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 病狀:缺鈣時(shí),葡萄葉色變淡、幼葉脈間及葉緣退綠,隨后在近葉緣處有針頭大小褐色斑點(diǎn),后葉緣焦枯,葉片向下卷曲,新梢頂端生長點(diǎn)枯死;花朵萎縮,果實(shí)糖分積累少,味淡,果粉少,不耐貯藏;新根短粗、彎曲,根尖易變褐枯死。發(fā)病規(guī)律 (本文共 477 字 ) [閱讀本文] >>