Azalea Pests and Diseases

I have been wanting to get back to talking about pests and diseases for quite awhile – since the first couple of articles last year. Mostly because I was only able to hit on a few highlights the first go around. We introduced some of the broad issues and a short list of the chemical solutions to fight them. But going forward, I would like to addresses pests and diseases more specifically and hopefully give you the tools to both identify and treat them on your trees. As my own challenges with these problems occur, I have been trying to keep a photographic record so that I could share them as the need arises. While documenting such an outbreak of leaf gall on my azaleas, it occurred to me that I had a nice little package on azaleas, with some good treatment strategies, so here goes. Be forewarned, I only have one azalea bonsai in my collection – a Kozan variety Satsuki which is blooming right now. But I just counted and I have 38 azaleas, plus about a dozen rhododendrons in the landscape around our house. Most are very old and mature, and nearly all are summer blooming, putting them in a class with the Satsuki breed that we usually see as bonsai. It has provided a great learning ground, and may also help you with your landscape plants as well as your bonsai. 

Azalea Leaf Gall
This is a very unsightly disease and the cause of my latest round of spraying. I first saw this disease on a bonsai many years ago. It causes the leaves to thicken like a jade leaf and then distort into grotesque forms. It first starts out a light lime green. They usually occur randomly across a plant. The easiest solution is to just prune them out and that may be all that is actually needed to control it. The galls won’t kill the plant, but they will weaken the branch. But they just plain look bad. If you don’t get them pruned, they will turn white and fuzzy as they start to fruit and give off spores. You can see both stages in the photos, but don’t let them get that far. I discovered a relative epidemic once I started trimming the bushes around the house and found them thriving just under the new green leaves. They start to appear at, or just after flowering. Once they are removed, you can spray with the fungicides propiconazole (Bannermax, Fertilome Liquid Systemic) or chlorothalonil (Daconil) to prevent future outbreaks. I am just trying this spray treatment now, so I cannot verify the effectiveness yet.  

Azalea Leaf Gall

Lacebug
Grrrhhhh. I hate these guys. My wife was at Portland Nursery last week and they had a sign up that basically said, give up on azaleas and don’t plant them, all because of these guys. They are really becoming a nuisance the last few years in Portland. The nursery also said there are some resistant varieties out there. But as I said, I have about fifty mature plants to protect and they are my favorite landscape plants, pretty much ever, short of a Japanese maple. So they are here to stay and I am digging in. I am including photos of these buggers in three different stages. You can find better photos on the internet if you like. I am sharing these just to let you know the threat is real and can be dealt with, and that you may have to recognize them in different forms. The first signs are the stippled leaves. This may remind you of spider mites, but if you turn the leaf over, you may see adult or juvenile lace bugs running around. And they do have legs! I put this one guy on my barbecue and it was hard to keep up with him. Note also the black dots of fecal excrement. The lack of webs also tells you that it is not spider mites. I have also included a photo of spent lacebug carcasses to further indentify their presence. 

The short solution is to use a product with Imidacloprid in it and they go away. This is a systemic treatment and affects most bugs that want to suck on leaves. The problem being that if not used properly, it may affect good insects like bees. I really don’t want to enter into that discussion and don’t have strong enough information to properly guide you. I am just making you aware of what you are dealing with, both from a diagnostic and treatment point of view. There are also other direct contact sprays that you can use. The challenge will be getting the spray to them. I suggest a tank sprayer that you can get a high pressure on and stick the nozzle up under the branches so that you get all the undersides of the leaves. These guys should be fairly easy to kill, similar to aphids.   

Juvenile Lacebugs

Lacebug

Lacebug carcasses

lacebug_damage.jpg

Lacebug damage

Azalea Bark Scales
You may have never heard of these critters, and I hope that you never do. But, I have had todeal with them at both my old and new house, on azaleas and also Andromeda. These guys look like wooly aphids, or a wooly scale. They like to hang out in the crotches of branches or in the grooves of bark where they get more protection. Most sucking insects feed on the sap in the leaves, which is traveling up from the roots, through the xylem and out to the leaves. These bark scales suck on the sap that is flowing down through the phloem. That means that they are resistant to most systemic treatments like imidacloprid, which only works on the sap flowing up. Very few systemics are able to work both directions, but there are some that do, and of course are expensive and elusive. What is so insidious about these guys is that they hide out under the canopy, out of sight, where they go unobserved until permanent damage occurs. They tend to colonize on single branches of a plant, sucking it dry until you see it start to slowly fade and then eventually die. Pruning back the leaves reveals many tiny cottony tufts along the stems of the plant. But take heart, there is an effective solution. It’s work, but it can be done. Immediately prune out the infected branch. Pretty much it’s toast down to the roots. That means that you will have to grow a new branch to fill in, but in the landscape this is not a problem, just a patience issue. On bonsai, if you are paying attention, it should never get this far. But once you have pruned out the dead branches, it opens the tree up to spraying. Since the purpose of the cottony white shell is to protect the bug once it is stationary, the only time you can effectively treat them is in the spring – April-May, while they are out crawling around to a new home and have not yet developed their shell. I leave it to you to select your favorite poison. Some have suggested using a spray oil to suffocate the bugs in other seasons, but I have not tried this. I have had full recovery of plants using this method though, and am in the process of treating a few plants at our new home. 

