Attack of the Green June Beetles

By: Julie Day
Green June beetle on leaf

Green June beetle in my vegetable garden.

After a hard, summer rain, I headed out to my garden early to pick vegetables. By midsummer it was a bit of a jungle; and I had charged well into the tangle of tomato plants before I heard and saw hundreds of huge, green June beetles swarming and buzzing all around me!

My first response was to duck-and-cover; but I quickly realized that to the June beetles, I was nothing more than a party pooper – getting in the way of their frantic eating, mating, and egg laying.

About Green June Beetles

There are several different beetles which are referred to as “June bugs;” but green June beetles are the giant, greenish, iridescent ones that are nearly an inch long. June beetles lay their eggs in rich, sandy soil; and the adults often emerge after a hard rain to feed on fruit. As I looked from my garden over the adjoining pasture; I could see thousands of beetles flying low over the grass, looking for mates and good places to lay next year’s eggs.

Adult green June beetle

Adult green June beetle.

Adult green June beetles do most of their damage to ripe fruits – tomatoes, figs, berries, apples, peaches, plums, and even corn. A few June bugs flying around your yard is usually nothing to worry about, but they can be particularly problematic in orchards, where their feeding and waste can ruin a good fruit harvest.

For egg laying and grub activity, June beetles are drawn to rich soil; and they can become a pest of lawns, golf courses, and playing fields. June beetle larvae fall in the general category of “white grubs.” They’re distinctive not only because they’re huge (up to 2” long), but because June beetle larvae crawl on their backs with their feet in the air.

If your lawn has a white grub problem, you may find June beetle grubs among them, but they’re likely to be far outnumbered by other, more damaging grubs such as Japanese beetles. The larvae eat decaying organic matter, rather than plant roots, so their damage is mostly caused by tunneling and disturbing the soil under the grass.

If you only have a few beetles, the grubs can actually act as beneficial aerators of the soil. But if the infestation is severe, tunneling by white grubs can begin to cut off contact between the soil and grass roots. Like other white grubs, June beetle larvae are active in the fall and spring, while adults are active in mid to late summer.

Green June beetle on sunflower

Green June beetle on sunflower in my garden.

How to Control Beetles and Grubs

In my own garden, the June beetle air raid was over almost as quickly as it began, and I didn’t notice any damage to my vegetable crop. They congregated mostly on my sunflowers, which were nearly done for anyway. While I scared a few out of my tomato plants, they didn’t seem to be destroying them.

To check for green June beetle grubs, dig up flat sections of sod several inches deep. If you see upwards of 10 grubs per square foot, your lawn may be suffering. The best time to control adult beetles is in the summer when they’re most active. Beetle grubs should tackled during the early fall.

Here are some tips on how to control beetles in your lawn or garden:

  • Keep Lawn Healthy: Overseed bare spots to minimize the damage caused by grubs. In mild cases, this might be all you need to do to get beetles under control.
  • Till Garden: If grubs are taking over your compost-rich garden soil, try tilling in the fall and again in early spring. The birds will appreciate all those tasty grubs you unearth!
  • Nematode Control: Nematodes are microscopic parasites, and several kinds are known to attack white grubs. Be sure to choose a species rated for June beetle grubs, and follow the package instructions.
  • Natural Predators: A type of digger wasp, Scolia dubia, loves to parasitize June beetle grubs by laying eggs that hatch and feed on the grubs. Sometimes called the blue-winged wasp, these wasps are most active in early fall, usually flying around low to the ground in search of grubs. To encourage natural predators, like wasps, avoid the use of broad-spectrum chemical pesticides.
  • Chemical Control: If necessary, there are chemicals available that are applied in the fall to control green June beetle grubs. Also, during the adult flying season, pesticide soaked overripe fruit can be placed around the perimeter of orchards to help control adult beetles.

Further Information

Print


Comments

Please Leave a Comment

7 Comments on “Attack of the Green June Beetles”

You can follow comments to this article by subscribing to the RSS news feed with your favorite feed reader.


  • glenn398 Says:
    September 19th, 2015 at 10:18 am

    They came in on my mimosa tree by the hundreds and landed on the trunk. I took my shop vacuum and they just sat there as I vacuumed them up as long as you don’t touch the trunk. I found out why as when a bird lands on the tree that little vibration is the same as you touching the trunk. After vacuuming all day then all I had to do was spray a little poison into the canister and done. If you don’t like to do this wait for late night and dump them into a plastic bag as they are totally dormant by then. I don’t like to use poison so this system worked great.



  • Dave J Says:
    August 26th, 2015 at 9:10 am

    I live in LaVerkin UT, and around July I get the green June beetles flying around my garden in droves. Recently I noticed two peaches that were infested. I put about 3 inches of water in a bucket then swatted the peaches into it, I counted 47 beetles. Scary huh? To control them the first thing you need is to not be afraid of them, they don’t bite .I have sprayed them with Sevin, it works wonderfully. The beetles start dropping in about 3 minutes and it lasts about three weeks on peaches, so be sure to wash the peaches well or peel them. To kill the grubs I have used the milky spore and my lawn looks great except for the crabgrass. I have plenty of neighbors around who don’t raise gardens or fruit trees so they have little problem with beetles other than an occssional buzzing. I am looking for an organic way of trapping and killing these nasty, destructive, although beautiful pests.



  • DEBBIE Says:
    July 20th, 2015 at 1:12 pm

    THESE BIG GREEN FLYING JUNE BUGS ARE TERRIBLE IN MY BACK YARD. I CAN’T EVEN GO IN MY POOL BECAUSE THEY DIVE AT ME AND WON’T LEAVE ME ALONE. PLEASE HELP ME! HOW DO I GET RID OF THEM.



  • molly Says:
    June 14th, 2015 at 11:07 am

    I am so scared of these stupid bugs. I can’t even enjoy summer. My neighbor has fig and fruit trees everywhere, how can i get rid of them?



  • Henry Says:
    May 26th, 2015 at 9:04 am

    I have the same problem as above. I want to sit out in my garden but can’t because every time I try and relax a big June bug comes buzzing in my ear 🙁 so now I am hiding in the kitchen trying to google any tips on how to get rid of them!!



  • Lorraine Says:
    May 25th, 2015 at 6:19 am

    Hello
    I live in the UK, and every summer for the past 2 years I have noticed these big green looking flying beetles, there bodies are very hard looking and a mettalic shinny green, they fly arroung in tree to tree, my neighbours, I have not seen these things before, and I cannot enjoy my garden anymore 🙁 They come out when its very hot and sunny,



  • Peggy A. Jackson Says:
    June 23rd, 2014 at 8:33 am

    I am having green beetles in my garden/on my deck and yard plants eating away. I live in Metro Atlanta GA. What chemical can I use to get rid of these pests. Thank in advance for your assistance.

    Peggy A. Jackson
    Riverdale, GA


We want to hear from you! In addition to posting comments on articles and videos, you can also send your comments and questions to us on our contact page or at (800) 946-4420. While we can't answer them all, we may use your question on our Today's Homeowner radio or TV show, or online at todayshomeowner.com.