JAPANESE BEETLES IN THE GARDEN

Japanese beetles (Popillia japonica) are an invasive species that feed on the leaves, flowers, and fruit of more than 275 plant species, particularly those in the rose family. Their larvae, or grubs, damage turfgrass by feeding on the roots of grasses such as Kentucky bluegrass, fine fescues, ryegrasses, and bentgrasses, leading to browning and eventual death of the turf.
​
According to the University of Maryland Extension, while some species of birds do feed on adult beetles, their efforts are insufficient to prevent damage to ornamental plants. Even the best insecticides provide only temporary relief when adult beetle populations are high. Most pesticides remain toxic for only a few days, leaving new plant growth unprotected. Due to the beetles’ continuous migration, 2 or 3 spray applications may be necessary to prevent significant damage to plants such as roses and grapes. Fortunately, many foliage plants can tolerate moderate defoliation.

​For more information on Japanese beetles and how to control them, click the button below.

UNIVERSITY OF MARYLAND EXTENSION – JAPANESE BEETLES