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• 1. [Article] Evaluation of mountain pine beetle infestations, Gallatin Ranger District, Gallatin National Forest, Montana, 1975

  Mountain pine beetle has occurred at epidemic level in lodgepole pine stands in the west Gallatin River drainage since 1969. Infestation now encompasses about 5,500 acres. Since 1969, approximately 463,212 ...

  Citation × Citation Citation Abstract Copy Title: Evaluation of mountain pine beetle infestations, Gallatin Ranger District, Gallatin National Forest, Montana, 1975 Author: United States. Forest Service. Northern Region. State & Private Forestry, Lood, Rudolph C., Hamel, Dennis R., McGregor, Mark D. Mountain pine beetle has occurred at epidemic level in lodgepole pine stands in the west Gallatin River drainage since 1969. Infestation now encompasses about 5,500 acres. Since 1969, approximately 463,212 trees, with an estimated volume of 20,529,244 board feet have been killed. Approximately 69 percent of the stands on the Gallatin District are classed as susceptible. It is predicted that about 927,781 trees will be killed in 1976. Selective logging to remove infested and susceptible trees is recommended to reduce the potential for a continued epidemic. Title: Evaluation of mountain pine beetle infestations, Gallatin Ranger District, Gallatin National Forest, Montana, 1975 Author: United States. Forest Service. Northern Region. State & Private Forestry, Lood, Rudolph C., Hamel, Dennis R., McGregor, Mark D. Mountain pine beetle has occurred at epidemic level in lodgepole pine stands in the west Gallatin River drainage since 1969. Infestation now encompasses about 5,500 acres. Since 1969, approximately 463,212 trees, with an estimated volume of 20,529,244 board feet have been killed. Approximately 69 percent of the stands on the Gallatin District are classed as susceptible. It is predicted that about 927,781 trees will be killed in 1976. Selective logging to remove infested and susceptible trees is recommended to reduce the potential for a continued epidemic. Close

• 2. [Article] Dipel wettable powder (Bacillus thuringiensis Berliner) as a control agent for western spruce budworm Choristoneura occidentalis Free

  Dipel (R) was applied by helicopter to three blocks of Douglasfir and Engelmann spruce infested with Choristoneura occidentalis Free., in southwestern Montana. Dosage was 1 pound (7.2 Bill) in 2 gallons ...

  Citation × Citation Citation Abstract Copy Title: Dipel wettable powder (Bacillus thuringiensis Berliner) as a control agent for western spruce budworm Choristoneura occidentalis Free Author: United States. Forest Service. Northern Region. State & Private Forestry, Lood, Rudolph C., Hamel, Dennis R., McGregor, Mark D. Dipel (R) was applied by helicopter to three blocks of Douglasfir and Engelmann spruce infested with Choristoneura occidentalis Free., in southwestern Montana. Dosage was 1 pound (7.2 Bill) in 2 gallons of water/acre (453 g in 7.5 t/0.4 ha). A commercial surfactant, Bio-film (R) was added at the rate of 16 oz./100 gal. (453 g/378.5 £) of spray. Rhodamine B extra S dye was added at the rate of 1.25 g/i. Dipel was applied to mainly third and fourth instar budworm. Mortality, corrected by covariance analysis, at 21-day postspray counts indicated an average of 50.4 percent control. Additional mortality further reduced the population to an estimated 4.4 budworm/100 buds compared to 12 budworm/100 buds in check blocks. Foliage protection was 5.6 percent. Significant parasite population disruptions occurred following spray application. Title: Dipel wettable powder (Bacillus thuringiensis Berliner) as a control agent for western spruce budworm Choristoneura occidentalis Free Author: United States. Forest Service. Northern Region. State & Private Forestry, Lood, Rudolph C., Hamel, Dennis R., McGregor, Mark D. Dipel (R) was applied by helicopter to three blocks of Douglasfir and Engelmann spruce infested with Choristoneura occidentalis Free., in southwestern Montana. Dosage was 1 pound (7.2 Bill) in 2 gallons of water/acre (453 g in 7.5 t/0.4 ha). A commercial surfactant, Bio-film (R) was added at the rate of 16 oz./100 gal. (453 g/378.5 £) of spray. Rhodamine B extra S dye was added at the rate of 1.25 g/i. Dipel was applied to mainly third and fourth instar budworm. Mortality, corrected by covariance analysis, at 21-day postspray counts indicated an average of 50.4 percent control. Additional mortality further reduced the population to an estimated 4.4 budworm/100 buds compared to 12 budworm/100 buds in check blocks. Foliage protection was 5.6 percent. Significant parasite population disruptions occurred following spray application. Close

