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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.
Powdery mildew Podosphaera leucotricha: Rosellinia root rot = Dematophora root rot ... Apple scar skin = apple dapple, apple sabi-ka, apple bumpy fruit
An apple is a round, edible fruit produced by an apple tree (Malus spp., ... Mildew is characterized by light grey powdery patches appearing on the leaves, shoots and ...
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. Gall making species include Melaphis rhois and Pemphigus spp. Further minor damage can be caused by the honeydew that woolly aphids secrete, which is difficult to remove.
Jonagold is triploid, with sterile pollen, and as such, requires a second type of apple for pollen and is incapable of pollenizing other cultivars. [2] It is susceptible to the diseases apple scab, powdery mildew, and fire blight, as well as the physiological disorders bitter pit and sunburn. [2] [3]
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Polycyclic epidemics are caused by pathogens capable of several infection cycles a season. They are most often caused by airborne diseases such as powdery mildew. Bimodal polycyclic epidemics can also occur. For example, in brown rot of stone fruits the blossoms and the fruits are infected at different times. [citation needed]