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Importance of Treatment Timing in the Control of Fusarium Root Rot of Douglas-fir Seedlings. W. J. Bloomberg, Forest Pathologist, Pacific Forest Research Centre, Department of the Environment, Victoria, B.C., Canada; W. Lock, Research Technician, Pacific Forest Research Centre, Department of the Environment, Victoria, B.C., Canada. Phytopathology 64:1153-1154. DOI: 10.1094/Phyto-64-1153.

Two soil drenches of captan aqueous suspension to Douglas-fir seedbeds, applied 20 and 40 days after sowing, significantly reduced the number of seedlings killed by root rot caused by Fusarium oxysporum, but application of the dry chemical at sowing only, or drenches at 10 and 20 days failed to reduce disease incidence. No increase in control was obtained by increasing the frequency of treatment to every 10 days for up to 40 days after sowing, or by doubling the dosage rate from 0.19 g to 0.38 g/m of row.