Publisher's Synopsis
Excerpt from Selection of Stocks in Citrus Propagation
Large, medium, and small nursery trees of Washington navel and Valencia oranges and Marsh grapefruit grown in comparative tests show that after years in the orchard the large trees remain large, the intermediate remain intermediate, and the small remain small. The evidence indicates that this condition is inherent in the trees and that in planting orchards only the large nursery trees should be used.
An examination of sweet and sour orange seedling stock, such as is used for budding, showed the presence of many widely different types. Some of these types were propagated and the trees at the end of years still show the same marked difference. Some are fully 5 times as large as others. Yet all such types are used as stocks.
Budding on seedling stocks of different types and unknown char acter of growth is believed to be largely responsible for the different. Sizes of budded trees developed in the nursery and also for many of the irregularities in size and fruitfulness of orchard trees.
Paper No. 63, University of California, Graduate School of Tropical Agri culture and Citrus Experiment Station, Riverside, California.
This discovery means that nursery methods should be changed.
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