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Powdery mildew, caused by the obligate biotrophic ascomycete Podosphaera leucotricha, is one of the major diseases of cultivated apple throughout the world.The primary host is apple, but other fruit like peaches and quince provide a host for Podosphaera leucotricha. [2]
Powdery mildew is a fungal disease that affects a wide range of plants. Powdery mildew diseases are caused by many different species of ascomycete fungi in the order Erysiphales . Powdery mildew is one of the easier plant diseases to identify, as the signs of the causal pathogen are quite distinctive.
On apple Scientific classification; Domain: ... Podosphaera clandestina var. clandestina is a plant pathogen that causes a powdery mildew in apricots and peaches ...
Powdery mildew Podosphaera leucotricha: Rosellinia root rot = Dematophora root rot ... Apple scar skin = apple dapple, apple sabi-ka, apple bumpy fruit
Powdery mildew is manifest on the plant by white powdery fungal growth on the surface of the leaf, usually both sides of the leaf show fungal growth. [1] The host tissue is frequently stunted, distorted, discolored, and scarred. [3]
Symptoms caused by their feeding on a plant include twisted and curled leaves, yellowed foliage, poor plant growth, low plant vigor, and branch dieback. [citation needed] The woolly apple aphid, Eriosoma lanigerum is a widespread pest of fruit trees, feeding principally on apple, but also, pears, hawthorn, ash, alders, elms and oaks.
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A wide range of pests and diseases can affect the plant. Three of the more common diseases or pests are mildew, aphids, and apple scab. Mildew is characterized by light grey powdery patches appearing on the leaves, shoots and flowers, normally in spring. The flowers turn a creamy yellow color and do not develop correctly.