F. Laws, Dianne J. Walmsley‐Woodward, W. J. Whittington
Apr 1, 1982
Annals of Applied Biology
SUMMARY Tridemorph-treated and untreated barley plants wre grown either in separate growth rooms or together. They were inoculated either with a sensitive or a tolerant isolate, and the progress of mildew was recorded. Comparisons were made between the rates of progress of sensitive and tolerant isolates on separated and unseparated fungicide treatments. Results suggested that interactions took place between pathogen populations on adjacent treated and untreated plants. Barley cv. Golden Promise was sown in plots made up of two adjacent fungicide treatments. Triadimefon, triforine, tridemorph and ethirimol were paired with each other and with untreated crops in all combinations. The progress of mildew on each plot was recorded, and differences were found between similar fungicide treatments from different plot pairs. The likelihood of interactions between mildew populations exposed in the field to different fungicide treatments is discussed.