Step 1
The fungus of concern — Gymnosporangium juniperi - virginianae — successfully lives in many other common U.S. landscape painting plants in accession to between easterly red cedar ( Juniperus virginiana ) and apple trees . The spores of the fungus also thrive and infest other juniper shrubs and primer binding evergreen plant as well as crabapples . While no easterly redcedar trees may be within several hundred feet of an apple tree , other ubiquitous junipers can lead to the Malus pumila or crab apple tree diagram becoming infect . Malus pumila and crab apple trees do not infect each other — the fungus must endure back and off between them and a cedar or juniper bush plant life .
Step 2
Fungal Life Cycle
The spores of the fungus spread in the winding during the summer . The fungus tends to proliferate when the humidness is high and temperatures hover in the 50 to 75 F reach . On cedar trees and raetam , the spore educate into galls or ball - similar tumors that survive the winter . In spring , the galls grow and get on to about fourth part coin - sized and look light light-green brown and warty . Anytime it rain down , brown telia , hornlike reproductive fungal structures , elongate and turn orange on the galls to unfreeze spores into the wind . These spores country on apple trees and cause tiny wound . After two to three weeks , the center of the lesions on leaf undersides become jag with bright orange aecia consistence . An aecia is a cuplike fungal procreative structure . The aecia releases spore , called aeciaspores , into the fart that land on cedar tree trees and retem . The animation cycle perpetuates between the plants .
Planting Apples Near Cedars
The world-wide road map is to not plant apple trees in law of proximity of cedar Tree or retem in an effort to diminish any likeliness of narrow cedar - apple rust . Ideally , do not set apples within several hundred foot of cedar Tree , accord to the Plant Disease Diagnostic Clinic at Cornell University . But be aware , jazz still might deposit spore among plants located thousands of yard aside . orchard apple tree trees infected with cedar - apple rust fungus might not make acceptable fruits and could be debate useless to the gardener .
Potential Solution
Contact your local cooperative telephone extension post and ask about passport for planting apples in proximity to cedar trees or landscape painting retem . Depending on your climate and soil , sure apple tree diagram varieties show first-class resistance to the fungus . If you may not rid your property of cedar tree trees or junipers , engraft only resistant apple cultivars might prove the best choice . Pruning off crust or spraying antifungal becomes costly and tedious . The University of Missouri mentions a few apples that do n’t succumb to cedar - apple rust problems . Cultivars ' Liberty , ' ' Nova Easygro , ' ' Novamac , ' ' Priscilla , ' ' Redfree ' and ' William ’s Pride ' possess the high-pitched resistance . ' Enterprise , ' ' exemption , ' ' Pristine ' and ' Trent ' apple diverseness also extend considerable resistance to the effects of the fungus .
References
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