Seasonal Transmission of X-Disease Agent from Cherry by Leafhopper Colladonus montanus. K. Gonot Suslow, Staff Research Associate, Department of Entomological Sciences, University of California, Berkeley 94720. A. H. Purcell, Assistant Entomologist, Department of Entomological Sciences, University of California, Berkeley 94720. Plant Dis. 66:28-30. Accepted for publication 15 April 1981. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-28.

The leafhopper Colladonus montanus acquired the agent of the Green Valley type of X-disease from cherry and transmitted it to celery and to healthy Mazzard cherry seedlings. Transmission rates to celery increased throughout the growing season from 0 in April to a high of 25% in August. Results suggest that cherry may be a source of inoculum for spread to cherry and other host plants. C. montanus did not transmit the agent of the peach yellow leaf roll type of X-disease from peach in field and greenhouse experiments.

Keyword(s): cherry buckskin, epidemiology, western X-disease.