Insect Management Handbook

Hyphantria cunea

Tetranychus urticae

Halyomorpha halys

Rabdophaga rigidae

Leucoma salicis

Pest description and damage The adult moth (over 1-inch wingspan) is satiny white with black markings on the legs. The attractive larvae are approximately 2 inches in length when grown and reddish brown with double white dorsal patches and tufts of hairs along the sides. They can seriously skeletonize then defoliate cottonwood, poplar, and willow. They occasionally attack oak and aspen. Lombardy poplar and silver maple are particularly susceptible.

Cryptorhynchus lapathi

Hyphantria cunea

Numerous species

Numerous species

Pest description and damage Identification is important as root weevil species differ in susceptibility to pesticides and may have different life cycles. Adult weevils are dark colored, nocturnal beetles from 0.2 to 0.25 inch in length, with a snout (rostrum) and elbowed antennae. The tell-tale ragged notches are inconspicuous on juniper; however the weevils often girdle the twig, resulting in dead tips.

For biology, life history, monitoring and management

Numerous species

Pest description and damage Identification is important as each species differs in susceptibility to pesticides. Adult weevils are dark colored, nocturnal beetles from 0.2 to 0.25 inch in length, with a snout (rostrum) and elbowed antennae. Look for ragged notches on the edges of leaves, or flower petals. Larvae are C-shaped, legless, and white, sometimes reddish, with tan heads, up to 0.5 inch in size.

For biology, life history, monitoring and management