Method 1: Use per-acre rate on the label.
The easiest decision about how much pesticide to use per acre is when a pesticide label states the rate only as an amount of product per acre, to be used regardless of whether the spray volume is high or low. For these products, we list their rates in our Ohio tree fruit spray guide only as an amount per acre, with no listing in the column for amount per 100 gallons.
For example, Savey 50WP on apples is used at 3 ounces per acre, whether in 25 gallons per acre or in 400 gallons per acre. For another example, Pounce 25WP on apples is used at 6 to 12 ounces per acre whether in 25 gallons per acre or in 400 gallons per acre.
When the label states a range of rates of pesticide per acre, such as Pounce used at 6 to 12 ounces per acre, then grower experience with factors such as pest density and tree size can be considered in deciding whether the low end of the rate range can be used or if it is necessary to go to the high end, or an intermediate rate.
Advantage of Method 1: It is easy, because no calculations are needed.
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| Figure 4. Airblast sprayer. |
Disadvantage of Method 1: The rate per acre is not given on the label of many pesticide products used on fruit crops, so this method is often not possible.
Recommendation: Use this method whenever possible. Note: This method is recommended only in cases where the rate on the label is stated only as a rate per acre. On many labels, the rate is given two ways as the rate per 100 gallons and as a full (maximum) rate per acre based on the standard conversion (as explained in Method 2).
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