Today's Mission - Overhaul a Big Blue Atlas Cedar
(Cedrus atlantica 'Glauca')
This big robust Blue Atlas Cedar is unquestionably the best we have at the Museum. Its been onboard for a long time. During the winter it has accumulated a number of issues we want to address in the next day and a half. Here's a couple cheesecake photos before I get down to work.
First the BA Cedar has accumulated a bit of Sirococcus Shoot Blight that needs to be taken care of soon. These little
Sirococcus Strobilinus fungi like close packed needles that hold pockets of moisture, allowing the fungus to breed and spread. The affected needles are very distinctive as they have a characteristic ‘pink’ color and become brown as the season progresses. It took me a bit of time to learn to find "pink needles". Scarlet and Aarin spotted these right off. Practice makes better...! Maybe you can pick these out...
The first work phase had 3 parts tto be done all at once.
Starting at the top I work downwards, plucking out every single infected needle. Then pluck in between the growing rosettes of needles to decrease crowding.... creating space for air to circulate. Finally "push" the protruding branchlets back into the styled form. Knowing the tree needs a full wiring job badly, we didn't push back hard, knowing Ken and Aarin would come in afterward and wire these back into style.
The bywords today are Attention to Detail, Make good decisions, Recheck and redo. Its constant vigilance, assess - pluck - cut back or not... and repeat...
I know the job is done really well when the "starbursts of needles" stand out. See the Cedar's starbursts of needles before and afterwards. There's a distinct difference in color... Left before, right afterwards. Two photos taken 5 minutes apart.
This job took a real long time. Aarin took pity on me at the end of the first day and helped work on one side. He's way faster than me! Thus, the next morning I only needed an hour or two get this phase done.
Next: Scrub deadwood, dry and Lime Sulfur.
This is careful work on a big tree. First as a tall tree, it represents a number of safety hazards due to its height. Second, Lime sufur is a decidely hazardous chemical, burn and respiratory danger here. Thus one has to ensure to wear appropriate PPE at all times. Extra thick nitrile gloves, wrap around safety goggles, long sleeves, hat and a respirator if you have one. Being I've just had laser surgery for a retina tear, I'm doubly aware of the need to take care of my personal safety, especially my eyes! Please remember your PPE.
Out with the toothbrush and scrub. Let dry.... Then apply two coats of full bore Lime sulfur out of the bottle. We applied the lime sulfur with the barn door open, the tree at the door opening and the air mover blowing away. Luckily it wasn't too cold... 44F
Scrubbing the deadwood was straightforword, but the lime sulfur is more exacting.
My inclination was to put a nice layer on the deadwood, not too much, not too little. It turned out I was too generous as the chemical started to run... and drip! UGH! Out with a moist paper towel, or three, or ten and sop up the extra. Over and over again, until every drip and stain was gone. Rookie mistake here! Beware, this stuff is slipperier than it looks! Mopping up can be hazardous. Especially watch where the moist towels go!
You might see a hint of extra lime sulfur under these branches. I took the second shot before I cleaned up my "Oops" mistakes!
Left - scrubbing, Right - Lime sulfur application.
Finally, my last phase is to go over the entire job and check for stray needles I missed. Pluck needles off the clusters, the trunk and the media. Then pull star weeds. After that a rubdown of the pot with a moist cloth. Finally clean up all needles and toss these in the covered garbage. Whew!
The next step is to spray the tree with a fungicide - Subdue Maxx - pricey stuff - to put down the Sirococcus fungus. Some folks are inclined to use Dacinol. Aarin says that's a big no no as Dacinol attacks a Cedar's waxy coating. So... not such a good idea!
Finally, Big Blue will go off to the wiring shop where Ken will likely work on it. I'll see if I can get some photos of that process and the finished tree later.
That's all for now!
Cheers
DSD sends