New leaves of Japanese maple turn brown

[Gunda]

Why new growth is turning brown on my Japanese maple? I was thinking it’s sunburnt and put it under the porch, but they keep browning. It’s hot here over 90F.

 

[Srt8madness]

Prob too hot for maples. They can only pump so much water from roots to the foliage.

 

[KikurageOtomo]

I'd have to agree with Str8madness here. Damage seems consistent with sun scorch, starting at the tips and disproportionately so on new, susceptible growth. Your zone is on the absolute highest end of Japanese Maple tolerance, so moving it into a location that doesn't get direct sun during the hottest part of a day (About Noon-3) would likely help.

 

[Gunda]

I'd have to agree with Str8madness here. Damage seems consistent with sun scorch, starting at the tips and disproportionately so on new, susceptible growth. Your zone is on the absolute highest end of Japanese Maple tolerance, so moving it into a location that doesn't get direct sun during the hottest part of a day (About Noon-3) would likely help.

Thanks. I bought this tree in Florida. It’s the first summer I have it. It was growing there nicely. I live in Georgia. I hope it will survive summer heat. It’s just starting here.

 

[Gunda]

Prob too hot for maples. They can only pump so much water from roots to the foliage.

Good to know. Thanks

 

[KikurageOtomo]

Thanks. I bought this tree in Florida. It’s the first summer I have it. It was growing there nicely. I live in Georgia. I hope it will survive summer heat. It’s just starting here.

Positioning of a tree can do a lot relative to even its USDA zone hardiness. Here in zone 5a if I put my Japanese Maples in direct sunlight everything will start scorching. I personally like an area that gets direct morning light exposure and tapers off to shade by the afternoon. Shade cloths are another option if your selection on light exposure in your bonsai space is limited.

 

[Mikecheck123]

Not enough water. Japanese maples can live in 90F.

 

[Gunda]

Not enough water. Japanese maples can live in 90F.

I will keep an eye Thanks

 

[August44]

Dappled shade, no direct sunlight now. If pot is black, cover with some kind of cloth (burlap) and keep it wet. Top dress with sphagnum moss.

 

[SeanS]

That looks like fungus to me. I have plenty of experience in this department. Treat it with daconil, mancozeb or a systemic like Propocanizole. Propocanizole is the only thing that helped with my reoccurring fungal issues last season.

See this post in my trident thread for 2 videos of my fungal issues, see if it matches your symptoms

 

[Gunda]

That looks like fungus to me. I have plenty of experience in this department. Treat it with daconil, mancozeb or a systemic like Propocanizole. Propocanizole is the only thing that helped with my reoccurring fungal issues last season.

See this post in my trident thread for 2 videos of my fungal issues, see if it matches your symptoms

It does look like you had on maple trees. Do I need to cut all new growth off? Right now I only have Physan 20 what I use on my plants. I’ve never used it on trees before.