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The association of split‐leaf blotch virus with nettlehead disease of hops
Author(s) -
LEGG J. T.,
ORMEROD P. J.
Publication year - 1964
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.1744-7348.1964.tb07253.x
Subject(s) - biology , virus , virus diseases , disease , viral disease , leaf curl , plant virus , botany , horticulture , agronomy , virology , medicine , pathology
SUMMARY The distribution of two virus diseases, split‐leaf blotch and nettlehead, in hop plantations suggested that infection with split‐leaf blotch virus (SLBV) predisposed plants to nettlehead. Also in three field trials, the incidence of nettlehead disease was higher in plants (var. Fuggle) infected with SLBV than in healthy plants. The symptoms shown by Fuggle plants infected with SLBV were unaffected by additional infection with hop line‐pattern virus (HLPV), but plants of the varieties College Cluster and Keyworth's Midseason infected with both viruses developed symptoms resembling nettlehead disease in some respects. Such affected plants did not, however, induce nettlehead in plants of the indicator variety Early Prolific to which they were grafted, and therefore nettlehead disease is not the result of dual infection with SLBV and HLPV. Despite the field association of split‐leaf blotch and nettlehead symptoms, experimental data indicate that SLBV is not a component of the virus complex causing nettlehead disease.