How to Spray Tomatoes With Copper Sulfate | 農藥合法資訊網

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You can spray tomato plants that have fruit with copper fungicides, but always read the manufacturer’s label first. The Purdue University Extension writers recommend using an organic Bordeaux mixture, which has a proven track record and also works on tomato bacterial diseases. Copper sulfate is sold in crystals, and the experts recommend mixing it with lime and water in a 4-4-50 formulation, based on pounds and gallons. However, you can reduce the ratio for home use (½-cup copper sulfate, ½-cup lime and 6¼-gallons of water, for example).

Wait until the weather outside is cool and calm before spraying, and put on long sleeves and pants, eye goggles and a safety mask before getting to work. Pour the mixture into a spray bottle or hand sprayer. Spray the first time on new plants two to four weeks after planting. Be sure to spray the tops and bottoms of the leaves as well as the plants. Spray them every s...