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Disease gradients and small plot experiments on barley mildew
Author(s) -
JENKYN J. F.,
BAINBRIDGE A.
Publication year - 1974
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.1744-7348.1974.tb01367.x
Subject(s) - powdery mildew , biology , fungicide , agronomy , mildew , crop , hordeum vulgare , plot (graphics) , horticulture , poaceae , mathematics , statistics
SUMMARY In two experiments, on Julia and Zephyr spring barley, evidence was obtained that the development of powdery mildew in sprayed plots depended very much on their proximity to unsprayed crop. The effective period of control achieved with one spray was greater where plots were well separated from unsprayed crop than where they were surrounded by or very close to unsprayed crop. There is probably a risk that small plot experiments may not only underestimate the potential effectiveness of fungicides in agricultural practice, but also give misleading information on optimal spray timing.