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These applications are to protect the apples from spores being released from the cedar host in mid-spring. If cedar apple rust disease is diagnosed on apple fruits and leaves it is far too late to spray. Although curative fungicides also exist for cedar apple rust, they must still be applied before trees begin to develop symptoms. [13]
Gymnosporangium is a genus of heteroecious plant-pathogenic fungi which alternately infect members of the family Cupressaceae, primarily species in the genus Juniperus (), and members of the family Rosaceae in the subfamily Amygdaloideae (apples, pears, quinces, shadbush, hawthorns, rowans and their relatives).
American hawthorne rust Gymnosporangium globosum: Cedar apple rust Gymnosporangium juniperi-virginianae: Japanese apple rust Gymnosporangium yamadae: Pacific Coast pear rust Gymnosporangium libocedri: Quince rust Gymnosporangium clavipes... Side rot Phialophora malorum: Silver leaf Chondrostereum purpureum: Sooty blotch complex Peltaster fructicola
Almond rust is a disease of almond trees that is characterized by angular yellow leaf spots on upper leaf surfaces and rusty brown masses of spores on lower leaf surfaces. [6] It was first discovered in the upper Sacramento Valley area of California but now has subsequently spread throughout both the Sacramento and San Joaquin valley orchards ...
Southern rust's distinguishing characteristic is that pustules form mostly on the upper leaf surface and spores are more orange in color. Southern rust spreads more quickly and has a higher economic impact when hot, humid weather conditions persist. Timely fungicide applications to control southern rust are more crucial than with common rust. [26]
The most direct method of control is to exterminate juniper hosts near pear trees, though spores can travel at least 6 km from one host to another. If there is a chance of infection, spraying pear trees with a fungicide in spring and summer (typically a systemic one that is certified as capable of dealing with rust) may help, although this is ...
Infected leaves may fall in the late summer but the mites do not have a serious effect on the host tree. During the winter the mites are dormant living in the buds or under loose bark. [ 2 ] [ 3 ] The apple leaf mite is monophagous on species of Malus , including apple ( Malus domestica ), Hall crab apple ( Malus halliana ), European crab apple ...
Botryosphaeria obtusa is a plant pathogen that causes frogeye leaf spot, black rot and cankers on many plant species. [1] On the leaf it is referred to as frogeye leaf spot; this phase typically affects tree and shrubs. In fruit such as the apple, cranberry and quince, it is referred to as black rot, and in twigs and trunks it causes cankers. [1]