Davey Tree Flipbooks

78 The guidance in this section is intended for a licensed applicator. The entire APPLICATOR GUIDANCE section should be reviewed before mixing herbicides. Use the above worksheet to help determine the percent of herbicide to use in a spray solution. • Identify target vegetation as grass, broadleaf, or woody. • Determine if the goal is to achieve total vegetation control (bare ground) or selective control to preserve some existing vegetation. • Review COMMON RIVM HERBICIDES page and herbicide labels to determine which herbicide is appropriate for target vegetation and goal; select herbicide. • Measure the target area's length and width. • Check herbicide label for per acre rates. Never exceed the maximum allowable rate per acre per year. • If herbicide label rate is provided in ounces or gallons per acre, use the Herbicide Per Acre Rate Worksheet. If herbicide label rate is provided in percent per acre, use the Herbicide Percent Solution Worksheet. • Read the herbicide label to determine if tank mix partner herbicide or adjuvants are needed. Also, check the label to determine in what order water and herbicide or adjuvant should be mixed. • See the VOLUME CONVERSIONS AND MIX RATES page to maintain common volume units throughout worksheet. • When using herbicide in liquid or solid form use the proper measuring containers and follow the product label instructions. • The application rate in gallons per acre (GPA) of the herbicide solution can be found on the herbicide product label. Set the spray truck control panel to the appropriate (GPA) setting prior to each spray job. • Check the nozzle manufacturer's specifications calibration table to determine flow rate in gallons per minute (GPM) based on nozzle spray width, pounds per square inch (PSI), GPA, and ground speed. • Always refer to product labels and safety data sheets (SDS) to determine proper personal protective equipment (PPE). • Check the local weather forecast to determine if rain and wind conditions are suitable for application prior to mixing herbicide solution. CALCULATE ACRES TO BE TREATED: 1. (feet) area width × (feet) area length = (A) (square feet) spray area 2. (A) (square feet) spray area ÷ 43,560 (square feet per acre) = (B) acres to be treated CALCULATE HERBICIDE SOLUTION TO BE USED: 3. If using a spray truck reset control panel to the appropriate (GPA) application rate for broadcast applications (C) (GPA) application rate 4. (C) (GPA) application rate × (B) acres to be treated = (D) (gallons) mixed herbicide solution to be used CALCULATE HERBICIDE VOLUME TO BE USED: 5. READ THE LABEL to determine appropriate herbicide rate by percent solution: (E) (%) herbicide rate 6. (D) (gallons) mixed herbicide solution needed × (E) (%) herbicide rate = (F) (gallons) herbicide needed 7. If herbicide recommends using adjuvants, check adjuvant label for rate [ ounces of adjuvant per 100 gallons of herbicide solution x (D) (gallons) mixed herbicide solution needed = ÷ 100 = (G) ounces of adjuvant to use] CALCULATE GALLONS OF WATER NEEDED: 8. If needed convert adjuvant volume from ounces to gallons [ (G) (ounces) adjuvant volume ÷ 128 = (H) gallons adjuvant volume to be used 9. Add (F) (gallons) herbicide needed + (H) (gallons) adjuvant volume to be used = (I) gallons of additives 10. Subtract (I) (gallons) additives from (D) (gallons) mixed herbicide solution to be used = gallons of water to be used HERBICIDE PERCENT SOLUTION WORKSHEET (For labeled herbicide rates provided in percent)

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