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George T Ferrell

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Abies concolorTen-year risk-rating systems for California red fir and white firGeorge T. Ferrell

Ten-year risk-rating systems for California red fir and white fir

George T. Ferrell · U.S. Dept. of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station

12 sayfa · 1989

Measurement / Diseases and pests / Fir / Abies magnifica / Abies concolor

FirRisk-rating systems for mature red fir and white fir in northern CaliforniaGeorge T. Ferrell

Risk-rating systems for mature red fir and white fir in northern California

George T. Ferrell · U.S. Dept. of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station

29 sayfa · 1980

Fir

Abies concolorGrowth classification systems for red fir and white fir in northern CaliforniaGeorge T Ferrell

Growth classification systems for red fir and white fir in northern California

George T Ferrell · U.S. Dept. of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station

18 sayfa · 1983

Growth / Classification / Fir / Abies magnifica / Abies concolor

Wounds and injuriesGouty pitch midge damage to ponderosa pines planted on fertile and infertile soils in the western Sierra NevadaGeorge T Ferrell

Gouty pitch midge damage to ponderosa pines planted on fertile and infertile soils in the western Sierra Nevada

George T Ferrell · U.S. Dept. of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station

Sayfa sayısı yok · 1987

Ponderosa pine / Plants / Growth / Cecidomyia / Wounds and injuries

Semanotus litigiosusWeather and tree growth associated with white fir mortality caused by fir engraver and roundheaded fir borerGeorge T. Ferrell

Weather and tree growth associated with white fir mortality caused by fir engraver and roundheaded fir borer

George T. Ferrell · Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture

11 sayfa · 1975

Diseases and pests / Scolytus ventralis / Abies concolor / Semanotus litigiosus

Plant indicatorsUsing indicator plants to assess susceptibility of California red fir and white fir to the fir engraver beetleGeorge T Ferrell

Using indicator plants to assess susceptibility of California red fir and white fir to the fir engraver beetle

George T Ferrell · U.S. Dept. of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station

Sayfa sayısı yok · 1986

Abies magnifica / Scolytus ventralis / Abies concolor / Plant indicators

Scolytus ventrabisStand and tree characteristics influencing density of fir engraver beetle attack scars in white firGeorge T. Ferrell

Stand and tree characteristics influencing density of fir engraver beetle attack scars in white fir

George T. Ferrell · Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture

Sayfa sayısı yok · 1973

Diseases and pests / Fir / Abies concolor / Scolytus ventrabis

Scolytus ventralisWeather, logging, and tree growth associated with fir engraver attack scars in white firGeorge T. Ferrell

Weather, logging, and tree growth associated with fir engraver attack scars in white fir

George T. Ferrell · Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture

11 sayfa · 1973

Diseases and pests / Trees / Fir / Growth / Scolytus ventralis

Diseases and pestsDifferential susceptibility of white fir provenances to balsam twig aphidGeorge T. Ferrell

Differential susceptibility of white fir provenances to balsam twig aphid

George T. Ferrell · U.S. Dept. of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station

Sayfa sayısı yok · 1989

Aphididae as carriers of disease / Abies concolor / Diseases and pests

DefoliationGrowth of white firs defoliated by modoc budworm in northeastern CaliforniaGeorge T Ferrell

Growth of white firs defoliated by modoc budworm in northeastern California

George T Ferrell · U.S. Dept. of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station

Sayfa sayısı yok · 1980

Fir / Spruce budworm / Diseases and pests / Defoliation

DefoliationStem volume losses in grand firs topkilled by western spruce budworm in IdahoGeorge T Ferrell

Stem volume losses in grand firs topkilled by western spruce budworm in Idaho

George T Ferrell · U.S. Dept. of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station

10 sayfa · 1982

Fir / Diseases and pests / Western spruce budworm / Defoliation

Diseases and pestsFir engraverGeorge T. Ferrell

Fir engraver

George T. Ferrell · U.S. Dept. of Agriculture, Forest Service

Sayfa sayısı yok · 1986

Fir / Bark beetles / Diseases and pests

Black pine leaf scaleBlack pineleaf scaleGeorge T. Ferrell

Black pineleaf scale

George T. Ferrell · U.S. Dept. of Agriculture, Forest Service

Sayfa sayısı yok · 1986

Black pine leaf scale