Jorō spiders can grow up to 4 inches — about the size of the palm of your hand or larger — and they could spread into the northeastern United States, including the Philadelphia area.
PHILADELPHIA — The itsy-bitsy spider climbed up the waterspout … and all across the East Coast- and could spread into the Philadelphia area! Except, in this case, the spider in question is not so little, according to Benjamin Frick, coauthor of a study of the Jorō spider species published in the journal Physiological Entomology.
Jorō spiders are not a threat, and there is no data to prove they are harmful to the environments where they’ve moved, according to Frick. These spiders can be considered more of a nuisance, as they build three-dimensional webs in open spaces such as some hiking or biking paths, Cushing said. Jorō spiders can tolerate a brief freeze, but not much more, said Anne Danielson-Francois, an associate professor of biological sciences at the University of Michigan in Dearborn. She was not involved in the study.
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