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ON FORMS OF THE HOP RESISTANT TO MILDEW ( SPHAEROTHECA HUMULI (DC.) BURR.)
Author(s) -
SALMON. Prof. E. S.
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.tb07011.x
Subject(s) - biology , powdery mildew , hop (telecommunications) , sphaerotheca , conidium , resistance (ecology) , greenhouse , botany , horticulture , agronomy , computer network , computer science
Summary.1 Three varieties of hops which had previously shown complete resistance to the attacks of S. Human , became slightly infected in the greenhouse in the spring of 1926. 2 The susceptibility shown was only temporary; all the infected plants during May and June again acquired their power of complete resistance. 3 The conidia produced on an “immune” plant proved unable to infect that plant, although able to infect a susceptible variety. 4 It appears probable that abnormal weather conditions (possibly low temperature) brought about the temporary susceptibility.