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Don’t Let the Junebugs Bug You

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Dr. Tom Weissling

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June Bug on Hand
Photo Credit: ©2004 Buglady Consulting
These clumsy beetles are attracted to lights at night, so turn off your porch light so you can enjoy the warm evenings without the flybys.
Yea! The air is finally warm, and many of us are out late, enjoying the evening. That’s when it happens: Seemingly huge (well, not mammoth) insects buzz past – and maybe even bump into or land on you (especially if you’re near street or porch lights). While it can freak some people out, it’s really not all that bad. It’s just that time of year for Junebug adults to be buzzing about – enjoying the night just like the rest of us. Although these big beetles may startle you, they’re pretty harmless.

Junebugs, or May/June beetles, are the adults of a particular group of white grubs in the genus Phyllophaga. They range in length from ¾-1 ¼ inches, depending on the species. They’re oblong and usually shiny, reddish-brown to almost black.

White grubs in this genus take three years to complete their life cycle. The adults that emerge in late spring or early summer fly around in the evening looking for food and mates. Like many nocturnal creatures, they’re attracted to light – including the one on your porch. After mating, females go into the grass and lay their eggs in the soil. After three or four weeks, the eggs hatch, and lil’ itty-bitty white grubs emerge to feed on grass roots and grow throughout the summer.

As fall approaches, the grubs move down deeper into the soil. This is where they remain until next spring. Once the soil warms up a little, the grubs move back up in the soil to feed on grass roots again. They spend the second entire summer feeding. Then, like the year before, the grubs move back deeper into the soil when fall returns.

Facts
  • There are over 100 species of May/June beetles in North America.
  • The name “May/June beetle” refers to when the adults emerge from their soil homes.
Tips
  • To check your lawn for white grubs, mark off a 1-by-1-foot square in your turf and cut it out like a piece of sod (about an inch below soil level). Peel the grass back and look at the soil and roots for grubs or signs of root feeding.
 
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