Knowledgebase
Invasive species? #771121
Asked September 07, 2021, 6:34 PM EDT
Linn County Oregon
Expert Response
Hi Mike,
You have what is known as a 10 line June Bug. It can grow to about 1.5 inches long. It spends much of its time in the soil as a white grub eating roots of trees, shrubs, etc. The life expectancy of this bug is about 3 years with the last part being the adult specimen you have emerging in or around June. They come to mate and lay eggs in the soil and then die.
They can eat most anything during that time and will decay whatever they eat.
I usually see them in July around the farm. They are easy to catch and dispose of and so far I have not seen any produce damage that can be attributed to the adults. On very hot summer days the heat tends to make them sluggish, very easy to catch.
The white grub that hatches can eat any roots they are near. If you check the area where you found this one, by scratching the soil about 1 inch, you may find the eggs which you can remove.
Here are some links about June bugs: https://entomology.wsu.edu/outreach/bug-info/ten-lined-june-beetle/
https://www.insectidentification.org/insect-description.php?identification=Ten-Lined-June-Beetle
Not all beetles are pests. The June Bug or beetle is one of hundreds of species of beetles. Many of of the beetles eat pests and clean up our gardens. It is highly recommended that you do not spray pesticides to kill insects. If it says it will kill one insect the spray will usually kill every insect that would include all pollinators, butterflies and moths.
Japanese Beetles - Here is a link giving you several pictures of these beetles including the white grub. You will note that the white grub of this beetle and the June Bug are very similar.
https://extension.umn.edu/yard-and-garden-insects/japanese-beetles
I hope you don't find any Japanese beetles in your garden. They breed much quicker than the June Bug.
If you have any further questions, please contact us again.