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Decline and Mortality of Red and Scarlet Oaks

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Declining and dying Quercus rubra L. and Q. coccinia Muenchh. were found to be affected by leaf roller defoliation, root rot, Agrilus attack, late spring frost, drought, and unfavorable soils. Symptoms of decline were reproduced artificially by defoliation of sapling Q. rubra. Other factors, such as root rot, drought, and frost, are considered contributory but not primarily causal. It was concluded that the initial symptoms of decline reflect a diminished availability of carbohydrates for growth, and that final symptoms of subsequent mortality reflect extreme moisture stress. A similar decline of European oaks is pointed out.

Document Type: Journal Article

Affiliations: Plant Pathologist, Rocky Mountain Forest and Range Expt. Sta., Forest Service, U. S. Dept. Agric.

Publication date: March 1, 1965

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