That’s it for azaleas. Scott Elser

Abstract vs. Realism

If your eyes have managed to scroll down the page before you read this, you are probably wondering what these images of Mount Rainier have to do with anything related to bonsai. They are actually what I do most everyday to support my bonsai habit. That is, creating tee shirt designs for companies like Eddie Bauer, Columbia Sportswear, and Icebreaker. Eddie Bauer is an active outdoor lifestyle clothing brand with headquarters near Seattle and is nearing 100 years old. Mountains and trees figure in heavy with their Northwest heritage and the lifestylethey represent. And since you can see Mount Rainier right out the window of their home in Bellevue, they quite naturally want to feature that majestic giant in just about any design where there’s a mountain. There might be a whole collection with Denali, or Everest, K2, or the Tetons, but there is always Rainier. So every season, I have to figure out a new way to represent the mountain, whether it is the feature or in the background. 

By stepping out of bonsai and using tee shirt designs as examples, I am hoping that we can take a close look at the concepts of what we are dealing with and what we are trying to accomplish in our bonsai. What you can see by these examples, all from the same person, is that there are many ways to represent the same physical object and it can be associated with many different ideas. Maybe it’s very literal, as in a photograph, or abstract – to the point where you might barely recognize the source. 

What we have in bonsai is making some of the same choices in the way that we style trees. So, right off the bat, we put a tree in a pot, and in doing so we have removed it from world of reality and into some level of abstraction, even if we do nothing else. We could go so far as to put a pot of soil out and let the wind blow in whatever seeds it wants and come back in ten years and see what happens, but you can’t get around the fact that someone made the pot. So much for being completely natural. 

Now that we have that tree out of the relative comfort of the ground and into a stuffy, confining pot (which might actually provide much more comfort and stability than it ever had in the wild) we have some decisions to make. How much are we going to intercede on the behalf of both the tree and art, to make a bonsai? 

We have to decide what our goal is, even with each individual tree, and what we want to represent. Do I want to create the sensation of standing on a certain mountaintop where that tree came from? Am I trying show off the beauty of its blossoms? Do I want to show it all full of vigor and health, or is it barely surviving? And more to the point of this article, do I want to show it as a highly stylized abstraction of what a tree can be, or simply represent the singular specimen that it is? Is this tree going to announce itself or just sit quietly in the corner? Will it be highly sculptural, creating defined, consistent shapes or just a, grow as you may, haphazard style?

Culture definitely weighs in heavily on what we want to see. The Japanese refined the art of bonsai through technical prowess and cultural sensibilities. The technical aspects of growing and maintaining bonsai speak for themselves. Plants don’t change the way they work, so we have to learn to work with them, to support our efforts. But the cultural aspect is something that we can control. A good place to start is with Japanese aesthetics. They have learned how to evolve their trees into a style that is both pleasing and maintainable over hundreds of years. But even that style is ever changing, and different among various practitioners. 

The Japanese, it would seem, crave a peaceful balance, with not a hair out of place and as close to perfection as possible. Take for instance, putting moss on the surface of a pot for exhibition. It definitely makes things look better, but for the Japanese, the thought of bringing dirty soil seen on top of the pot into their home is quite unfathomable. Contrast that with myself, who regularly piggy-backs dirt into the house from my waffle stompers. Cultural habits are different and lead to varying aesthetics.

So, back to the trees. Take a look at Mount Rainier 1, the usual view represented of themountain. It’s basically what you see along I-5 especially from Seattle. Then there is view number 2, which I took much closer to the mountain on the southwest side. Doesn’t even look the same. I choose rather consciously to represent the mountain in its most familiar form on tee shirts so that folks recognize it. I myself would be much less recognized by my back side, than my front. That is a constant that I have chosen.  

Rainier 1  

Rainier 1  

  Rainier 2

  Rainier 2

Now take a look at Rainier Park. Do you recognize the mountain? Yet I traced it from the very same views. I just used a few straight lines is all, but it’s the same. Even though its roots are in a very real mountain, it is really just the suggestion of ANY mountain. The shapes are broad and highly stylized, even the trees are just one step away from Christmas ornaments. 

Now observe Rainier Pixel. It’s definitely based on a photo, something we would call real, but now the resolution in some places gets very coarse and you can barely make it out. This focuses your attention to the peak, very much in the same way that we use foliage to frame a piece of deadwood or control the way that our eye flows through design of a tree.

Rainier Park

Rainier Park

Rainier Pixel

Rainier Pixel

Then there is Sketch Rainier. This one is totally made up of lines with no shapes at all. If you get to close, it’s very difficult to decide which is a positive or negative shape, but it becomes much more interesting, and even refreshing with that push/pull aspect.

Sketch Rainier

Sketch Rainier

Puget Sails

Puget Sails

Then there is Sketch Rainier. This one is totally made up of lines with no shapes at all. If you get to close, it’s very difficult to decide which is a positive or negative shape, but it becomes much more interesting, and even refreshing with that push/pull aspect.

 Scott Elser

Spring Show in New Home 

Our annual spring show returned to the Japanese Gardens one fine, rainy weekend in April. Back to the garden, but in new quarters, as our display was divided into two separate rooms across the new plaza, plus an outdoor display by Brian Lonstad. It was a great success, even though it featured fewer trees than we are used to. We saw many new trees and several new exhibitors. 

Folks had a really good time during the day visiting with attendees and Saturday evenings critique was a great hit. During the critique, we voted on the best trees, shown below. Congrats to all of the winners and many thanks to all who participated, either by showing trees, helping set up or take down, tree sitting, and demonstrations. We hope to expand further into the plaza next year with more outdoor displays. Thanks everyone!  See the May Newsletter for the photos of the winners.

Scott