Orchard Spray Rates
How to Determine the Amount of
Pesticide and Water to Use in Your Orchard

Bulletin 892-01

Author

Celeste Welty,
Extension Entomologist,
The Ohio State University

Contents

Background

Types of Orchard Pesticide Applications

Orchards Then and Now

Dilute Applications

Low-Volume or Concentrate Applications

Tree-Row Volume

Calculations for Dilute Applications

How much water is needed for a dilute application?

Method 1: Experience.

Method 2: Tree-row volume chart.

Method 3: Tree-row volume equations.

How much pesticide is needed for a dilute application?

Calculations for Concentrate Applications

How much water is needed for a concentrate application?

How much pesticide is needed for a concentrate application?

Method 1: Use per-acre rate on the label.

Method 2: Use full rate by the standard conversion.

Method 3: Use full rate less 20%.

Method 4: Use customized rate by tree-row volume.

Method 5: Use customized rate and percentage of standard.

Examples for Review

Spraying in Different Seasons and in Different Orchards

Summary

Acknowledgments

Appendix 1: Tree-Row Volume Chart

Appendix 2: Summary of How Much Water and Pesticide to Use

Appendix 3: Glossary of Terms

All educational programs conducted by Ohio State University Extension are available to clientele on a nondiscriminatory basis without regard to race, color, creed, religion, sexual orientation, national origin, gender, age, disability or Vietnam-era veteran status.

Keith L. Smith, Associate Vice President for Ag. Adm. and Director, OSU Extension.

TDD No. 800-589-8292 (Ohio only) or 614-292-1868