Insect Management Handbook

Several species including
Oystershell scale (Lepidosaphes ulmi)
San Jose scale (Comstockaspis [Quadraspidiotus] perniciosus)

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

Image related to Hawthorn (Crataegus)-Pear sawfly (pear slug)

Includes

European (filbert) leafroller (Archips rosana)
Fruittree leafroller (Archips argyrospila)
Oblique-banded leafroller (Choristoneura rosaceana)
Pandemis leafroller (Pandemis pyrusana)

Enarmonia formosana

Acanthococcus (Eriococcus) azaleae

Image related to Hawthorn (Crataegus)-Azalea bark scale

Choreutis pariana

Image related to Hawthorn (Crataegus)-Apple-and-thorn skeletonizer

Tetranychus spp.

Image related to Golden chain (Laburnum)-Spider mite

Leucoptera laburnella

Image related to Golden chain (Laburnum)-Leafminer

Includes laburnum aphid (Aphis cytisorum) and other species

Gladiolus thrips (Thrips [Taeniothrips] simplex)