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Costelytra zealandica (commonly known as the grass grub) [1] is a species of scarab beetle found in forested areas of greater Wellington. [ 2 ] [ 3 ] It was originally described in 1846 by the British entomologist Adam White as Rhisotrogus zealandicus from a specimen obtained during the Ross expedition . [ 4 ]
This is the sole species in the genus Ostenia, is endemic to New Zealand and not much is known about its biology or ecology. [11] Diseases. Because grass grub build up large colonies in the soil, disease can spread quickly and be devastating to the population. The most common disease of the New Zealand Grass Grub is Amber disease.
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 grubs feed on mostly organic matter in the soil,” said Hudson. “The adult females lay their eggs in the soil with a lot of organic content. That’s primarily what the grubs will feed on.
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.
The cane beetle grub feeds on the roots of the sugarcane during all three stages of its life. The crucial stage occurs during February to May, when it aggressively feeds on the sugarcane's roots, causing the most damage to the plant. [1] Once it is fully fed, after 3–4 months, the grub burrows down to turn into a pupa.
Some species prey on root grubs. Chloropid flies assembling on a window. Flies of most of the species of Chloropidae commonly in grass. Some species will assemble in large numbers on trunks and branches of trees and shrubs, sometimes on plants in flower. They sometimes assemble in thousands on walls or windows.
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