Researchers discovered two new parasitic wasp species living in the U.S., tracing their origins back to Europe and uncovering clues about how they spread. Their arrival raises fresh questions about ...

Growing Degree Days (GDD's): None available at this time. The leaf galling stage of this insect may be missed during monitoring. The golf-ball sized woody stem galls are unsightly, easily noticed ...

A horrifying insect soap opera with vampires, mummies and infant-eating parasites is playing out on the stems and leaves of live oak trees every day, and evolutionary biologist Scott Egan found the ...

Scientists have identified two previously unknown species of parasitic wasps spreading across the US, from New York to the Pacific coast. Originally from Europe, these tiny predators lay their eggs ...

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Many coast live oak (Quercus agrifolia) trees are showing unusual browning in their canopies in the last month or two. If you look carefully, you may see small, crescent-shaped galls forming on the ...