My Juniper Trees Have Orange, Slimy Balls on Them -- What Are They?

My juniper trees have slimy orange balls on them. What are they?

Pin
Oops, we're sorry. Something went wrong. Please try again later.
Oops, we're sorry. Something went wrong. Please try again later.
Share your take on this idea!
Upload your photo here.
CLOSE

It sounds as though your juniper trees have a fungal disease called cedar-apple rust (Gymnosporan-gium). The orange balls you see are the fruiting body of the fungus. The first year of infection, the fungus forms a brownish-green swelling 1-2 inches in diameter on the juniper branch. The following spring, during warm, rainy weather, the ball sends out jellylike orange projections that produce spores that spread the disease to apple trees.  Cedar-apple rust is not a serious problem on junipers (which are commonly called cedars, although they are not true cedars), although infected twigs may die. The problem is more serious on apple trees, the alternate host for the fungus. The disease can't spread from juniper to juniper or from apple to apple. The disease alternates between the two. 

continue reading below

One way to break the cycle is to make certain that apples and junipers are planted far apart. (In urban and suburban settings, this may be less practical, because you can't control what your neighbors plant.) Another control is to remove the brownish-green balls from your juniper during their first year, before they develop their orange spore horns. On apples, the disease shows up as orange spots on leaves and fruit. Again, the tree is not permanently damaged, but the fruit can be seriously disfigured.

Pin
Oops, we're sorry. Something went wrong. Please try again later.
Oops, we're sorry. Something went wrong. Please try again later.
Share your take on this idea!
Upload your photo here.
CLOSE

More Bugs, Diseases & Weeds

close
close
close
close
close

Loading... Please wait...

Add My Photo close
I Did It!
Share on Facebook
Uh oh! Please pick a jpg at least 600x600px.
Share on Facebook
Uh oh! Your photo failed to upload. Please try again or visit your profile.
No one has shared their photo yet.
close