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• 171. [Article] Incidence of wood borer activity in green ash windbreak plantings in North Dakota

  An evaluation was made during midsummer 1972 to measure damage by the carpenterworm, Prionoxystus robiniae, and the ash borer, Podosesia syringae, to green ash in windbreaks in North Dakota. Intensity ...

  Citation × Citation Citation Abstract Copy Title: Incidence of wood borer activity in green ash windbreak plantings in North Dakota Author: United States. Forest Service. Northern Region. State & Private Forestry, Tagestad, Arden, Tunnock, Scott An evaluation was made during midsummer 1972 to measure damage by the carpenterworm, Prionoxystus robiniae, and the ash borer, Podosesia syringae, to green ash in windbreaks in North Dakota. Intensity of infestation was determined in four land resource areas and four age classes of windbreaks. Of the 96 windbreaks examined Statewide, the ash borer was present in 51 percent and the carpenterworm in 28.1 percent. The carpenterworm predominated in trees older than 16 years, and the ash borer was more prevalent in trees under 15 years old. Damage by borers was greatest in the southwestern quarter of North Dakota where the carpenterworm had attacked 23.4 percent of the trees and the ash borer 7.2 percent. Damage by borers was negligible in the remainder of the State. The carpenterworm can be considered a minor problem in the eastern half of North Dakota. However, the presence of the ash borer in more than half the windbreaks sampled Statewide makes this insect a potential threat to their management. Control measures are available and should be applied where owners are concerned. Title: Incidence of wood borer activity in green ash windbreak plantings in North Dakota Author: United States. Forest Service. Northern Region. State & Private Forestry, Tagestad, Arden, Tunnock, Scott An evaluation was made during midsummer 1972 to measure damage by the carpenterworm, Prionoxystus robiniae, and the ash borer, Podosesia syringae, to green ash in windbreaks in North Dakota. Intensity of infestation was determined in four land resource areas and four age classes of windbreaks. Of the 96 windbreaks examined Statewide, the ash borer was present in 51 percent and the carpenterworm in 28.1 percent. The carpenterworm predominated in trees older than 16 years, and the ash borer was more prevalent in trees under 15 years old. Damage by borers was greatest in the southwestern quarter of North Dakota where the carpenterworm had attacked 23.4 percent of the trees and the ash borer 7.2 percent. Damage by borers was negligible in the remainder of the State. The carpenterworm can be considered a minor problem in the eastern half of North Dakota. However, the presence of the ash borer in more than half the windbreaks sampled Statewide makes this insect a potential threat to their management. Control measures are available and should be applied where owners are concerned. Close

• 172. [Article] Status of mountain pine beetle infestations on the Superior Ranger District, Lolo National Forest, St. Regis, Montana

  A mountain pine beetle infestation has been active in the St. Regis area since 1964. Heaviest tree mortality occurred during the period 1969-70. The infestation has continued to decline since 1970. Over 2 ...

  Citation × Citation Citation Abstract Copy Title: Status of mountain pine beetle infestations on the Superior Ranger District, Lolo National Forest, St. Regis, Montana Author: United States. Forest Service. Northern Region. State & Private Forestry, McGregor, Mark D. A mountain pine beetle infestation has been active in the St. Regis area since 1964. Heaviest tree mortality occurred during the period 1969-70. The infestation has continued to decline since 1970. Over 2 million board feet of lodgepole and ponderosa pine were killed during the outbreak. Overstocking resulted in slow growth which probably promoted a general weakening of the stand, making some trees more susceptible to attack by mountain pine beetle. Two factors that might be contributing to the decline of the outbreak are: 1. The influence of Ips spp. drying out the cambial area in infested trees. 2. The average size of trees being attacked is less than 10 inches d.b.h., resulting in fewer beetles emerging from infested trees than parent adults that attacked. Title: Status of mountain pine beetle infestations on the Superior Ranger District, Lolo National Forest, St. Regis, Montana Author: United States. Forest Service. Northern Region. State & Private Forestry, McGregor, Mark D. A mountain pine beetle infestation has been active in the St. Regis area since 1964. Heaviest tree mortality occurred during the period 1969-70. The infestation has continued to decline since 1970. Over 2 million board feet of lodgepole and ponderosa pine were killed during the outbreak. Overstocking resulted in slow growth which probably promoted a general weakening of the stand, making some trees more susceptible to attack by mountain pine beetle. Two factors that might be contributing to the decline of the outbreak are: 1. The influence of Ips spp. drying out the cambial area in infested trees. 2. The average size of trees being attacked is less than 10 inches d.b.h., resulting in fewer beetles emerging from infested trees than parent adults that attacked. Close

• 173. [Article] A survey to evaluate wood borers in green ash windbreaks in North Dakota

  Green ash windbreaks in North Dakota were surveyed in 1972 and 1976 to determine the incidence of attacks by the carpenterworm, ash borer, and other stem-infesting wood borers. Windbreaks were stratified ...

