Watch out for this disease on your newly purchased plants
Did you corrupt a rhododendron this class ? If so , register on !
Over the last few years , increase numbers of dead ash tree trees ( Fraxinusspp . , Zones 3–9 ) have become a vernacular sight in landscape and on wayside in the Mid - Atlantic part . Now imagine if we jump losing oak trees ( Quercusspp . , Zones 4–9 ) at that pace . as luck would have it , that ’s not an immediate prospect , but it ’s a possibility that we gardeners demand to be cognisant of . A cardinal part of preventing , or at least delaying , the bedcover of potentially devastating pest and disease problems is staying up - to - date about the issues that are endanger our area and the measures in place to keep them in check .
Quarantines — like those currently in position to slow up the spread of the spotted lanternfly — are one way of life to belittle the spreadhead of pests and pathogens , but they are only as effective as far as citizenry trace the associated rule and restrictions . A recent quarantine falling out has potentially uncover several region , include ours , to sudden oak death ( SOD ) , a disease stimulate by the pathogenPhytophthora ramorum . Often fateful on certain oaks , it can induce ramorum blight , a unremarkably nonlethal foliage and twig blight , on many other trees and shrubs as well as oak .
For many twelvemonth , quarantine measures have been in home to keep SOD from spreading outside field of the West Coast . This spring , however , a shipment of nursery stock infect withPhytophthora ramorumwas shipped to more than two dozen states , including Ohio , Pennsylvania , Virginia , and West Virginia .
Seeing any of these does n’t automatically mean that your plant life is infected withPhytophthora ramorum , because other egress can make similar symptoms . A lab test is necessary to reassert the presence of this pathogen . touch your county ’s cooperative propagation service or state department of agriculture to find out how to report a potentially affected works , send in a sample distribution for examination , and safely dispose of the plant if the disease is confirmed .
functionary are continuing to track the shipment and dispersal of affected baby’s room stock , and it ’s possible that novel information about potentially let out plant and retail source where they ended up may be released in the coming calendar month . Visit the news section of your state ’s department of husbandry to stay up - to - date with developments in your area — on this government issue as well as others affecting gardens and landscape painting in our region .
Nancy J. Ondra is the author of over fifteen Word of God , includingGrasses , The Perennial Care Manual , andThe Perennial Matchmaker .
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‘Starry Night’ rhododendron (Rhododendron‘Starry Night’, Zones 7–9).Photo: Nancy J. Ondra
Phytophthora ramorumhas damaged these rhododendron leaves.Photo: Joseph O’Brien, USDA Forest Service, Bugwood.org
USDA plant pathologists Paul Tooley and Nina Shishkoff examine these rhododendrons for symptoms of infection with the sudden oak death pathogen,Phytophthora ramorum.Photo: Peggy Greb
