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The grub stage is considered as a serious pest on sugarcane where they can be controlled by management of using cultural, mechanical, biological, chemical and integrated methods. [ citation needed ] In biological method, grubs can be destroy by using the parasitoid fungus Metarhizium anisopliae . [ 3 ]
Disease symptoms are yellowed or dead leaves, reduced root system and finally dieback of the whole plant. White grubs mainly affect young tea plants. During dry weather, roots are infested with large number of grubs and leave calloused stumps. [2] [3] They also feeds on the bark at soil level which can be seen as ring-barking of the stem. In ...
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.
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 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.
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 ...
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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.
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