Acer palmatum 'Shin higasa'

Mildew - starts as slightly discolored and spotted leaves and yes, the powdery effect is the mature fungus releasing spores. Affected leaves will drop off. Yes, you can treat for mildew in advance, but that's a lot of chemicals to be spraying (you would have to do it regularly)

I use Bayer Advanced 'Disease Control for Roses, Flowers and Shrubs'. Available at Lowes and other garden centers. Works wonders.

http://www.bayeradvanced.com/rose-flower-care/products/disease-control-for-roses-flowers-shrubs

 

Well, my Shin hikasa seems to be tolerating the heat nicely, at least thus far, as evidenced by some rather substantial growth in only a couple of weeks. But, the leaves on the new growth are MUCH larger than on the rest of the plant (see attached). I hesitate to cut it off since I know it's a slow grower, but I also want to keep the nice tiny leaves... Suggestions/recommendations?

 

remove the big new leaves and the branch,because i see that are under the graft

 

Just went out to double-check, and it's my bad for the awkward camera angle, but the lower branch with the large leaves is not below the graft. It's close, but it is on the 'shin hikasa' wood, and some of the 'original' leaves (from when I got the tree a couple of weeks ago at the base of the same branch) are the small ones. And obviously the upper branch with the large leaves is nowhere near the graft... It's just the new growth since receiving it that is significantly larger (and no, it has not received any fertilizer with the exception of one watering with some very diluted fish and seaweed emulsion).

 

Don't remove the leaves. Many times JMs throw out "juvenile" growth, which has large leaves. These will become small next year. Let the plant grow if it is happy and build up its energy.

 

with the respect of Kaitian :)..the advice of Europeans nurseryman is ,cut the new leaves without similar look to original cultivar,for my experience i vote cut !:)

 

Here is a picture of my 'Shin hikasa' fall colors. Unfortunately, strong winds from the night before took off most of the leaves. I was trying to hold out for peak colors, but in hind sight I should have taken a picture the day before all the wind.

 

Hey, it happens to all of us. Something happens. Your photo shows the colors nicely. Many thanks.

 

Here is some pics of my Shin Hikasa. I had it in a cold frame last winter, and no dieback. It did wait a long time to start growing, and has not stopped. So far no mold or mildew with all the mega rain and humidity we have had.