Jack pine budworms
Jack pine budworms (Choristoneura pinus) are moth larvae that feed on the needles and buds of jack pine trees, causing defoliation.
Japanese beetles
Japanese beetles (Popillia japonica) are invasive beetles that feed on a wide variety of plants, skeletonizing leaves and damaging crops.
Jerusalem crickets
Jerusalem crickets are large, flightless insects in the genus Stenopelmatus. Despite their name, they are not true crickets and are native to western North America.
June beetles
June beetles, or June bugs, are scarab beetles in the genus Phyllophaga. The adults feed on foliage, and the larvae (white grubs) feed on roots.
Jumping plant lice
Jumping plant lice are small insects in the superfamily Psylloidea. They feed on plant sap and can be vectors of plant diseases.
Jumping spiders
Jumping spiders are not insects but are commonly encountered arthropods in the family Salticidae. They are known for their excellent vision and agile movements.