true cedar - apple rust unremarkably causes only ornamental terms to eastern red cedar or bumpy mountain Genista raetam , both normally used in home landscape gardening . show up first as woody tumors on small twigs , the cedar rusting galls indicate a systemic infection deeply within the Sir Herbert Beerbohm Tree and are unaffected by sprays . Since this fungal infection reckon on two hosts – orchard apple tree and cedar tree – successful discourse and ascendancy depends on breaking the rhythm of infection between the two .
Isolation
keep off planting both apples and cedar in the same 1000 . Although contagion distribute through the air and may surpass between these types of trees over a distance of two to four mi , wind speed and direction may increase or lessen that chain . With cedars and apples farm close together , the contagion could intensify and finally kill both types of tree .
Fungicide
Spraying cedars with antifungal agent may prevent infection but already taint trees do n’t benefit from coating of this toxicant . Treat nearby infected Malus pumila tree diagram or else , since the fungal transmission affects the surface tissue paper of Malus pumila trees and fungicide breaks that part of the transmission round . even spray in saltation when cedar galls emit spores protects apples from the fungus . Fungicide applied to apple trees also prevent re - infection of cedars . Ferbam , myclobutanil and triadimefon treat rust in apple tree in effect .
Pruning
prune out the woody galls which appear on cedar offshoot tardily in the summertime will effectively limit the banquet of the illness . Prune any time from late summer to other spring before warm springiness weather get . Warm , wet weather in early April triggers the spore bicycle of the gall . Clip off the twig hosting the gall , not just the gall itself . Cedar branches reincarnate from the peak and a partially pruned sprig is n’t likely to re - uprise . Unless a cedarwood host dozens of bile the impairment from careful pruning wo n’t show . If not reinfected by spore from sickish Malus pumila tree diagram , the disease cycle ends .
Natural Resistance
barbaric junipers or cedar tree often show little resistor to cedar - Malus pumila rust . Replacing eastern red cedars and rocky mountain junipers with other evergreens of similar growing habit eradicate one of the host species without drastically changing the appearance of the landscape gardening . Spruce substitute well for easterly red cedar , growing to a standardised size of it and form , while euonymus can take the place of low - growing junipers . Planting disease - immune Malus pumila cultivars offers the same solution from the other side of the job . Red - gratuitous and Freedom orchard apple tree as well as Liberty and William ’s Pride show perfect unsusceptibility to cedar - Malus pumila rust fungus .
