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Determination of Sample Size for Evaluating Resistance to Downy Mildew in Hops 1
Author(s) -
Hunt O. J.
Publication year - 1953
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1953.00021962004500090004x
Subject(s) - downy mildew , citation , library science , resistance (ecology) , mathematics , agricultural science , computer science , horticulture , agronomy , environmental science , biology
AN IMPORTANT objective in the breeding of hops in the United States is that of obtaining a reliable estimate of resistance for individual plants to downy mildew, Pseudoperonospora humuli (Miy. and Saka) Wils. It appears impossible to depend upon natural field infection for the evaluation of resistance to downy mildew of hybrid seedlings and new lines in a breeding program on hops. Therefore, it is necessary to subject either seedlings or excised plant parts to a controlled environmental condition following artificial inoculation to this disease. The effectiveness of the evaluation of resistance will be dependent upon the size and number of samples used in each determination. The purpose of this investigation was to obtain information relative to the most efficient method of sampling plants or plant parts for determining resistance to artificial inoculations of downy mildew.