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I do not see fire blight, yet anyway. It looks more like a rust or a toxicity of some sort. The only "control" for fire blight is to cut it out, and keep the plant healthy as possible. It could spread to near by trees, almost all Rosacea are susceptible.

I had one fail on me, and I decided to let it recover and try again next year. Unfortunately, the callous did not bridge well, and a month after the failure, the top died :( In my case, I should have re-wounded, re-applied hormone and continued on, as this has worked for me in the past. Now I...

This is a rather poor example of a tree sketch, but it is fun for another reason. It is a relatively close sketch of a red bud tree existing in a landscape design I am working on. I sketched it and through photo shop, created a sketch up component that I could use in a 3d model of the site. Now...

could you quickly describe the collection? Time of year, amount of roots, after care etc? thanks! great looking tree!

Some good Terry Pratchett quotes: “Wisdom comes from experience. Experience is often a result of lack of wisdom.” “Steal five dollars and you were a petty thief. Steal thousands of dollars and you were either a government or a hero.” ~Going Postal “Just erotic. Nothing kinky. It's the...

Could be Calocedrus decurrens? Incense Cedar? Though it is called Cedar, it is actually more related to Junipers and Cypress. Its native to the West, but I did not know it grew that far north.

We looked at one in my taxonomy class last week! It seems A. aurucana does well in Davis too! This one is by an older building and may be around 50 years, but has yet to take the umbrella shape yet. They may or may not react similar to Aurcaria heterophylla, the Norfolk Island Pine? not sure...

Here in the central valley they prefer filtered shade in the afternoon. That said, the ones in full sun do well until mid july-august. Its not that they can't take the sun, its just that a good 25 % of the upper canopy gets fried. I think that regardless of climate or zone, they are a best...

I learned recently that cuttings need calcium in the substrate to achieve root elongation. The primary (if not only) source for Ca in inert media comes from the cuttings themselves. As a result, too few cuttings in a flat will create a Ca deficit that leads to poor rooting. Basically, the Ca is...

Haha, this is a good one. I thought it looked opposite too. Are you sure it does not flower? Or has it just not flowered yet? I say this because it looks like the leaves have stipules, which is a major id key for Rosaceae. Could be a prunus. There are cherries with that leaf texture i think? And...

Cool tree. Looks like Cornus to me. Some sort of dogwood, anyway.

I totally agree with the above. I cannot stand the whole "I saw some issues and got this stuff and sprayed, and that thing that was wrong went away!" What you spray and what you are controlling are the key. This lets you use the least toxic method on the market. Often it is a matter of culture...

I would keep the lower two branches pinched back and low, and let one go to about ten feet. Re-pot next spring, and keep the sacrifice stripped of low foliage to prevent shading out the other low branches. Not sure how well the macrocarpa foliage will reduce, so find some elms or flowering...

The other great side of this is that a large patio tree will need at least two major pruning sessions a year, providing great insight into branch architecture and pruning response of maples. Repetition is the key to getting good at pruning, and with a 6' tree, you get to make twenty times the...

Great tree. Looks like the branches have really come along the last two years, can you elaborate? Did you clip and grow, wire, both? Are you letting small sacrifice branches grow out each year and reducing in spring? Perhaps a shot of the tree this winter would show me what I am asking? thanks

this has some odd characteristics. the stems look like citrus, the leaf arrangement could be ligustrum or viburnum, but the flower spike looks like Pieris, and the fruit look like any number of shrubs. maybe the slightly oblique leaf base is a clue? Based on flowers I am changing to some...

I would say viburnum, really could be in caprifoliaceae, but thats as far as I would go. Is it temperate, tropical, old or new world? Is it evergreen? (LOOKS EVERGREEN)

You say this like 50 times a month on this forum, but a little research will show that most horticultural institutes believe this to be false. You prune back to have a shorter trunk, thats it. The only way the above will help, is if you are pruning to fit the tree into a mist bench or something...

Here they are potted up:

I separated two airlayers from a chinese elm I this weekend. Seems like they will make it, but we still have a long hard summer ahead. I got this elm from an aerial root off of a nursery tree when I was in high school. This may be my oldest tree, and as such it suffered many bad styling...

You can only kill scale with sprays in their juvenile stages, when they are moving. After hatching, they crawl out from under their parents corpse and move out onto the leaves to fatten up. After a while they move back to the stems for their adult phase. The picture below was form a lecture I...

I was thinking pear as well. Maybe they cannot beat an apple in flower, but they sure could in the fall. Its worth a shot, for something free.

FOR SHAME!!!! The only one I want to get rid of is my GIS book. Such bad memories that class. If only Arcmap was not so awesome, Id sell that terrible book. Its like 150 new :( This is the current text for my Plant Propagation class. I don't think we need the 8th edition do we? Nope, that's...

Air layer for sure, but use the in ground vigor and time to get character into it. Of course you could try and air layer larger spurs or branch crotches now, ...but I would try to plan it out for 2-3 years. This year you could select a few vigorous shoots, and either through repeated growing...

I like the trunk. In light of Smokes thread, if you want it to look like a valley oak like say this I think you can use that trunk. Another option would be to let it grow out this year unconfined and with little pruning. Then you could save some young shoots at the top to use as thread...