Dry spots on the Pyracantha (Firethorn) leaves

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USDA Zone
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This shows up on the leaves of this year. Initially, the tip of the leaf dries up, and then almost the entire leaf. The lower leaves are affected (leaves down the branch).
Pyracantha is in inorganic soil for the first year and grown from a stump. What could it be, a fungal disease or root problems?
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Location
Los Angeles, CA
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9
I'm having the same problem. Did you ever figure it out? I originally thought mine might be overwatering or maybe used too much neem oil. Curious to see what you came up with. Hope it's cured!
 
Messages
125
Reaction score
17
USDA Zone
5a
I'm having the same problem. Did you ever figure it out? I originally thought mine might be overwatering or maybe used too much neem oil. Curious to see what you came up with. Hope it's cured!
I have tried various fungicides, including against Phytophthora on the roots, and also slightly reduced watering. Finally, I managed to get rid of it by the middle of summer.
 
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