Small Cabbage White Butterfly (IMAGE) University of Tennessee Institute of Agriculture Caption An unassuming, small, white butterfly is among the world's most invasive pests affecting crops like cabbage, kale and broccoli. A newly published study in the Proceedings of the National Academy of Sciences? (PNAS)? documents how humans have helped Pieris rapae, the small cabbage white butterfly, spread across the globe for thousands of years. Credit Image by Lauren Nichols, Department of Applied Ecology, North Carolina State University. Used by permission. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.