Citrus Wound Treatment: Copper Sulfate Risks and Proper Bordeaux Mix

Problem

Bob's 8-year-old orange: large limb wound coated with copper sulfate by local person. Now tree dying, small fruit. Last year beautiful.

Kathy's Philosophy

"I do not cover the wounds of my trees." Natural compartmentalization preferred.

Copper Sulfate/Bordeaux Analysis

Provides traditional Bordeaux mixture recipe:

• Copper sulfate dissolved in water (non-metal vessel)
• Lime slaked separately, strained
• Copper solution poured INTO lime (critical order)
• Add molasses (adhesion), Paris green (insecticide)
• 50-gallon batch, specific timing: bud swell, petal fall, 2 weeks later

Potential Issues

• Improper mixing → phytotoxicity
• Copper accumulation in soil
• Wound sealing may trap pathogens
• Modern arboriculture: leave wounds open to air

Recommendation

Stop wound treatments. Focus on tree vitality: proper watering, nutrition, deadwood removal. If disease suspected, consult certified arborist for targeted treatment.