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Spores produced from the fungus-induced swellings on juniper stems can be infectious up to 6 km. The disease causes a yellow-orange spot that turns bright red on leaves of pear trees. The disease can be particularly damaging on pear, resulting in complete defoliation and crop loss if not treated.
Rust, Kern's pear Gymnosporangium kernianum. Rust, Pacific Coast pear Gymnosporangium libocedri. Rust, pear trellis (European pear rust) Gymnosporangium fuscum. Rust, Rocky Mountain pear Gymnosporangium nelsonii. Side rot Phialophora malorum. Silver leaf Chondrostereum purpureum. Sooty blotch Gloeodes pomigena. Thread blight (Hypochnus leaf blight)
Gymnosporangium libocedri, the Pacific Coast pear rust, is a plant pathogen and rust fungus. [1] It produces orange gelatinous growths ( telia ) on incense cedar in the spring. Its secondary hosts include apple , crabapple , hawthorn , mountain ash , pear , quince , and serviceberry .
“Poplars drop their leaves early in the fall and may skip changing colors due to lack of rain or leaf miner infestation. Same for several types of Hickory,” the certified arborist said.
The most common cause of bacterial leaf spots are by bacteria in the genera Pseudomonas and Xanthomonas. For example, Pseudomonas syringae pv. tabaci is known to cause angular leaf spots of cucumber, Pseudomonas syringae pv. phaseolicola to cause bean leaf spot and Xanthomonas campestris pv. phaseoli, angular leaf spot of cotton. [7]
Orange or yellow paints are used for harvest boundaries, and trees within those areas have blue, orange, green, or yellow paint, depending on whether they are to be taken or spared.
Gymnosporangium globosum is a heteroecious rust fungus that requires two hosts to complete its life cycle. Its telial stage occurs on eastern red cedar, Rocky Mountain juniper, southern red cedar, and other common junipers while its aecial stage will be found on apple, crabapple, hawthorne, and occasionally on pear, quince, and serviceberry.
Drops of orange liquid may be visible on the spots. Later in the season, black dots appear on the orange spots on the upper leaf surface. In late summer, tube-like structures develop on the undersurface of the apple leaf. Infected leaves sometimes drop prematurely, particularly during drought conditions or when the tree is under additional stress.