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Copper Barrier for Snail Control on Fruit Trees

Owner asks if mixing copper sulfate with trunk paint repels snails.

Effective Barriers

Copper flashing/screen: 6" tall, buried few inches. Reacts with slime → electrical deterrent.
Bordeaux mixture (copper sulfate + hydrated lime) or copper sulfate alone brushed on trunks—repels snails ~1 year.
Add white latex paint or spreader for 2-season persistence.

Less Effective

Ashes or diatomaceous earth bands lose effect when damp.

Copper trunk paint is a valid, lasting snail deterrent.

Trees: Citrus Wound Treatment: Copper Sulfate Risks and Proper Bordeaux Mix; Comprehensive Slug and Snail Management for Lawns and Landscapes; Effective Slug and Snail Control for Vegetable Gardens; Why Painting Tree Trunks Is Harmful and Should Be Avoided; Controlling Snails in Nepenthes: Transplant and Bait Strategies; Copper's Effect on Water Lilies: What We Know; Effective Strategies for Controlling Slugs and Snails in the Garden; Natural-Looking Paint Protects Citrus Trunks from Sunburn; Copper Barriers for Slugs: Mixed Results and Penny Myths; Using Copper Screen to Repel Slugs and Snails from Pots and Beds

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