Insect Management Handbook

(Dynaspidiotus californicus) (formerly Nuculaspis californica)

Lecanium scale (Parentholecanium spp.)
Oystershell scale (Lepidosaphes ulmi)
San Jose scale (Comstockaspis [Quadraspidiotus] perniciosus)

Numerous species

Pest description and damage Species identification is important as root weevil species differ in susceptibility to pesticides and can 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. Larvae are rarely a problem in landscapes. Look for ragged notches on the edges of leaves, or flower petals or dead tips of plants where weevils have girdled the twig.

Enarmonia formosana

Includes melon aphid (Aphis gossypii) and others

Forest tent caterpillar (Malacosoma disstria)
Western tent caterpillar (Malacosoma californica)

Image related to Pear, flowering (Pyrus)-Tent caterpillar

Comstockaspis (Quadraspidiotus) perniciosus

California pear sawfly (Pristiphora abbreviata)
Pear slug (Caliroa cerasi)

Image related to Pear, flowering (Pyrus)-Pear sawfly (pear slug)

Eriophyes (Phytoptus) pyri

Lepidosaphes ulmi

Image related to Pear, flowering (Pyrus)-Oystershell scale