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Effects of Defoliation by the Pine Butterfly Upon Ponderosa Pine

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A severe outbreak of pine butterfly occurred in central Idaho in 1922. Ponderosa pine was defoliated more or less completely on thousands of acres. Here are reported the results of a study of what happened to defoliated mature ponderosa pine. After 13 years 26 percent of the trees had died. The growth of those that survived was affected adversely by the defoliation. The severity of the defoliation is believed to be the most important factor contributing to the ultimate death or survival of the defoliated trees.
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Document Type: Journal Article

Affiliations: Bureau of Entomology and Plant Quarantine

Publication date: 1940-12-01

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  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.

    2016 Impact Factor: 1.675 (Rank 20/64 in forestry)

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