There are several of these "balls" on a fir tree in my yard and I have no idea what they are or what I should do with them. Does anyone know? How harmful are they to the tree? What are they?
its is a juniper.
and its juniper rust.. apple rust...
juniper is a host tree.. and the real problem is on other plants ...
there have been a couple posts directly on point .. i think in the trees and/or conifer forums ...
Juniper-Hawthorn, aka Cedar Apple, Rust is more of a problem on fruiting trees such as Apples and Crabapples. While unsightly on these alternate host trees, Junipers, Hawthorns, Cedars, they really cause no harm. They can be easily controlled by cutting the galls off the tree and dropping them into a sealable plastic bag and sending them out with the trash.
It is most unlikely that any fungicide is necessary since it would have little, if any, affect on the galls now.
Here is a link that might be useful: Juniper-Hawthorn Rust
Thanks for that information. Now I know what it is and what to do about it. This GardenWeb site is invaluable to me!