How do I disinfect pruning tools properly?

Written by
Nguyen Minh
Reviewed by
Prof. Samuel Fitzgerald, Ph.D.The effective disinfection of tools is a fundamental practice to prevent the spread of disease throughout the orchard. I have seen bacterial canker spread from tree to tree as a result of dirty blades. Disinfecting the pruning tools after each use helps preserve the investment. Clean tools produce cleaner cuts that heal faster, and this simple routine saves trees.
Solution Preparation
- Alcohol solution: Mix 70% isopropyl alcohol with water
- Bleach mixture: Combine 1 part bleach to 9 parts water
- Alternative: Commercial disinfectant sprays for tools
- Caution: Never mix bleach with other chemicals
Cleaning Procedure
- Scrub first: Remove sap with stiff brush and soapy water
- Soak time: Submerge blades for 5 full minutes
- Contact: Ensure solution touches all cutting surfaces
- Frequency: Disinfect between every tree
Drying & Storage
- Air dry: Wipe then leave tools open for 10 minutes
- Prevent rust: Apply light oil coating after drying
- Storage: Use silica gel packs in toolbox
- Location: Keep in dry, temperature-stable area
Removing sap is crucial to disinfecting. I scrub my tools with a brass brush and soapy water. Stubborn residue needs mineral spirits. Clean metal lets disinfectants penetrate properly. Dried sap harbors pathogens that will make ineffective solutions against hidden microbes.
Dryness prevents rusting. I place tools on clean rags for ten minutes after disinfection. Moisture causes pitting, and pitting is the microcosm of bacterial growth. Keep tools oiled with light machine oil while in storage. Pruners can last for decades and perform splendidly if treated properly. Never put wet tools into closed containers.
Use separate tools for diseased trees. I use red-handled tools exclusively for the diseased materials. These tools should be disinfected twice: once before use and once after use. Soak in a bleach solution for ten minutes after cutting fire blight. They should be rinsed to avoid corrosion.
How frequently do you disinfect? I clean my tools between every tree when pruning trees, routinely. After pruning diseased trees, I disinfect my tools before moving on to the healthy ones. I carry a portable dip bucket around my orchard to prevent cross-contamination of varieties and species.
Read the full article: Fruit Tree Pruning Guide: When and How to Prune