Abstract
Copper hydroxide [Cu(OH)2] (Kocide 101®) used as a fungicide initially increased leaf copper (Cu) in ‘Hinodegiri’ and ‘Massasoit’ azaleas (Kurume type). There was a direct relationship between Cu(OH)2 rates and leaf Cu of ‘Massasoit’ up to 4 times the commercial rate of 3.58 grams ai/liter (3.08 lb/100 gal). Leaf Cu of ‘Hinodegiri’ was initially directly related to Cu(OH)2. At rates greater than 0.47 grams ai/liter (0.77 lb/100 gal), leaf Cu became inversely related to the rate of Cu(OH)2. No visual phytotoxic symptoms were observed at 4 times the commercial rate. Erroneous interpretation of leaf analysis could occur if the interpreter was not aware of recent Cu(OH)2 fungicide applications. Growers should not eliminate Cu fertilization based on Cu(OH)2 sprayed plants.
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