Pesticide rates for fruit crops are listed in several different ways on labels for various pesticide products. These differences are sometimes confusing to novice fruit growers and even to experienced growers. In our Ohio tree fruit spray guide, insecticide and fungicide products are listed with rates given two ways one column lists the amount of pesticide product per 100 gallons of water, and one column lists the amount of pesticide product per acre. How to decide which of these two rates to use to determine appropriate amounts of pesticide and water to use for a specific orchard is explained in detail in this bulletin.
Most reference books on fruit spraying show just one way of determining pesticide rates. This can leave the reader wondering if other methods are incorrect or just less preferred. In this bulletin, several methods are presented that should include most of the variations in spray rate calculations that fruit growers normally hear about. Recommendations for using each method are presented along with the advantages and disadvantages of each method.
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Keith L. Smith, Associate Vice President for Ag. Adm. and Director, OSU Extension.
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