Japanese Maple – White Spots on Leaves

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Japanese Maple – White Spots on Leaves

Q: What are the “white spots” on my Japanese maple leaves? Just noticed them this week.

A: It’s a fungal disease called phyllosticta. It is unsightly but is rarely a big problem on Japanese maples.

Only under certain combinations of temperature and humidity will it appear. In the future, use slow-release, organic fertilizers so there is not so much lush growth at one time in spring.

My guess is that a couple of sprays of propiconazole (click for sources) would control it.

Phyllosticta

maple phyllosticta

About Gardening: Japanese Maple; Japanese Red Maple; Red Maple; maple tress; White spots on underside of maple leves; white spots on back of maple tree leaves; dying maple?; white spots on phycosleaves; white spots on leaves of king crimson maple tree; spots on Japanese Red Maple leaves

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