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Maladera formosae, commonly known as the Asiatic garden beetle and formerly known as Maladera castanea, is a species of beetle in the family Scarabaeidae.It is native to Japan, China, South Korea, North Korea, and Russia but was introduced to North America in the 1920s where it is considered a pest of turfs, gardens, and crop fields.
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. Vigorous feeding occurs from March through May.
Costelytra giveni is endemic to and found throughout New Zealand. There are, however, similar species found in other countries like Acrossidius tasmaniae, the Tasmanian grass grub found in Tasmania, Australia. Grass grubs prefer altitudes below 1200m, with favored soil types being free-draining loam soils, but they are also found in peaty or ...
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 ...
These grubs live in trees. They can also be found in black wattle trees, and are considered to be the reason why wattles die within 10 to 15 years. The roots of the Acacia kempeana shrub are another source of the grubs. [11] When held, as a defence mechanism, the grubs will secrete a brown liquid. [3]
Holotrichia is a genus of beetle in the family Scarabaeidae, which are well known as "chafer beetles" or "white-grubs" for their white larvae that are found under the soil where they feed on the roots of plants.
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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.