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Effect of Invasion by Hypoxylon and Other Microorganisms on Carbohydrate Reserves of Oak-Wilted Trees

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Abstract:

Black oak trees inoculated in April with the oak wilt fungus, Ceratocystis fagacearum, were analyzed at monthly intervals for concentrations of total carbohydrates, reducing sugars, and starch. Concentrations of glucose, sucrose, and fructose began decreasing in both trunk sapwood and branches by the second month after inoculation and coincided with colonization of the sapwood by Hypoxylon spp., mostly H. atropunctatum. The reduction continued until the fifth month when starch reserves were essentially depleted, and concentrations of total carbohydrates and reducing sugars were less than 20 percent of those in healthy control tissues. Hypoxylon spp. apparently caused starvation of C. fagacearum by depleting its carbohydrate food base. Forest Sci. 20: 337-342.

Keywords: Ceratocystis fagacearum; Hypoxylon atropunctatum; biological control

Document Type: Journal Article

Affiliations: Research Assistant Department of Plant Pathology, University of Arkansas, Fayetteville, 72701

Publication date: December 1, 1974

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