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Dynamics of Symptom Development of the Seed-Borne Pea Fizzletop Virus. R. O. Hampton, Research Plant Pathologist, Plant Science Research Division, ARS, USDA, Oregon State University, Corvallis 97331; Phytopathology 62:268-272. Accepted for publication 13 September 1971. DOI: 10.1094/Phyto-62-268.

Pea fizzletop virus (PFV) isolates produced uniform symptom profiles on selected hosts, and exhibited uniform properties. Most seedlings from PFV-infected seed exhibited discernible degrees of downward leaf roll, vein protrusion, and/or veinbanding when 1 to 3 weeks old, and were visually detectable with high accuracy. Plants with such symptoms were usually stunted, and robust plants were free of pea fizzletop symptoms. Germination vigor was not affected by the presence of PFV within the seed. PF symptoms became transient in 6- to 8-week-old plants, and under field conditions most infected plants appeared normal at full bloom stage. Five to 10% of the symptomless, vigorous plants from infected “seedlots” (an experimental sample of seed supplied by a commercial source) were found to contain PFV. PFV in these symptomless plants was not detectable by assay until plants were 5 to 8 weeks old.