金冠苹果慎喷硫酸亚铁和高锰酸钾我们于６月中旬对有缺铁症状的金冠盛果期树喷施０．４％的硫酸亚铁溶液，对无缺铁症状的金冠喷１００ｍｇ／ｋｇ的高锰酸钾溶液防治褐斑病。以上两处理的金冠树果实均未套袋，并且少数果实已发生锈斑。喷施后第二天，有果锈的果实，果锈处... Golden Delicious apple caution spraying ferrous sulfate and potassium permanganate We in mid-June on the symptoms of iron deficiency fruit of golden crown fruit trees spraying 0.4% ferrous sulfate solution, no iron deficiency symptoms Golden Delicious spray 100mg / kg Potassium permanganate solution to control brown spot disease. The above two treatments were not bagged crown fruit, and a few fruit rust spots have occurred. The second day after spraying, fruits rusty fruit rust rust Department ...