Thursday, October 11, 2012

Elder Blues

I got a call about a sick 'Alder' tree that was just about dead, turns out the tree was a Box elder, a type of maple tree with compound leaves that don't look like a maple. This tree is very confusing. It's also the number one victim of the new Polyphagous Shot Hole Borer (PSHB).  This pest is just hideous and seems to be gaining new victims (known in plant pathology circles by the innocuous term 'hosts') every month.I asked the caller to send me pix of the tree by email and sure enough, it was infested with  PSHB.

Here are some of the pix he sent me:

The Box elder's confusing leaves. 
Notice the dark wet-looking patches with the mounds of sawdust in the middle of them. 

An even better look at the oozing and the sawdust spots. 

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