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Phomopsis blight of juniper is a foliar disease discovered in 1917 [1] caused by the fungal pathogen Phomopsis juniperovora.The fungus infects new growth of juniper trees or shrubs, i.e. the seedlings or young shoots of mature trees.
The common name of Keithia blight or Keithia leaf blight was derived from the first generic designation for the fungus and remained in use for many years. Pier Andrea Saccardo erected the genus Keithia in 1892 for this fungus, [1] and in 1903 the genus Didymascella for the same fungus was published as new, twice in the same month.
However, leaf spots may, in advanced stages, expand to kill entire areas of leaf tissue and thus exhibit blight symptoms. Blights are often named after their causative agent. For example, Colletotrichum blight is named after the fungus Colletotrichum capsici, and Phytophthora blight is named after the water mold Phytophthora parasitica. [11]
Gymnosporangium sabinae is a species of rust fungus in the subdivision Pucciniomycotina.Known as pear rust, European pear rust, or pear trellis rust, it is a heteroecious plant pathogen with Juniperus sabina (savin juniper) as the main primary host and Pyrus communis (common pear) as the main secondary host.
Gymnosporangium juniperi-virginianae is a plant pathogen that causes cedar-apple rust. [1] In virtually any location where apples or crabapples and eastern red cedar (Juniperus virginiana) coexist, cedar apple rust can be a destructive or disfiguring disease on both the apples and cedars.
Phomopsis obscurans is a common fungus found in strawberry plants, which causes the disease of leaf blight. Common symptoms caused by the pathogen begin as small circular reddish-purple spots and enlarge to form V-shaped lesions that follow the vasculature of the plant's leaves.
The disease cycle for cane blight begins when the fungus, Leptosphaeria coniothyrium, enters the vascular tissue of the canes through wounds. [ 4 ] [ 3 ] Wounds are commonly caused by pruning , but insect damage, freeze injury, or other various forms of mechanical injury can also be points of entry.
The fungus also causes a blight disease of the commercial tea plant, Camellia sinensis. [14] Symptoms of blight was observed in commercial tea estates in Darjeeling, India. [14] The disease affected plants of all ages, being especially pronounced in younger plants. Fungal colonies displayed an initial white colour that eventually turned gray/brown.