The walnut twig beetle is a member of the family of Curculionidae beetles. As its name suggests, it is known for feeding on several species of walnut trees.
Size: 1.5 to 1.9 mm
Color: These beetles mostly have a reddish-brown body.
Other Characteristic Features: They are small in size, with their prothorax being broken and ragged.
The larvae are white and C-shaped, also having a brown head capsule, devoid of any legs. They can be found in the phloem of the host plant.
After maturing, the larvae begin to pupate.
Eggs are laid in galleries that are horizontal across the grain.
| Lifespan | 7 weeks |
| Distribution | United States; primarily Arizona and New Mexico |
| Habitat | Regions with cold climes |
| Seasons active | May- June; September-October |
| Host plants | Butternut, walnut, or wingnut |
| Diet of adults | Same as host plant |
These beetles make galleries in the host plant by burrowing into the bark. In later stages, these galleries increase in size and spread apart by 2-5 cm, essentially stunting further growth of the tree.
Image Source:
The walnut twig beetle is a member of the family of Curculionidae beetles. As its name suggests, it is known for feeding on several species of walnut trees.
Size: 1.5 to 1.9 mm
Color: These beetles mostly have a reddish-brown body.
Other Characteristic Features: They are small in size, with their prothorax being broken and ragged.
The larvae are white and C-shaped, also having a brown head capsule, devoid of any legs. They can be found in the phloem of the host plant.
After maturing, the larvae begin to pupate.
Eggs are laid in galleries that are horizontal across the grain.
| Lifespan | 7 weeks |
| Distribution | United States; primarily Arizona and New Mexico |
| Habitat | Regions with cold climes |
| Seasons active | May- June; September-October |
| Host plants | Butternut, walnut, or wingnut |
| Diet of adults | Same as host plant |
These beetles make galleries in the host plant by burrowing into the bark. In later stages, these galleries increase in size and spread apart by 2-5 cm, essentially stunting further growth of the tree.
Image Source:
