Because dwarf and semidwarf types of fruit trees are smaller at maturity than the large standard types of fruit trees, a system known as tree-row volume has been developed to determine how much spray mix is needed to cover the smaller trees. Although tree-row volume might sound complicated to someone who has never used it, it is well worth the effort to learn about it, because it should result in more accurate coverage and likely in less pesticide use per acre compared to using the full rates of water and pesticide. Tree-row volume is used to determine both the dilute volume and the related concentrate rate of pesticide per acre.
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Keith L. Smith, Associate Vice President for Ag. Adm. and Director, OSU Extension.
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