Copper fungicides have long been relief upon by both organic and conventional tomato growers to control many of the diseases affecting these plants. Not only are copper fungicides safer to use than many other fungicides on the market, they are also effective, and can be used up to a day before harvest.
Copper fungicides work as a result of the absorption of the copper ions by invading bacterium, causing the bacteria to become denatured. While copper alone is very soluble in water and therefor would be toxic to tomato plants, the copper hydroxide (made by combining copper with lime) used in copper fungicides is not water soluble, preventing the fungicide from damaging any of the plant material.


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