  Citation × Citation Citation Abstract Copy Title: A survey to evaluate wood borers in green ash windbreaks in North Dakota Author: United States. Forest Service. Northern Region. State & Private Forestry, Flavell, Thomas H., United States. Forest Service. Northern Region. Forest Insect and Disease Management Green ash windbreaks in North Dakota were surveyed in 1972 and 1976 to determine the incidence of attacks by the carpenterworm, ash borer, and other stem-infesting wood borers. Windbreaks were stratified by age and geographic region. In 1976, about 3.1 percent of the green ash trees in North Dakota had new carpenterworm attacks, an increase of 34.8 percent from 1972. The number of trees showing new attacks by the ash borer declined in three out of four land resource areas (LRA). Trees damaged by other borers declined in all LRA's but one. Although some LRA's showed minor increases, the number of windbreaks infested by the carpenterworm and ash borer declined by 41.6 percent and 19.6 percent respectively. Younger windbreaks were apparently more susceptible to attack by ash borers while older ones were more frequently infested by the carpenterworm and other borers. Title: A survey to evaluate wood borers in green ash windbreaks in North Dakota Author: United States. Forest Service. Northern Region. State & Private Forestry, Flavell, Thomas H., United States. Forest Service. Northern Region. Forest Insect and Disease Management Green ash windbreaks in North Dakota were surveyed in 1972 and 1976 to determine the incidence of attacks by the carpenterworm, ash borer, and other stem-infesting wood borers. Windbreaks were stratified by age and geographic region. In 1976, about 3.1 percent of the green ash trees in North Dakota had new carpenterworm attacks, an increase of 34.8 percent from 1972. The number of trees showing new attacks by the ash borer declined in three out of four land resource areas (LRA). Trees damaged by other borers declined in all LRA's but one. Although some LRA's showed minor increases, the number of windbreaks infested by the carpenterworm and ash borer declined by 41.6 percent and 19.6 percent respectively. Younger windbreaks were apparently more susceptible to attack by ash borers while older ones were more frequently infested by the carpenterworm and other borers. Close

• 174. [Article] An evaluation of cone and seed insects in selected seed production areas in Region 1 : progress report II

  Insect damage was extensive to Douglas-fir, ponderosa pine, western white pine, and western larch cones at most seed production areas surveyed in 1979. From 70 to 100 percent of the cones from several ...

  Citation × Citation Citation Abstract Copy Title: An evaluation of cone and seed insects in selected seed production areas in Region 1 : progress report II Author: Dewey, Jerald E., United States. Forest Service. Northern Region. State & Private Forestry, Jenkins, Michael J. Insect damage was extensive to Douglas-fir, ponderosa pine, western white pine, and western larch cones at most seed production areas surveyed in 1979. From 70 to 100 percent of the cones from several collecting periods were injured. Moderate damage (40-70 percent of cones injured) occurred to Douglas-fir, ponderosa pine, western larch, and western white pine from a few areas. Light damage (less than 40 percent) occurred on western white pine cones from a few seed production areas, and to all lodgepole pine and western hemlock cones collected. The primary insect species observed were western spruce budworm on Douglas-fir and western larch; midges on Douglas-fir, western larch, ponderosa pine, and lodgepole pine; cone worms on Douglas-fir, western larch, and ponderosa pine; and the Douglas-fir cone moth on Douglas-fir. Title: An evaluation of cone and seed insects in selected seed production areas in Region 1 : progress report II Author: Dewey, Jerald E., United States. Forest Service. Northern Region. State & Private Forestry, Jenkins, Michael J. Insect damage was extensive to Douglas-fir, ponderosa pine, western white pine, and western larch cones at most seed production areas surveyed in 1979. From 70 to 100 percent of the cones from several collecting periods were injured. Moderate damage (40-70 percent of cones injured) occurred to Douglas-fir, ponderosa pine, western larch, and western white pine from a few areas. Light damage (less than 40 percent) occurred on western white pine cones from a few seed production areas, and to all lodgepole pine and western hemlock cones collected. The primary insect species observed were western spruce budworm on Douglas-fir and western larch; midges on Douglas-fir, western larch, ponderosa pine, and lodgepole pine; cone worms on Douglas-fir, western larch, and ponderosa pine; and the Douglas-fir cone moth on Douglas-fir. Close

