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Japanese Beetles BOLO Matt Rodriguez, Extension Agent, Horticulture
It’s almost time for Japanese beetles to be
returning in early June. If you are not familiar with these invasive species, they are the emerald iridescent bugs that eat away at plants in most of the eastern US. The insect begins its life cycle among 40 to 60 eggs in the soil and in about two weeks (provided the right conditions: wet and warm) the grubs that hatch can be a pest on some lawns. Japanese beetle grubs are not normally dangerous to home lawns, so no need to worry in that regard. Those interested can utilize our White Grubs in Turf webpage from NC State Extension Turf Files for more information on best practices to control these species.
Japanese beetles (adults) do not discriminate when it comes to food and can damage various plants. They target fruits and vegetables as well as leaves and flowers. Some favorite menu items include
hibiscus, roses, crape myrtles, and linden. These insects munch away at the leaves causing a “skeletonization” effect. While most established ornamentals are not at risk to any long term issues health wise. The look of these “lacy” leaves can be unappealing and frustrating to homeowners and avid growers.
There are some treatments available to help deter and manage Japanese beetles. As always the best option is to plan smartly and choose resistant varieties of plants for your space. It’s important to remember that the adults are not looking to only eat. They are looking for other beetles. If you see some starting to congregate on your plant then just shake or hose them off. This decreases the likelihood of other beetles coming and damaging the plant. Japanese beetle traps can be used,
however they require maintenance and should be emptied often (one to two days). Be mindful that these traps can do more harm than good as they are an attractant, so they will bring Japanese beetles to your yard.
Short term applications of Sevin and other insecticides can be utilized but must be reapplied after 1 to 2 weeks. Be mindful of pollinators when using insecticides and remember the label is LAW!!
As always do not hesitate to call our office at 828-764-9480 for more information.
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