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Learn how to accurately prepare pesticide spray solutions for small areas using a backpack or hand-held sprayer. This step-by-step guide walks you through the University of New Hampshire’s worksheet designed for label rates given per acre—helping you scale down large-acreage rates into precise small-volume applications.

In this video, you’ll learn:
• How to calculate the total spray solution needed for a small plot
• Converting label rates (per acre) into amounts for smaller areas
• Measuring and mixing the correct product volume with water
• Tips for accurate record-keeping and equipment prep

Proper mixing ensures safe, effective, and efficient applications-saving you money, reducing waste, and protecting the environment.

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Using Backpack and Handheld Sprayers for Small Area Pesticide Applications
When applying pesticides to small areas, a backpack or handheld sprayer is often the most suitable tool. These sprayers typically hold between 1 to 5 gallons of spray solution, making them convenient and easy to maneuver in targeted spaces.
However, pesticide product labels are often designed for larger application areas and volumes than your job may require. To help with this, the University of New Hampshire has developed a series of worksheets that convert large-area application rates into equivalent rates for smaller areas.
Product labels vary in how they present mixing rates. You may see instructions based on:

Amount per gallon
Amount per acre
Amount per 1,000 square feet
Or other formats

To ensure accuracy, choose the worksheet that matches the label rate format of the product you’re using.
Regardless of the format, you can mix your spray solution using a simple three-step process:

Determine the total spray solution needed.
Calculate the amount of product to mix into that solution.
Combine the product with the appropriate amount of water to prepare the final spray solution.

As with any pesticide application, recordkeeping is essential. It’s good practice to document the equipment used, application rates, and amounts for future reference.

Example: Using the “Per Acre” Worksheet
In this video, we’ll use the worksheet designed for products with label rates listed as an amount per acre. This worksheet works for both liquid and dry products.
Let’s walk through the process using an example product with a label rate of 2 quarts per acre.
Step 1: Determine Total Spray Solution Needed
First, calibrate your sprayer based on the label instructions and the terrain you’ll be spraying. UNH provides videos and worksheets to help with calibration.
In our example, we’re spraying a lawn area. The label recommends applying the product in 20–40 gallons of spray solution per acre. After calibrating our equipment, we determine we’ll apply 30 gallons per acre.
Next, measure the area to be sprayed. Suppose the lawn is 50 feet by 100 feet, totaling 5,000 square feet.
To calculate the spray solution needed:

Multiply the delivery rate (30 gallons/acre) by the area (5,000 sq ft)
Divide by the number of square feet in an acre (43,560)

(30 × 5,000) ÷ 43,560 = 3.44 gallons of total spray solution needed
Step 2: Calculate Product Amount
The label rate is 2 quarts per acre. To find the amount needed for 5,000 sq ft:

Multiply 2 quarts by 5,000
Divide by 43,560

(2 × 5,000) ÷ 43,560 = 0.23 quarts of product
Be sure to record the units (quarts, ounces, tablespoons, etc.) on your worksheet.
Step 3: Mix the Spray Solution
Mix 0.23 quarts of product with enough water to make 3.44 gallons of spray solution.
Start by adding about half the water (1.72 gallons) to the tank. Then add the product. Since the amount is small, it may be easier to convert to fluid ounces:

1 quart = 32 fluid ounces
0.23 quarts × 32 = 7.36 fluid ounces

Add the product, agitate the tank to mix thoroughly, then add the remaining water to reach 3.44 gallons.

Final Tips
Effective pesticide application starts with accurate mixing based on label rates and using the correct worksheet. With proper calculations, you’ll prepare just the right amount of spray—no waste, no leftovers.
After spraying, clean and store your sprayer and mixing tools properly.
For more information on best practices for backpack and handheld sprayers, visit the University of New Hampshire Extension website to view our instructional video series.