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treeseer

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For those of you who are not in ISA, here's an article from the last Arborist News. Real Tree Men DO care for shrubs!

DD: The Case of the Waning Waxmyrtles

It was a warm summer afternoon, just right for musing over the nursery catalogs, looking at new cultivars of shrubs. The aroma of gardenias wafted through the screen door and into my nostrils, latching onto the olfactory bulbs attached to my cerebral cortex. I drifted back to fragrances past—Osmanthus, Jasminum, Illicium… “Rrrrip! Crash!” The noise tore me out of my daydream and away from my desk. I ran down the hall to the back door. There I saw Codit sprawled on the ground, surrounded by a spilled sackful of roots that we’d ungirdled from tree trunks.

The handle of our air excavation tool was painfully placed in his lap, and the business end was stuck through the screen door. “Codit”, I yelled, “How many times do I have to tell you—tools go back in their cases before they are moved.”

“I’m sorry Mr. Dendro”, Codit replied. “I was trying to get the samples into the lab so we could get to dinner.”

“There’s always time for safety” I reminded him. “ANSI Z …” The telephone rang, so I closed the door to keep at least some of the insects out and left Codit to straighten up the mess while I took the call.

“Detective Dendro, I am losing my screen, and I don’t know what to do” the voice on the other end said.

“I know how you feel; I’m losing mine too” I muttered under my breath, still peeved about the torn door.

“My waxmyrtle hedge is dying, and our landscaper doesn’t know what the problem is” she continued. “The two on the far end died a while ago, and now the rest look sad. We cannot lose our hedge; it’s all that protects us from the glare of headlights and marauding dogs and…”

“Give me your address, ma’am, and we’ll be right over”, I assured her.

Report form in hand, I went back to Codit, who had just finished stashing the roots under the dissection table. “Codit, load the tools, and don’t forget our reference books. We are off to see some waning waxmyrtles, Morella cerifera.”

“Yes sir, Mr. Dendro” Codit replied as he packed our gear into the pickup. As we tooled down the road, he asked “Er, isn’t that genus name supposed to be Myrica?”


“Good question, but that genus name has changed to Morella” I told him. “Maybe it resembles a tasty mushroom. I am sure there is a scientific reason for these name changes by taxonomists, but some say they are for their own job security.

“What are we messing around with shrubs for--aren’t we arborists?” Codit wondered.

“Speaking of job security, managing shrubs diversifies an arborist’s services and fills in nicely between tree jobs.” I told him with a wink. Shrubs are an arborist’s business. Our training in tree care qualifies us to handle smaller woody plants, like shrubs and even vines. We can apply that expertise to the benefit of our clients—and our own bottom line.”

“Okay, but why do we have to be late for dinner?” Codit complained

“We are going to the client’s home directly after her call for three reasons. First, her plant problem is at the front of her mind now, so she is primed to tell us all she knows. Second, she is home, so she can give us the site history. Third but not least, she will be willing to pay us well if we show that we are committed to cracking the case.”

We parked along the curb, promptly spotting the problem plants. They were lined up along the sidewalk and blocked the view to the first floor of the house. The shrubs on one end did look the worst. My eye went down the line of plants, noting foliage color and density, bark texture and color and the location of the berries and the dead twigs. My eyes got to the end of the hedge just as the client walked around it.

She was the kind of woman that gave a man 20-10 vision. Her cheeks had a pink blush like mimosa flowers and her bright green eyes sparkled like sunshine on chlorophyll, though they were clearly clouded by her waxmyrtle worries. As we approached, I caught a whiff of bayberry perfume.

“My name is Myra Baymont. Detective Dendro, I presume?” she inquired, grasping my hand. The electricity licked my palm and shocked me back to action.

“Yes Ma’am, at your service.” I smiled back. “This is my assistant, Codit. We see that your hedge is not doing well. Has it always been cut flat like this?”

