Micronutrient Chlorosis Cornell University PDDC（康奈尔大学PDDC微量营养素萎黄病）.pdfVIP

Plant Disease Diagnostic Clinic   Plant Pathology and  Plant‐Microbe Biology Section  334 Plant Science Building  Ithaca, NY 14853‐5904  Micronutrient Chlorosis Introduction he micronutrients iron, manganese, and zinc are required by all plants for proper growth and function. In alkaline to only slightly acid soils (pH above 6.5) these micronutrients may not be readily available to plants. Some plants when lacking one or a combination of these essential micronutrients show symptoms of yellowing or chlorosis of leaves (Fig. 1). Pin oak, red oak, Norway maple, rhododendron, azalea, mountain laurel, and other maples and oaks and ericaceous plants often show symptoms of foliar chlorosis when growing on soils with a pH of 6.5 or above. Figure 1: A Rhododendron sp. showing foliar chlorosis. In acid soils chlorosis of sensitive plants can be yellow, curl, turn brown along the margins and induced by the careless disposal of waste materials. display angular brown spots between the veins. Lime, plaster, building stone, ashes, wood waste, caustic chemicals, detergents, and limestone Management Strategies driveways create conditions that can lead to chlorosis if they are buried or located near sensitive plants.