Species Specific > White Pine Bonsai Discussion

Black spots on old JWP needles

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tanlu:
This afternoon I found something I've never seen before, black spots/blotches on old needles of one of my JWP. I can't imagin it being root rot, since it's in inorganic substrate and I only water when necessary. I also read that JWP are substantially more resistant to needle cast/other foliage attacking fungi, so I have no idea what this is. I naturally removed all the infected needles, but I hope this doesn't come back and spread! Pines cannot afford to be defoliated like deciduous!!

Any ideas on what this is??

T

John Kirby:
Spray with fungicide, daconil or even lime sulphur, I would also add a good systemic insecticide to kill any vectors. Good luck, JOhn

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