and during winter, they retreat down from the top 5 cm of soil and burrow down between 50–200 mm into the soil. During this phase, the grubs undergo a colour change from grayish/white into a yellow/cream colour. Once they reach the appropriate depth, the grub empties its stomach and starts to form a smooth oval shaped cell.
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 adult beetles are harmless, but the grubs feed on the roots of grasses (and sometimes other plants) and cause much damage. During wet periods, the grasses can keep growing new shoots and may look healthy, but in dry conditions, the plants cannot obtain enough moisture, become desiccated, turn brown and die.
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 infestation is the presence of birds, such as crows, peeling back the grass to get to the grubs.
Female known to lay eggs in soil during early part of the monsoon season between May and August. Eggs hatch after 8 to 14 days in soil. [5] Larvae can be seen in around a week and started to feed on roots. During drought periods, larvae move deeper in the soil where the come closer to the surface during wet periods.
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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 people; and milky spore, like other bacteria, is highly survivable in drought conditions but suffers in temperatures of Zone 5 and colder.