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Another Painted Lady Irruption in the Upper Midwest

One month after the last Painted Lady irruption in the final days of June, another generation, perhaps even larger, suddenly emerged in central Iowa on July 29 and 30. I went out on a survey and collecting trip in Story and Boone Counties on the 30th, and found hundreds of fresh butterflies milling around and flying across Highway 17 and other local roads between Boone and Luther. There was also a large emergence between Polk City and Ankeny, with perhaps 200 along a stretch of highway between these towns. Hundreds were also observed along Interstate 80 in eastern Polk, Jasper, and Poweshiek Counties, but there were very few along I-80 farther east in Iowa and Johnson Counties, suggesting a somewhat localized irruption so far. Many of the butterflies seen along I-80 were flying north, but others were flying in various different directions.

Farmers in our area continue to have problems with "thistle caterpillars" feeding on their soybeans. While I was out monitoring ...more ↓

Posted on July 31, 2019 20:01 by iowabiologist iowabiologist | 2 comments | Leave a comment
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The Vanessa Migration Project is an opportunity for you to share your observations of Vanessa butterflies to find out how they migrate and distribute themselves across North America each year. We are tracking the movements and seasonal changes in their ...more ↓

Mini iowabiologist created this project on March 29, 2016

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