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Fungicide sprays applied in a timely manner are highly effective against the rust diseases during the apple cycle. [12] Most protective fungicide sprays are applied four times at 7- to 10-day intervals, starting with pink bud on crabapples. These applications are to protect the apples from spores being released from the cedar host in mid-spring ...
In some large acreage crops, fungicides are applied by air. The process is expensive and fungicide application is best reserved for seasons when foliar diseases are severe. Research indicates, the higher the foliar disease severity, the greater the return from the use of fungicides. [25] Southern corn rust disease, can be confused with common rust.
As the fungus grows and invades more of the apple tissue, the area becomes engorged until the entire apple is rotted. [19] Around the start of the 20th century Bordeaux mixture was the primary technique for controlling the disease; in the 1940s growers shifted to synthetic chemical use.
The fungus does not cause serious damage to junipers, but apple and pear trees can suffer serious loss of fruit production due to the effects of the fungus. Although the genus has a worldwide distribution, its impact depends on availability of its two host plant species.
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
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.
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This is a list of fungicides. These are chemical compounds which have been registered as agricultural fungicides . The names on the list are the ISO common name for the active ingredient which is formulated into the branded product sold to end-users. [ 1 ]
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