June 15, 2015

RIGHT NOW is the time of year that emerald ash borer (EAB) adults are active. Here are some photos I took last Wednesday in Willow Grove, Bucks County, PA.

This ash tree had some live branches on it a few weeks ago. Landscape maintenance people have cut and removed them...

June 21, 2012

These pin oaks are shedding leaves, and large parts of some of them have leaves that look white from the ground.  The culprit is scarlet oak sawfly larvae.

I have never seen damage quite like this from this insect.  It’s unusual for it to reach such a high population th...

June 12, 2012

This weeping willow in Harleysville has adult imported willow leaf beetles feeding on its leaves. They won’t cause much damage. But the population of beetles is rather high, and they will soon lay eggs. When the larvae of the next generation emerge from the eggs, they...

June 8, 2012

The way this client found me is a little bit strange.  He found my website by googling “bacterial leaf scorch” (I have articles posted about my experiences with BLS).  That’s what another “arborist” told him was wrong with his ash tree.  And that the disease would kill...

March 14, 2012

Read this article from the Penn State Extension.
See my article from July 27, 2011 to learn what you need to know. And you can read my EAB field trip story at Warren’s Summer Vacation 2010.

October 5, 2011

Renee wanted me to help her get rid of the hornets. So I had to decide how to go about it. The most effective way to control European hornets would be to destroy their nest and colony. But we have no idea where the nest is – probably not even on her property. If we wen...

September 29, 2011

These are European hornets.


I never really thought of them as tree pests before. When I see them on trees, usually they’re feeding on sugar that’s been excreted by aphids or scale insects, or on the alcoholic wetwood flux  oozing from a mulberry or a dying elm. But I m...

July 27, 2011

Have you noticed all those purple sticky traps?

The PA Department of Agriculture has hung them in ash trees all over eastern PA this summer.  My guess is we're going to find out about a considerable range increase for this terribly destructive insect.  Already this year...

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