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Relation of Root Condition, Weather, and Insects to the Management of Jack Pine

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Beginning in 1937 widespread mortality and decadence occurred in stands of jack pine in northern Minnesota. Ecological studies of the crowns, roots, and rate of growth of thirty-seven trees indicated that lack of soil moisture was the basic cause of the difficulty, although defoliation by budworms and sawflies undoubtedly increased the damage. A very marked deficiency in rainfall during the preceding 20 years, with severe drought at various times and high temperatures during periods of no precipitation, resulted in great mortality of feeding roots and played a major role in decadence. Since jack pine does not recuperate after it has once begun to stagnate, the author recommends the removal of all trees that are obviously not "earning money" at the first opportunity, particularly in periods of moisture deficiency.

Document Type: Journal Article

Affiliations: Entomologist, Bureau of Entomology and Plant Quarantine, U. S. Department of Agriculture

Publication date: February 1, 1944

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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.

    2015 Impact Factor: 1.476
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