1984. Map of the Eugene Area gypsy moth trap catch. Red=3 or more moths caught; Green=1-2 moths caught; Yellow=No moths caught. Lane County, Oregon.
Map of the Eugene Area gypsy moth trap catch. Red=3 or more moths caught; Green=1-2 moths caught; Yellow=No moths caught. Lane County, Oregon.
Photo by: Unknown
Date: 1984
Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection.
Collection: FHP slide collection; Regional Office, Portland, Oregon.
The following is excerpted from The Gypsy Moth in Oregon (1986), by the Oregon Department of Agriculture:
"The first established infestation of gypsy moths was discovered in Salem, Oregon in 1981. Over 1,000 male moths and 400 egg masses were found in a 20 square mile area. A 4,000 acre area, encompassing all of the egg mass detections was sprayed with carbaryl in the spring of 1982. About 200 moths were traped outside the spray area following the eradications program. In 1983, delimination trapping was used in the area to pinpoint the residual population. This was followed by a second eradication spray program in 1984 using Bacillus thuringiensis (B.t.) on 8,470 acres where the residual population had established. The 1985 trapping results show that the Salem infestation is virtually eliminated. Established infestations of gypsy moths were also detected in 1983 in Corvallis, Gresham, and two sites in west Portland. An eradication spray program using B.t. was conducted in each aera in 1984 followed by mass trapping in the core area of each spray block. No moths were caught in any of these areas in 1985. ...
In 1984, four new gypsy moth infestations were uncovered. Three were small localized infestations in urban areas with a history of gypsy moth catches. The fourth infestation was considerably larger covering about 1,200 square miles of Land County and represnts the largest gypsy moth infestation in the western United States. ...
The Lane County infestation discovered in 1984 actually consists of three major infestation sites with a scattering of moth detections at low numbers for several miles around each site. The infestation centers were located near Franklin along Territorial Road, at Hawkins Heights in Eugene, and near Cedar Hills Road in Pleasant Hill. Moth catches in these areas ranted from 20-900 per trap site and egg mass densities ranged between 50-1,000 per acre. The infestation center near Cedar Hills Road appears to be the oldest and may have been present for several years. This site is in a rural area not routinely surveyed for gypsy moths due to the lower probability of moth introduction there. However, Highway 58 is routinely surveyed, and although the Cedar Hills area is only two miles south of it, traps along Highway 58 remained negative unti 1984. A few moths were detected in Lowell just east of the infestation center in 1982 and 1983, but extensive trapping and egg mass searching revealed no infestation prior to 1984. That year the gypsy moth population in the area underwent a tremendous increase, expanding into the urban and recreational areas which ere regularly surveyed. Escalation of the trapping program into the rural and forested areas surrounding the original introduction site revealed the exten of this expansion. Nearly 16,000 male moths were caught in or near the communities of Pleasant Hill, Dexter, Lowell, Lost Creek, Jasper, Fall Creek, Westfir, and Oakridge. An additional 111 males were caught near Dorena Lake, Creswell, Cottage Grove, and Cottage Grove Lake. With the exception of Lowell, no gypsy moths were caught in the above communities prior to 1984. ..."
For more see: library.state.or.us/repository/2014/201406031136162/index...
Image provided by USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection: www.fs.usda.gov/main/r6/forest-grasslandhealth
1984. Map of the Eugene Area gypsy moth trap catch. Red=3 or more moths caught; Green=1-2 moths caught; Yellow=No moths caught. Lane County, Oregon.
Map of the Eugene Area gypsy moth trap catch. Red=3 or more moths caught; Green=1-2 moths caught; Yellow=No moths caught. Lane County, Oregon.
Photo by: Unknown
Date: 1984
Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection.
Collection: FHP slide collection; Regional Office, Portland, Oregon.
The following is excerpted from The Gypsy Moth in Oregon (1986), by the Oregon Department of Agriculture:
"The first established infestation of gypsy moths was discovered in Salem, Oregon in 1981. Over 1,000 male moths and 400 egg masses were found in a 20 square mile area. A 4,000 acre area, encompassing all of the egg mass detections was sprayed with carbaryl in the spring of 1982. About 200 moths were traped outside the spray area following the eradications program. In 1983, delimination trapping was used in the area to pinpoint the residual population. This was followed by a second eradication spray program in 1984 using Bacillus thuringiensis (B.t.) on 8,470 acres where the residual population had established. The 1985 trapping results show that the Salem infestation is virtually eliminated. Established infestations of gypsy moths were also detected in 1983 in Corvallis, Gresham, and two sites in west Portland. An eradication spray program using B.t. was conducted in each aera in 1984 followed by mass trapping in the core area of each spray block. No moths were caught in any of these areas in 1985. ...
In 1984, four new gypsy moth infestations were uncovered. Three were small localized infestations in urban areas with a history of gypsy moth catches. The fourth infestation was considerably larger covering about 1,200 square miles of Land County and represnts the largest gypsy moth infestation in the western United States. ...
The Lane County infestation discovered in 1984 actually consists of three major infestation sites with a scattering of moth detections at low numbers for several miles around each site. The infestation centers were located near Franklin along Territorial Road, at Hawkins Heights in Eugene, and near Cedar Hills Road in Pleasant Hill. Moth catches in these areas ranted from 20-900 per trap site and egg mass densities ranged between 50-1,000 per acre. The infestation center near Cedar Hills Road appears to be the oldest and may have been present for several years. This site is in a rural area not routinely surveyed for gypsy moths due to the lower probability of moth introduction there. However, Highway 58 is routinely surveyed, and although the Cedar Hills area is only two miles south of it, traps along Highway 58 remained negative unti 1984. A few moths were detected in Lowell just east of the infestation center in 1982 and 1983, but extensive trapping and egg mass searching revealed no infestation prior to 1984. That year the gypsy moth population in the area underwent a tremendous increase, expanding into the urban and recreational areas which ere regularly surveyed. Escalation of the trapping program into the rural and forested areas surrounding the original introduction site revealed the exten of this expansion. Nearly 16,000 male moths were caught in or near the communities of Pleasant Hill, Dexter, Lowell, Lost Creek, Jasper, Fall Creek, Westfir, and Oakridge. An additional 111 males were caught near Dorena Lake, Creswell, Cottage Grove, and Cottage Grove Lake. With the exception of Lowell, no gypsy moths were caught in the above communities prior to 1984. ..."
For more see: library.state.or.us/repository/2014/201406031136162/index...
Image provided by USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection: www.fs.usda.gov/main/r6/forest-grasslandhealth