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Etiology

A Graft-Transmissible Agent Associated with Bark- and Wood-Grooving Disease of Peach and Nectarine. D. A. Rosenberger, Graduate Research Assistant, Department of Botany and Plant Pathology Michigan State University, East Lansing 48824; A. L. Jones, Associate Professor, Department of Botany and Plant Pathology Michigan State University, East Lansing 48824. Phytopathology 66:729-730. Accepted for publication 15 December 1975. DOI: 10.1094/Phyto-66-729.

Longitudinal grooves along the trunks and branches of peach and nectarine trees were observed in two orchards in southwestern Michigan. Symptoms were not present on leaves, fruit, or roots of affected trees. Halford peach seedlings inoculated by using buds, wood chips, and root chips from infected nectarine trees developed the same bark- and wood-grooving symptoms two years after inoculation. Preliminary attempts to transmit the causal agent(s) to herbaceous hosts have failed.