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GRAFTING EXPERIMENTS WITH VARIETIES OF HOPS RESISTANT TO TICE HOP POWDERY MILDEW, SPHAEROTHECA HUMULI (DC.) BURR.
Author(s) -
SALMON Prof. E. S.,
WARE W. M.
Publication year - 1927
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.1744-7348.1927.tb07012.x
Subject(s) - biology , powdery mildew , hop (telecommunications) , sphaerotheca , rootstock , horticulture , botany , inoculation , computer network , computer science
Summary.1 Twenty composite plants were built up by grafting either a scion of an immune variety of hop on a susceptible stock, or vice versa . Inoculation of young leaves of the scion, after a considerabll growth of the latter had taken place since grafting, showed that no change had been effected in the varietal immunity or susceptibility in relation to Sphaerotheca Humuli.2 In the above experiments, scions of six different immune varieties were grafted on stocks of four different susceptible varieties and scions of four different susceptible varieties were grafted on stocks of five different immune varieties. 3 The results obtained render it improbable that immunity or susceptibility to S. Humuli is connected with any translocatable substance in the hop plant.