Azalea Branch Spots

iawalkJanuary 2, 2010

HELP! My beautiful azaleas have developed circular light green splotches all up and down their branches. It is killing the plants slowly and spreading. Does anyone know what this is or how I can put an end to it? Thank you in advance for your help!

:)

Thank you for reporting this comment. Undo
rhodyman(SE PA, USDA Z6)

One possibility is Twig Blight, Seifertia azaleae. Azalea and rhododendron branches can be affected by this disease. The disease is characterized by a grey powdery fungal growth. A mass of gray spores may be produced on leaf and branches surface. Infected shoots bend over at the lesion and may remain crooked or die back. Purple varieties are more susceptible to this disease. True resistance is not available as this is an opportunistic pathogen. To help reduce disease incidence, growers adjust plant spacing to reduce humidity and increase air circulation.

Azaleas that are sheared like a hedge are more prone to this problem. When pruning azaleas, one should open up the plant so that air can flow inside the plant. Use of hedge pruners is not advised because of this problem it causes.

Since you mention that the spots are green, I suspect that it is not Twig Blight, but is lichens. Lichens are curious & highly successful composite organisms consisting of a fungus growing in symbiotic concert with an algae, so that lichens become the only fungal organism capable of photosynthesis thanks to this union. Photosynthesis, hence the green color. However, lichens do not kill anything. They are just along for the ride, so to speak. They just sit there and generate their own nutrients.

Some people do not like lichens. Others prize them. I compare lichens to Spanish moss (which is not a lichen but is a bromeliad) and think they enhance the garden.

    Bookmark   January 3, 2010 at 8:54AM
Sign Up to comment
More Discussions
Advice on my Purple Gem
I have 2 purple gem rhododendrons that I planted over...
jada223
rescuing older, non-blooming azaleas
When we moved into our (very overgrown) house last...
pollyfan
Can anyone identify?
Hi these are two azaleas that we have had here since...
hello459
How much sun can this Rhododendron tolerate
It is a Nova Zembla. It will be planted in my back...
420benz
Canon's Double - wilting! Help!
I planted 2 Canon's Double Azaleas about 6 weeks ago....
Carol.123
© 2015 Houzz Inc. Houzz® The new way to design your home™