• 175. [Article] Potential for defoliation by Douglas-fir tussock moth in western Montana in 1974

  In 1973, two centers of defoliation by Douglas-fir tussock moth totaling 350 acres were detected near Missoula, Montana. Egg mass surveys showed two sections south of Frenchtown and one section northwest ...

  Citation × Citation Citation Abstract Copy Title: Potential for defoliation by Douglas-fir tussock moth in western Montana in 1974 Author: United States. Forest Service. Northern Region. State & Private Forestry, Kohler, Steve, Tunnock, Scott In 1973, two centers of defoliation by Douglas-fir tussock moth totaling 350 acres were detected near Missoula, Montana. Egg mass surveys showed two sections south of Frenchtown and one section northwest of Lolo 41, contain sufficient egg mass population to cause heavy defoliation in 1974. Title: Potential for defoliation by Douglas-fir tussock moth in western Montana in 1974 Author: United States. Forest Service. Northern Region. State & Private Forestry, Kohler, Steve, Tunnock, Scott In 1973, two centers of defoliation by Douglas-fir tussock moth totaling 350 acres were detected near Missoula, Montana. Egg mass surveys showed two sections south of Frenchtown and one section northwest of Lolo 41, contain sufficient egg mass population to cause heavy defoliation in 1974. Close

• 176. [Article] Succession functions of forest pathogens and insects : ecosections M332a and M333d in northern Idaho and western Montana. Volume 1: Analysis Methods

  Citation × Citation Citation Abstract Copy Title: Succession functions of forest pathogens and insects : ecosections M332a and M333d in northern Idaho and western Montana. Volume 1: Analysis Methods Author: United States. Forest Service. Northern Region. State & Private Forestry, United States. Forest Health Protection, Hagle, Susan K. Title: Succession functions of forest pathogens and insects : ecosections M332a and M333d in northern Idaho and western Montana. Volume 1: Analysis Methods Author: United States. Forest Service. Northern Region. State & Private Forestry, United States. Forest Health Protection, Hagle, Susan K. Close

• 177. [Article] Effect of thinning second-growth ponderosa pine on incidence of mountain pine beetle infestation : establishment report

  Citation × Citation Citation Abstract Copy Title: Effect of thinning second-growth ponderosa pine on incidence of mountain pine beetle infestation : establishment report Author: McGregor, Mark D., United States. Forest Service. Northern Region. State & Private Forestry Title: Effect of thinning second-growth ponderosa pine on incidence of mountain pine beetle infestation : establishment report Author: McGregor, Mark D., United States. Forest Service. Northern Region. State & Private Forestry Close

• 178. [Article] Effect of thinning second-growth ponderosa pine stands on incidence of mountain pine beetle infestation : progress report

  Citation × Citation Citation Abstract Copy Title: Effect of thinning second-growth ponderosa pine stands on incidence of mountain pine beetle infestation : progress report Author: McGregor, Mark D., United States. Forest Service. Northern Region. State & Private Forestry Title: Effect of thinning second-growth ponderosa pine stands on incidence of mountain pine beetle infestation : progress report Author: McGregor, Mark D., United States. Forest Service. Northern Region. State & Private Forestry Close

• 179. [Article] Evaluation of a pine engraver beetle infestation, Sandpoint District, Idaho Panhandle National Forests, 1974

  An outbreak of the pine engraver Ips pini (Say), was reported by Sonny LaSalle, Forester, in a mixed second-growth Douglas-fir,lodgepole, ponderosa pine stand on the Sandpoint Ranger District near Edgemere, Idaho. ...