“Yes, they’ve been shaped like that ever since they started to grow tall” she answered. “That’s how our landscaper does it. We planted them eight years ago, and the two under the trees died soon after. The rest looked all right until recently. They gave us a privacy screen, shade, shelter from storms, erosion and noise, air cooling and purification, and wildlife habitat, and they looked so pretty! Then we noticed dead branches, and asked our landscaper what the matter was. He thought they might need fertilizer, so he fed them…”

“He didn’t really feed them. Fertilizer is like vitamins and minerals. Sunshine makes tree food” Codit interrupted.

“My assistant is learning some things well” I said. “Codit, we cannot prescribe action until a Root Collar Examination is done. First comes the RCX, then the Rx. Please remove those dead inner branches, and remove the leaves and mulch from the bayberry stems, so we can get a good look at the flare. Look carefully for discoloration on the stems.

“Bayberries? I thought these were waxmyrtles” Myra said. “Which are they?”

“Both” I told her. “Common names can be confusing. Scientifically speaking, they are Morella cerifera. The northern species is Morella pennsylvanica. Because it takes nitrogen from the air it grows well in poor soil, so it’s popular in urban areas. Candleberry is another common name. Its berries are waxy enough to make candles, after oils are taken out for other uses. Do you wear that perfume often?”

“It’s my favorite fragrance” she replied. “I never knew it came from my favorite plant. Now, can you tell me what is wrong with my Morella? I do not want to lose them.”

I crushed the leaves and sniffed the aromatic oils. I rolled the berries between my fingers, feeling the wax. I flexed the branches, snapping the dead ones and scratching the bark to check the living ones. I ran my fingertips over the lichens and looked for symptoms on the stems. I dug up a little soil, rolled it in my hands and smelled it. I focused my hand lens on the roots, looking for those nitrogen-fixing nodules and more. I studied the slope of the site, and the sidewalk a slight distance away. I looked at the plants’ form—dense and flat at the top, sparse and narrow at the bottom. Then I thought of having champagne and orange juice with my Saturday morning breakfast, and I knew the answer.

Turn to page one zillion and five for the answer.

can you guess what it is?:monkey:
 
Grizzly said:
It's more of manicuring for the bushes instead of trimming.

I prune some shrubs just like trees.

Rhododendron means Rose & Tree.

Many natural species have a tree form and can be done exactly like a tree.

English laurel, Photinia, etc.. Phitzer juniper, etc., etc..
 
treeseer said:
Then I thought of having champagne and orange juice with my Saturday morning breakfast, and I knew the answer.

can you guess what it is?:monkey:

A mimosa??? A good way to ruin orange juice? A treeguy who drinks first thing in the morning?


Oh,,, the bushes,
[quote, treeseer]Scientifically speaking, they are Morella cerifera[/quote]

Scientifically they are Morella cerifera. Genus and species names, when typewritten, are always italicized. If handwritten the genus-species name is underlined. Even a genus name without a species should be italicized, genus capitalized, species lower case. Genus speciosa. Mimosa gobacktobeddica.

These plants like full sun. I think the landscaper pruned them down like you would boxwood. The densification caused the plant to overshade itself, causing the lower branches to die out. This plant likes to grow upward like a good ornamental tree, not a low shrubby bush. Also, it's a leguminous plant, just been fertilized. Possible fertilizer overdose. Too much of a good thing.

That's my asessment, Dr Dendro.
 
Last edited:
re: Tree Machine

I think you struck a chord with my partner. Shes just completed writing her PhD thesis :givebeer: , as far as I can understand about the taxonomy of two closely related species, so woe betide anyone who doesn't underline or italicize binomial names. She will be along to the APF show to hand out b......ings to any sinners (just had to endure another lecture on the crime).

Matt.
 
thanks for picking that binomial nit; it was italicized before it went to print earlier this month.

tm you're right, tho many whack these into bushes and get away with it. The point of the article was that the topping aggravated the spread of the disease. It was the disease that was the major problem. We will be trying some fungicide on it experimentally if it gets worse.

