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 (Bonide Systemic fungicide) would control it.

Phyllosticta

maple phyllosticta

maple phyllosticta

maple phyllosticta

maple phyllosticta

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