grub         die Larve Pl.: die Larven  - insbesondere eines Käfers

grub         die Made Pl.: die Maden

grub         der Engerling Pl.: die Engerlinge

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cockchafer grub [ZOOL.]         der Engerling Pl.: die Engerlinge

warble grub [BIOL.]         die Dassellarve Pl.: die Dassellarven

cock chafer grub         der Engerling Pl.: die Engerlinge

Dictionary: grub

https://www.google.com/search?q=%22cock+chafe...

Engerling, der

weiße, im Boden lebende Larve des Maikäfers, die Schaden verursacht

Engerling – Schreibung, Definition, Bedeutung, Etymologie, Synonyme, Beispiele | DWDS

Für die Larven / Engerlinge des Maikäfers (Melolontha melolontha) :

https://perfectgroundsolutions.co.uk/chafer-g...

 ... There are two main species of Chafer Grub that cause problems in turf and sports surfaces:

   Garden Chafer Grub (Phyllopertha horticola)

   Cock Chafer Grub (Melolontha melolontha)

The ones shown to the right are the garden Chafer which is much smaller than the Cock Chafer with the larvae growing to 15mm in length.

These will generally last for one season in the soil whereas the much larger Cock Chafer will last up to three years growing to quite a size (up to 30mm in length). ...

https://www.researchgate.net/figure/Cockchafe...

 ... Cockchafer grub (Melolontha melolontha) . The larvae of Melolotha hippocastani can be distinguished by the presence of numerous bristles around the anus (photo: Faber). ..

 ... The soil-dwelling larvae of several Scarabaeidae species (white grubs), like the cockchafer (Melolontha melolontha) and the garden chafer (Phyllopertha horticola), are serious pests in European cultivated grassland, reducing grass yield and destroying the turf by root-feeding. Nevertheless, the factors responsible ...