• 3. [Article] Natural mortality in a Douglas-fir tussock moth infestation in Idaho, 1974

  Mortality from various causes was recorded in a Douglas-fir tussock moth, Orgyia pseudotsugata McD., outbreak southeast of Coeur d'Alene, Idaho, in 1974. Observations began June 27 when about 50 percent ...

  Citation × Citation Citation Abstract Copy Title: Natural mortality in a Douglas-fir tussock moth infestation in Idaho, 1974 Author: McGregor, Mark D., Lood, Rudolph C., Tunnock, Scott, United States. Forest Service. Northern Region. State & Private Forestry Mortality from various causes was recorded in a Douglas-fir tussock moth, Orgyia pseudotsugata McD., outbreak southeast of Coeur d'Alene, Idaho, in 1974. Observations began June 27 when about 50 percent of the larvae were second instars and continued until pupation. Within a 35-day period, there was a 93 percent average reduction in population. Approximately 36.7 percent of the population collected and reared in the laboratory died from unknown causes; 11 percent were parasitized; and 3.4 percent were killed by nucleopolyhedrosis virus. Phobocampe n.s. was the most abundant parasite and attacked all instars. Unlike most other past outbreaks, this one did not collapse at the end of 3 years due to virus and parasites. Egg masses were found in infested areas during the fall of 1974. Title: Natural mortality in a Douglas-fir tussock moth infestation in Idaho, 1974 Author: McGregor, Mark D., Lood, Rudolph C., Tunnock, Scott, United States. Forest Service. Northern Region. State & Private Forestry Mortality from various causes was recorded in a Douglas-fir tussock moth, Orgyia pseudotsugata McD., outbreak southeast of Coeur d'Alene, Idaho, in 1974. Observations began June 27 when about 50 percent of the larvae were second instars and continued until pupation. Within a 35-day period, there was a 93 percent average reduction in population. Approximately 36.7 percent of the population collected and reared in the laboratory died from unknown causes; 11 percent were parasitized; and 3.4 percent were killed by nucleopolyhedrosis virus. Phobocampe n.s. was the most abundant parasite and attacked all instars. Unlike most other past outbreaks, this one did not collapse at the end of 3 years due to virus and parasites. Egg masses were found in infested areas during the fall of 1974. Close

• 4. [Article] Status of bark beetle infestations in second-growth ponderosa pine stands, Bureau of Land Management lands Garnet Mountains, Montana

  Mountain pine beetle infestations have increased in second-growth ponderosa pine stands in the Garnet Mountains since 1971. The extremely dry 1973 season resulted in an increase of Ips engraver beetle ...

  Citation × Citation Citation Abstract Copy Title: Status of bark beetle infestations in second-growth ponderosa pine stands, Bureau of Land Management lands Garnet Mountains, Montana Author: United States. Forest Service. Northern Region. State & Private Forestry, Lood, Rudolph C., McGregor, Mark D. Mountain pine beetle infestations have increased in second-growth ponderosa pine stands in the Garnet Mountains since 1971. The extremely dry 1973 season resulted in an increase of Ips engraver beetle activity that was responsible for over half of the tree mortality in 1973. Commercial thinning is recommended to alleviate the problem. Title: Status of bark beetle infestations in second-growth ponderosa pine stands, Bureau of Land Management lands Garnet Mountains, Montana Author: United States. Forest Service. Northern Region. State & Private Forestry, Lood, Rudolph C., McGregor, Mark D. Mountain pine beetle infestations have increased in second-growth ponderosa pine stands in the Garnet Mountains since 1971. The extremely dry 1973 season resulted in an increase of Ips engraver beetle activity that was responsible for over half of the tree mortality in 1973. Commercial thinning is recommended to alleviate the problem. Close