Western Spruce Budworm

Lepidoptera: Tortricidae Choristoneura occidentalis Freedman
 

adult 1 adult 2 adult 3 defoliation 1
Adult
Douglas-fir		 Adult
Douglas-fir
B.B. Hostetler		 Green form adult
white fir
July 1960
W.C. Guy		 Larvae & defoliation
white fir
Malheur NF, OR
1985

I.R. Ragenovich
larva on shoot sixth instar 1 sixth instar 2 defoliation 2
Larva on shoot
Douglas-fir
Mt. Hood NF, OR
June 1956
V.M. Carolin, R.B. Hope		 Sixth-instar larva Sixth-instar larva
white fir
Santa Fe NF, NM		 Defoliation
defoliation 3 defoliation 4 defoliation 5 defoliation 6
Defoliation
Santiam Pass
Willamette NF, OR		 Defoliation Defoliation
Umatilla NF, OR		 Defoliation
insecticide application larva defoliation 7 topkill
Insecticide application by helicopter
Mt. Hood NF, OR
July 1989
W.M. Ciesla		 Larva hanging by silk strand 100% defoliation for 2 years
Malheur NF, OR
1983
D.B. Twardus		 Topkill
defoliation 8 defoliation 9 defoliation 10 eggs
Defoliation Defoliation
Ochoco NF, OR
W.M. Ciesla		 Defoliation
Deschutes NF, OR
1992
A. Eglitis		 Eggs
R.E. Sandquist
fifth instar
Fifth-instar larva
A. Eglitis

This webpage was reformatted on May 27, 2008.