  Citation × Citation Citation Abstract Copy Title: Evaluation of a pine engraver beetle infestation, Sandpoint District, Idaho Panhandle National Forests, 1974 Author: McGregor, Mark D., United States. Forest Service. Northern Region. State & Private Forestry An outbreak of the pine engraver Ips pini (Say), was reported by Sonny LaSalle, Forester, in a mixed second-growth Douglas-fir,lodgepole, ponderosa pine stand on the Sandpoint Ranger District near Edgemere, Idaho. This report was received in early January 1974. An evaluation of the infestation was made April 18, 1974. Title: Evaluation of a pine engraver beetle infestation, Sandpoint District, Idaho Panhandle National Forests, 1974 Author: McGregor, Mark D., United States. Forest Service. Northern Region. State & Private Forestry An outbreak of the pine engraver Ips pini (Say), was reported by Sonny LaSalle, Forester, in a mixed second-growth Douglas-fir,lodgepole, ponderosa pine stand on the Sandpoint Ranger District near Edgemere, Idaho. This report was received in early January 1974. An evaluation of the infestation was made April 18, 1974. Close

• 180. [Article] Nursery conifer diseases : evaluation of Benomyl to control root disease of Engelmann spruce seedlings

  The benomyl fungicide, rersan, applied at 7 and 14 pounds active ingredient per acre, on April 26 and July 25, 1973, was ineffective in reducing mortality in 2-0 Engelmann spruce seedlings derived from ...

  Citation × Citation Citation Abstract Copy Title: Nursery conifer diseases : evaluation of Benomyl to control root disease of Engelmann spruce seedlings Author: United States. Forest Service. Northern Region. State & Private Forestry, Williams, Ralph E. The benomyl fungicide, rersan, applied at 7 and 14 pounds active ingredient per acre, on April 26 and July 25, 1973, was ineffective in reducing mortality in 2-0 Engelmann spruce seedlings derived from two different seed sources growing in three different nursery sections at the USFS Coeur d'Alene Nursery. Percent mortality in plots monitored over the entire summer was 8.6, 3.6 and 8.0 in sections 31, 36, and 37 respectively, and ranged from 0 to as high as 21.9 in individual mortality plots. Percent mortality in sections 31 and 37 was similar and significantly greater than in section 36, indicating variation in conditions associated with individual sections. Percent mortality combined for sections 36 and 37 (seed source 72-180) was significantly less than that for section 31 (seed source 72-144) indicating variation in host or seed lot susceptibility or tolerance. Higher rates of application, 28 and 42 pounds active per acre, applied during a second treatment period were ineffective. Because of experimental design inadequacies, however, the results are inconclusive. Bioassay studies to determine chemical distribution in soil and within seedlings were generally negative. Reasons for lack of control and negative assays are discussed. Isolation studies did reveal a high frequency of occurrence of Fusariuin spp. in dead seedlings, and disease expression increased with increasing summer temperatures, implicating fusarial pathogens in the causal complex. Title: Nursery conifer diseases : evaluation of Benomyl to control root disease of Engelmann spruce seedlings Author: United States. Forest Service. Northern Region. State & Private Forestry, Williams, Ralph E. The benomyl fungicide, rersan, applied at 7 and 14 pounds active ingredient per acre, on April 26 and July 25, 1973, was ineffective in reducing mortality in 2-0 Engelmann spruce seedlings derived from two different seed sources growing in three different nursery sections at the USFS Coeur d'Alene Nursery. Percent mortality in plots monitored over the entire summer was 8.6, 3.6 and 8.0 in sections 31, 36, and 37 respectively, and ranged from 0 to as high as 21.9 in individual mortality plots. Percent mortality in sections 31 and 37 was similar and significantly greater than in section 36, indicating variation in conditions associated with individual sections. Percent mortality combined for sections 36 and 37 (seed source 72-180) was significantly less than that for section 31 (seed source 72-144) indicating variation in host or seed lot susceptibility or tolerance. Higher rates of application, 28 and 42 pounds active per acre, applied during a second treatment period were ineffective. Because of experimental design inadequacies, however, the results are inconclusive. Bioassay studies to determine chemical distribution in soil and within seedlings were generally negative. Reasons for lack of control and negative assays are discussed. Isolation studies did reveal a high frequency of occurrence of Fusariuin spp. in dead seedlings, and disease expression increased with increasing summer temperatures, implicating fusarial pathogens in the causal complex. Close