CERTIFICATION PROGRAM FOR STONE FRUITS
John R. Wynne
In the spring of 1955 it was suggested to us by staff members of the California Department of Agriculture and the U. S. Department of Agriculture in Sacramento that some of the problems encountered in the successful propagation of deciduous nursery stock were due to virus-infected scions and/or rootstocks. We were very interested in their findings, and their proposal to conduct tests with them at our growing grounds. In the first year of cooperating with these men we were impressed by preliminary evidence that viruses were an important factor affecting good bud stands and in producing vigorous and uniform nursery stock.
In the early stages of developing the Certification and Registration Program, Department of Agriculture members visually inspected bud sources in selected grower orchards. Visual inspections culled out the bud-source trees most severely infected with ringspot or other viruses.
At the time, bud lots were mingled on a variety basis, and no effort was made to ascertain the
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