The plantamnesty tip at the end of the story was one I hope folks will pick up on; an excellent org with a wealth of info on shrub mgt. o and tm, mimosas are not my favorite drink, but i wanted to tie it in to the related wilt disease. If you want to see pictures, get a copy of the Aug Arborist News. And Dendro does not drink on weekday mornings, but on weekends he'll have a taste with his omelet..

o I thought I posted the rest of the story already. Here it is...

“Hey Mr. Dendro, I found dark blotches on the bottom of this stem, and gray patches higher up” Codit told me. “And this dead one has big holes in it.”

“Excellent observations, Codit! The gray patches are lichen, a harmless associate. The holes in the dead branches are nectria canker, a secondary stage of the disease. Those blotches are signs of Fusarium oxysporum, a pernicious perennial pathogen. Our culprit is a close cousin to mimosa wilt, which in fact is named perniciosum. The disease is called a vascular wilt because it infects the vascular, or circulatory system. Codit, please pull out your pocketknife and peel back the bark on that infected branch” I told him, letting Myra look through my magnifying glass. “You will see the inner bark stained a light brown, just like this picture on page 248 of our disease book. The stains may be worse under the blotches, on the side with the dead branches.”

Codit did as I suggested and showed Myra the evidence. “But what can we do to save my shrubs?” she pleaded, her gaze going from the soft stems to the pictures and back to me. “I don’t want to lose them.”

“First, Codit will finish taking away the leaves and extra mulch that keep the stems moist and dark, an excellent habitat for this fungus. Next, we’ll remove the dead branches that impede our investigation. Then we’ll look closely at the stems to see how infected they are. There are chemical products that can control mild infections, but since this is a soil-borne disease they won’t totally knock it out. The treatment may be expensive over time, so replacement is an option to...”

“Look, a black snake!” Myra said, clutching my arm to her side. I could feel her heart beat faster, and mine started beating like a big bass drum.

“That’s no black snake ma’am, that’s a drip irrigation hose” I assured her. “Black snakes are beneficial associates to your shrubs, because they eat rodents that could chew the bark. The hose that Codit is removing was watering the base of the shrubs, so the irrigation and extra nitrogen in that fertilizer has sped the spread of the disease.
No other plant will get this strain of wilt except waxmyrtle, as it is host-specific. Here’s what I recommend.” I said, handing her my prescription:

1. Improve the soil to correct the poor drainage from the compaction close to the sidewalk.
2. Apply supplemental irrigation and fertilization away from the stems, out to beyond the dripline.
3. Prune them to restore their natural shape. Waxmyrtles can be twice this tall, making more of those contributions that you conceive so keenly. Few taxa take kindly to constant crewcuts. If air and light can’t move through the plants, the inner branches die, and disease spreads.

“The infections are older at the shady side of the hedge—that’s where Codit found the nectria canker--but are spreading down the line and affecting plants in full sun. Shear madness has aggravated their condition, so we will specify pruning that maintains a natural form, as advocated by Cassie A. Turnstroemia at Plant Amnesty. Topping is harmful to waxmyrtles, trees, and all woody plants” I said, catching Codit’s eye.

“Thank you, Detective Dendro” she said gratefully. “Please work with my landscaper, and bill me for your time.”

Codit loaded the tools and the samples of infected stems and we drove back to Clarice’s for dinner. “You were right, Mr. Dendro. Problems with soil, irrigation, mulching, fertilizing, and pruning can hurt both trees and shrubs, and now I will recognize wilt disease when I witness it in mimosas and other trees.”

“You’re learning fast, Codit” I replied. “A healthy tree is a symphony, with all its instruments in harmony.”
 
:clap: :clap: :clap: :clap: Well done, Dr. Dendro!


And for you, Prosopis, congratulate your ladyfriend on completing this major hurdle in her academic career. In all my years here at Arboristsite I have never poked anyone for spelling, grammar or taxonomic oversight, this being the first time, but Treeseer knows Better.

( :D )
 

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