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#1
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Brown Spot(s) on Rhodo.
Hi --
Seeking opinions on what to do, if anything, about brown spots and discoloration on Rhododendron leaves. I found info about brown spots with white in the middle but there is no white spots on these leaves. Well-establishes plants in Zone 6, NJ http://members.aol.com/twobtold/Garden/1Rhodo_leaf.jpg Thanks for any insight. |
#2
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Brown Spot(s) on Rhodo.
My best guess is a fugal leaf spot called Cercospora. Generally only an
aesthetic issue. Make sure to =remove fallen leaves to partly interrupt the transmission cycle. There fungicides that can be used, but these only effective if used as a preventative, and thus must be used every year, The disease is gen worst when humidity is high in the spring, and when temps. hover near 50 deg F during these humid times. Good luck -- Mike LaMana, MS Heartwood Consulting Services, LLC Toms River, NJ www.HeartwoodConsulting.net "Twobtold" wrote in message ... Hi -- Seeking opinions on what to do, if anything, about brown spots and discoloration on Rhododendron leaves. I found info about brown spots with white in the middle but there is no white spots on these leaves. Well-establishes plants in Zone 6, NJ http://members.aol.com/twobtold/Garden/1Rhodo_leaf.jpg Thanks for any insight. |
#3
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Brown Spot(s) on Rhodo.
From: "Mike LaMana" fake@MikeatHeartwoodConsultingdotne
My best guess is a fugal leaf spot called Cercospora. Generally only an aesthetic issue. Thanks for reply. Looks similiar if not the same. http://www.ppath.cas.psu.edu/EXTENSI...E/imgs/050.jpg |
#4
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Brown Spot(s) on Rhodo.
OK, I know that Rhodo also gets Septoria. Maybe a better candidate.
-- Mike LaMana, MS Heartwood Consulting Services, LLC Toms River, NJ www.HeartwoodConsulting.net "Twobtold" wrote in message ... From: "Mike LaMana" fake@MikeatHeartwoodConsultingdotne My best guess is a fugal leaf spot called Cercospora. Generally only an aesthetic issue. Thanks for reply. Looks similiar if not the same. http://www.ppath.cas.psu.edu/EXTENSI...E/imgs/050.jpg |
#6
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Brown Spot(s) on Rhodo.
In article ,
(Twobtold) wrote: Seeking opinions on what to do, if anything, about brown spots and discoloration on Rhododendron leaves. I found info about brown spots with white in the middle but there is no white spots on these leaves. Well-establishes plants in Zone 6, NJ 1) Wind and cold damage is indicated when the edges of the leaves become distorted and turn brown. This occurs frequently in plants that may be in a colder climate than recommended or in a location with severe exposure. Note, boron poisoning will create the same symptoms. 2) Large leaved rhododendron are susceptible to sunscald if the plants do not receive enough moisture before the soil freezes. The leaves curl in cold winter weather, exposing the central part of the leaf but not the edges, resulting in the area near the main vein becomes desiccated and turns brown. To prevent this, water plants thoroughly before the first hard frost, protect from drying winds, apply mulch, and locate in partial shade. 3) If a leaf has brown areas with white spots, it probably has a local fungal infection of Pestalotia leaf spot. This is seldom controlled with fungicides and is best mitigated by good sanitation and avoiding excessive moisture. -- Pardon my spam deterrent; send email to Visit my Rhododendron and Azalea web pages at: http://home.earthlink.net/~rhodyman/rhody.html Also visit the Rhododendron and Azalea Bookstore at: http://home.earthlink.net/~rhodyman/rhodybooks.html Cheers, Steve Henning in Reading, PA USA http://home.earthlink.net/~rhodyman |
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