I was standing at Pavilion 1 in Lancaster County Central Park one day early in June when a hackberry butterfly landed on my left arm. Immediately its long, straw-like mouth came out and I could feel ...

Have you seen something that looks like snowflakes on leaves or branches? If you take a closer look at the white floof, you’ll see that they’re actually insects. Asian woolly hackberry aphids can be ...

A student plopped a leaf on my desk, pointed to several green lumps on its underside, and asked, “What are those green growths?” It was a stump-the-professor moment, and in this case, I was indeed ...