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Sap Transmission of Chlorotic Leaf Spot and Stem-Grooving Viruses to Apple. R. M. Gilmer, Professor, Department of Plant Pathology, New York State Agricultural Experiment Station, Cornell University, Geneva, New York 14456; J. K. Uyemoto, Assistant Professor, Department of Plant Pathology, New York State Agricultural Experiment Station, Cornell University, Geneva, New York 14456. Phytopathology 62:585-586. DOI: 10.1094/Phyto-62-585.

Six of nine apple stem-grooving virus isolates were transmitted mechanically from infectious Zucchini squash sap to 8-day-old McIntosh apple seedlings. An apple chlorotic leaf spot virus isolate was similarly transmitted from infectious Chenopodium sap. More transmissions were achieved in apple seedlings predarkened for 72 hr before inoculation than in those grown at a 16-hr photoperiod. Neither virus incited symptoms in infected apple seedlings, but each was recovered 22-82 days after inoculation.