Striped needles on jwp

[Jayhawk]

I’ll post the same as on another thread.

@Jayhawk

Possibly fungal? Search needle cast and general fungal treatments for Bonsai. There are several fungi that attack JBP. Best protection is to protect and prevent infection on the new needles with a preventative fungicide spray. I also have used a granular systemic, but I’m not sure if the pines can uptake it on a reasonable timeframe and the effect on mycorrhizae.