![]() pluvialis is carried in airborne water droplets. pluvialis is a native of North America where it affects Douglas-fir. Infected trees show symptoms between March and September, usually peaking from July onwards. It is caused by the algae-like organism Phytophthora pluvialis. Infected needles turn yellow then red and are cast or blown off the trees a few months after symptoms appear. Dave Clement, Principal Agent, University of Maryland Extension, Home & Garden Information Center.Red needle cast (RNC) is a disease that infects pine trees and Douglas-fir needles. Bald cypress ( Taxodium distichum) - deciduous evergreen, excellent for sites with wet soil.īy Dr.Eastern red-cedar, Juniperus virginiana ‘Grey Owl’ (with berries) or ‘Manhattan Blue’ (without berries).Himalayan cedar ( Cedrus deodara ‘Karl Fuchs’).Arizona cypress ( Cupressus arizonica ‘Blue Ice’).Be sure to research the growing requirements (e.g., winter hardiness, etc.) for these trees, to make sure they are appropriate for your location in Maryland. If you are looking for a nice evergreen tree for your landscape, consider any of the following alternatives to blue spruce. Severely diseased trees should be removed and replaced with better adapted conifers for the mid-Atlantic region. Therefore, fungicide sprays are impractical for most homeowner trees. Diseased branches can also serve as sources of infective spores for many years after infection and help intensify disease progression. ![]() Practical management of both of these diseases is difficult because the infection period can extend from spring through fall depending on rainfall. The infection period can extend from spring through fall depending on rainfall. Drought stressed trees are more vulnerable to this disease. The disease causes large amounts of resin flow that appear as white crusty sap streaks on the bark. Infection starts in the spring on wounds caused by pruning cuts, insects, hail damage, or cracks caused by ice, or snow load.
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