Fungus on azalea trunk

Rivian

Shohin
Messages
421
Reaction score
336
Location
Germany
USDA Zone
6
?Hino Crimson? azalea with wavy leaves, thinking the fungus visible on the trunk is causing general sickness
ID of the culprit? Other azaleas are fine
azleatrunkd.jpg
azlleavs.jpg
 
Messages
1,545
Reaction score
2,899
Location
Bothell, WA
USDA Zone
8b
Looks pretty healthy from your photos.

Try this:1 tsp of 3% Hydrogen Peroxide in 3/4 of a liter of water spray bottle. Spray leaves both sides, trunk and soil. Repeat in a week, then in two, then of all is well 1x months

Cheers
DSD sends
 

0soyoung

Imperial Masterpiece
Messages
7,057
Reaction score
11,721
Location
Anacortes, WA (AHS heat zone 1)
USDA Zone
8b
Possibly whiteflies - a flick the branches will momentarily unleash a small cloud of them flying. If so, NEEM or whatever kind of hort oil you prefer.
 

penumbra

Imperial Masterpiece
Messages
5,037
Reaction score
7,693
Location
Front Royal, VA
USDA Zone
6
I am not seeing a problem. I do see a tiny bit of what looks like a lichen on the lower trunk. Plant looks healthy.
 

hemmy

Chumono
Messages
889
Reaction score
1,133
Location
Ventura Co., CA
USDA Zone
10a
When I see liverwort (bottom of your image) in my pots it seems like an indication of overwatering. But I also realize that you may want to keep azaleas wetter depending on your water quality to prevent mineral precipitation.
 

shinmai

Chumono
Messages
690
Reaction score
1,495
Location
Milwaukee WI
USDA Zone
5b
Do you use a systemic insecticide? The reason I ask is that I lost a very nice hinomaru to what turned out to be an infestation of root mealy bugs. When I received the tree it had an abnormal leaf curl, which at first I thought was due to temperature shock in shipping.
If the leaf curl gets worse, you might want to cut the wires and lift it out to inspect the root mass. If you see little white masses, you might want to immerse the root mass in a weak per solution.
 

penumbra

Imperial Masterpiece
Messages
5,037
Reaction score
7,693
Location
Front Royal, VA
USDA Zone
6
If you see little white masses, you might want to immerse the root mass in a weak per solution.
Bonide systemic granules work well for this. Cheap and easy from Amazon.
 

shinmai

Chumono
Messages
690
Reaction score
1,495
Location
Milwaukee WI
USDA Zone
5b
That should have read “peroxide solution”. I do use Bonide on a prophylactic basis, but it takes time to wash into the roots. I was thinking of peroxide as a way to immediately douse an infestation. I also just recently started using Cleary’s systemic fungicide, mostly for the benefit of my crabapple and my Japanese flowering apricot [which in this part of the country is notorious for picking up pretty much every fungus or blight known to man]. I figured it can’t hurt the other trees, so it’s also now part of my treatment regimen.
 
Messages
1,545
Reaction score
2,899
Location
Bothell, WA
USDA Zone
8b
One finds themselves glissading down a slippery slope when applying commercial fungicides on azaleas… especially when one is not sure there is actually an issue.

If one is sure harmful fungus is present and actually causing an issue, tread softly with the chemicals.

Azaleas rely on an active, robust rhizosphere. Killing off all the soil critters as a ‘prevention’ may end up halting the azaleas growth or killing off the azalea itself.

Diluted 3% hydrogen peroxide solution as described above is both a good occasional preventive and front line treatment.

Cheers
DSD sends
 

Forestcat

Seedling
Messages
17
Reaction score
2
Could be mealy bugs or scale. I treat for those with insecticidal soap, as well as mechanical removal of the scale.
 
Messages
1,545
Reaction score
2,899
Location
Bothell, WA
USDA Zone
8b
I am reasonably certain that this is the first and only time that the word ‘glissading’ has appeared on his forum. 🥃
That’s what happens when a Deep Sea Diver soars down the Cascades snowpack!
Cheers
DSD sends
 

Similar threads

Top Bottom