Aphids
From Bugwoodwiki
Hagle, S.K; S. Tunnock; K.E. Gibson; and C.J. Gilligan. 1987. Field Guide to Diseases and Insect Pests of Idaho and Montana Forests. U.S. Department of Agriculture, Forest Service. State and Private Forestry, Northern Region. Missoula, Montana. Reprint 1990. Publication Number R1-89-54.
Contents |
Hosts
Most plant species may be hosts to aphids.
Distribution
Found throughout Idaho and Montana.
Damage
Aphids have piercing mouth parts through which they feed on sap from nearly all parts of host plants--foliage, buds, flowers, fruits, twigs, and roots. Damage on needles may result in necrotic spots similar to some diseases or feeding by other insects. They excrete a sticky substance known as "honeydew" which is fed upon by ants and other insects. It may also provide a growth mediumi for sooty mold.
Identification
Aphids are small, soft-bodied, usually gregarious insects (fig. 85). Color ranges from almost colorless to green, yellow, or black. Most of those seen are wingless; however, winged adults may be observed at various times during the summer. Presence of sticky exudate and a large number of ants probably indicate aphids are also present.
Similar damages
When severe, damage may resemble that caused by needle midges, other sucking insects, or needle diseases.
References
- Furniss, R. L., and V. M. Carolin. 1977. Western For. Insects. USDA Forest Serv., Misc. pub. 1339, 654 p., illus.
