I don’t keep a very close eye on these but noticed this rusty powder stuff.
if anyone could help id the substance and treatment I would appreciate it.
thanks!
Needlecast ( VARIETY OF TYPES)
CONTROL
Avoid overcrowding of trees and prune to allow for air circulation and light penetration within the canopies of conifers. This reduces damp conditions, where these needle diseases thrive.
Infections can generally be controlled with properly applied fungicide treatments.
Daconyl, Bonide Infuse granular systemic for example!
Timing varies depending on which needle disease is causing the problem. Also, proper irrigation, mulching, and fertilization as needed are recommended to help improve overall plant resilience.