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Heteroecious rust fungi require two unrelated hosts to complete their life cycle, with the primary host being infected by aeciospores and the alternate host being infected by basidiospores. This can be contrasted with an autoecious fungus, such as Puccinia porri, which can complete all parts of its life cycle on a single host species. [9]
Stripe rust is a recent fungus to arrive in North and South America. The disease was first observed in Colombia in 1975 and is believed to have been brought over from Europe. [ 45 ] In the U.S. it was first discovered in Texas in 1991 and by the mid-90s it could be found throughout barley crops in the western states.
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.
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.
Cyproconazole is an agricultural fungicide of the class of azoles, used on cereal crops, coffee, sugar beet, fruit trees and grapes, and peanuts, [2] on sod farms and golf course turf and on wood as a preservative. [3] It has been used against powdery mildew, rust on cereals and apple scab, and applied by air or on the ground or by chemigation.
Thus, remedial control measures—using fungicides as protective sprays—are the main effective disease control method. [15] [18] [19] Soybean rust must be managed as early in the growing season as possible to be managed successfully. [20] Synthetic fungicides are the primary disease control option for protection against Asian soybean rust.
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