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Are grubs ever good?

Posts: 75
Location: Nara, Japan
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We have a lot of trees in pots close to our house until we build a deer fence. The weeds in the cherry tree's pot were too easy to pull, sure enough the pot was full of grubs! I picked them all out.

When I find them in the ground, I generally toss them toward the wilder part of the garden. I used to have a dog that loved to eat them.

I know that many species look similar. When I lived in the US, we assumed they were Japanese beetle larva and threw them to the dog. Living in Japan now, I guess they are just beetle larva. They are called  マメコガネ, Mamekogane-mushi, 豆黄金 golden beany bug. I have noticed a few here and there, but there aren't the problem they are in Vermont...

Do grubs turn into anything beneficial?

What do you do when you find them?
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grubs from a potted cherry
master pollinator
Posts: 11365
Location: Central Texas USA Latitude 30 Zone 8
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We have giant grubs who turn into Ox Beetles.


When I accidentally dig them up I put them aside under plants or leaves.
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Location: Ladakh, Indian Himalayas at 10,500 feet, zone 5
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We get a lot of fat grubs in manure or garden soil here in the Indian Himalayas, so I did a bit of googling around to figure out what they were. These ones don't seem to eat roots or harm plants; they seem to be only eating organic matter, and leaving little castings that look just like mouse droppings. I think their adults are big bumbling egg-shaped blackish beetles that bump into walls at night in summer. I think they are a type of chafer beetle, but there are many species of chafer beetle, so that doesn't say much. Googling "chafer beetle" and "chafer beetle grub" might give you some leads on further information.

If your weeds were coming out too easily because the grubs were eating the roots, then yeah, you might want to reduce those. Even though these grubs here don't seem to harm plants, I find them yucky as grubs and annoying as adults, so when I find them in the soil I throw them out on the empty desert, and usually a magpie will come and snap them all up.
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Location: Vilonia, Arkansas - Zone 7B/8A stoney, sandy loam soil pH 6.5
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I think it depends on where you are which grubs (larvae) you have. In the US most of the ones I find in my gardens are not "ok" to find, those all get tossed to the chickens.
We do have some good guys (Cicadas) but they are easy to tell what they are when you find them in the larval stage, those guys get left alone or replaced in a better spot for their development.

entomology UKy
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