Data on crop growth suggest that only 8 days in spring are available for timely spraying of dinoseb-in-oil for control of cane vigour in raspberry in east-central Scotland. Crop records were linked with meteorological data to indicate the dates between which this 8-day period might fall. The meteorological data were then examined to assess the probability and likely duration of conditions suitable for spraying. High wind speed may severely restrict spraying by conventional equipment, but the risk from rain after spraying was found to be low.