Phytotoxicity in mandarins caused by phosphorous acid
Growth rates of young mandarin (Citrus reticulata cv. Imperial) trees on C. sinensis rootstocks were reduced by foliar sprays or soil drenches with m-d KP Foli-R-Fos (20% a.i. phosphorous acid) at rates of 2 L/100 L water or higher. Foliar sprays caused leaf burn, particularly to new growth. Growth rates of trees treated with soil drenches of Ridomil 50G (5% a.i. metalaxyl) at 20 g/m2 were not significantly different from those of either check trees or trees sprayed with m-d KP at 2 L/100 L water.
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