Conifer Pests Conifer Pests Included in this section are pests that infest arborvitae, cedar, deodar cedar, fir, hemlock, juniper, pine, and spruce in nurseries and in the landscape.
Conifers form a major portion of the shrubs grown by commercial nurserymen.
With their amazing variety of forms and shades of green and yellow, conifers are among the most important landscape plants. Although conifers generally require little care, they are occasionally damaged or killed by insects and spider mites in the landscape. Introduced pine sawfly -Colonies of grayish caterpillars with rows of black and yellow spots on sides feed on white and Virginia pines. Heavily infested trees may be defoliated. Most noticeable in late winter and spring.