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Studies on a virus causing stem grooving and graft‐union abnormalities in Virginia Crab apple *
Author(s) -
SEQUEIRA O. AMARO
Publication year - 1967
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1967.tb05922.x
Subject(s) - biology , xylem , rootstock , virus , horticulture , botany , virology
SUMMARY A virus was transmitted from apple trees to Nicotiana glutinosa and Chenopodium spp. and back to a range of woody indicators in which it affected only Virginia Crab; symptoms were grooves in the xylem, and swelling and necrosis of the scion immediately above the union with the stock. The virus was distinct from that causing stem pitting in Virginia Crab, because although easily detectable in several apple varieties, it was not found in many trees infected with stem pitting virus. The stem grooving virus has flexous particles 600–700 m/μ long, a heat inactivation point of 67 °C, a dilution end‐point of 10 ‐3 in N. glutinosa sap and remains infective for at least 2 days at 20 °C.