Defoliating Insect Images
Many species of insects feed on plant foliage. By feeding on leaves, defoliating insects decrease or eliminate a tree's photosynthetic capability, limiting growth. In severe cases of defoliation, tree mortality may result. Two of the most destructive defoliators are the Douglas-fir tussock moth and the western spruce budworm. Douglas-fir tussock moth larvae feed on new foliage as early instars, moving to older foliage as they mature. Complete defoliation and tree mortality can result in a single season from extreme tussock moth outbreaks. Severe attacks by spruce budworm over several seasons will cause complete defoliation, resulting in growth loss, top-kill, and eventual mortality. Symptoms of infestation vary with defoliating species, and may include the presence of larvae, and of egg masses on foliage or branches. Loss of foliage, holes in foliage, or skeletonizing of leaves are other indicators.
Giant conifer Aphid, Adult, Infestation
Oystershell Scale, Infestation
Giant conifer aphid (Adult)
Douglas-fir tussock
moth (Adult)
Douglas-fir tussock
moth (Adult)
Douglas-fir tussock moth (Adult)
Douglas-fir tussock
moth (Eggs)
Douglas-fir tussock
moth (Larvae)
Douglas-fir tussock
moth (Larvae)
Douglas-fir tussock
moth (Pupae)
Douglas-fir tussock
moth
(Damage - close)
(Damage - close)
Douglas-fir tussock
moth
(Damage - far)
(Damage - far)
Douglas-fir tussock moth
(Damage - far)
Douglas-fir tussock moth(Damage - far)
Pandora moth (Adult)
Pandora moth (Eggs)
Pandora moth (Larvae)
Pandora moth (Larvae)
Pandora moth (Pupae)
Pandora Moth (Damage)
Western pine tip moth
(Adult)
Western spruce budworm (Adult)
Western spruce budworm
(Larvae)
Western
spruce budworm (Larvae)
Western
spruce budworm (Pupae)
Western
spruce budworm (Pupae)
Western
spruce budworm
(Damage - close)
(Damage - close)
Western
spruce budworm
(Damage - far)
(Damage - far)
Western spruce budworm
(Damage - far)
(Damage - far)
Western tent caterpillar (Adult)
Western tent caterpillar (Eggs)
Western tent caterpillar
(Larvae)
Cooley spruce gall adelgid (Adult)
Cooley
spruce gall adelgid (Larvae)
Western tent caterpillar (Damage)
Cooley spruce gall adelgid
(Damage - close)
(Damage - close)
Cooley spruce gall adelgid (Adult-alate stage)
Cooley spruce gall adelgid (damage)
| Last Reviewed and Updated: March 24, 2004 Questions/Comments:azfh@cals.arizona.edu |
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