by Paul Cherubini » Wed Jan 28, 2009 11:49 pm
Nature is not in balance when the predators are from overseas and have no natural enemies here in the USA as is commonly the case with wasps in residential yards. Below is what I found on the April 19, 2004 Monarch Watch Update:
Whitney Cranshaw, an economic entomologist and specialist on garden insects at Colorado State University, recently (6 April) made the following observation on ENTOMO-L, a list serve for entomologists:
"I don't think there has been any introduced insect that I have observed in my 20 years here that has so rapidly spread and impacted insect life in Colorado than Polistes dominulus (a.k.a., the European paper wasp). First observed in the state 5 years ago it is now found in every town, on both sides of the Continental Divide, and is extremely abundant. It has extirpated essentially every [butterfly] caterpillar in Ft. Collins by mid-July in the past 2 years and I am sure is having a major ecological impact."