Japanese Beetles have finally made it to Minnesota and they're tearing
up the garden big time.
Conventional wisdom says it's a waste of time to treat the lawn for
grubs unless you can convince everybody who lives within 3 miles to do
However, will the grubs do damage to the lawn itself? Should I treat the
lawn just for the sake of the lawn?
Bert Hyman St. Paul, MN firstname.lastname@example.org
If you already know the answer, then why did you come here asking
the questions? Obviously you don't understand the lifecycle of
the insect you're dealing with. Here's a clue: Adult Japanese
that travel miles don't destroy your lawn. The larvae of a variety
of beetles, commonly referred to as grubs, do.
Did you even bother to read my original post? The specific question was:
"However, will the grubs do damage to the lawn itself? Should I treat
the lawn just for the sake of the lawn?"
Are you, in fact, saying that the grubs will, in fact, do significant
damage to the lawn?
Are you, in fact, saying that it might be worth my while to treat my
lawn for the grubs just for the sake of the lawn, even though it won't
do anything to reduce the number of beetles that I find in the garden?
So far, I've seen no evidence of lawn damage that can be attributed to
the beetle larvae, but this is the first year we've seen more than a
handful of the beetles.
I didn't realize that you and the person posting as "." were the same
But that post appeared to be addressing the problem of grubs in general,
with no suggestion that you were talking specifically about Japanese
Anyway, thanks for your input.
One thing you may want to keep in mind.
If you apply a "pesticide" to kill the grubs in your lawn, you'll also kill
every earthworm in the same vicinity. That *does* have some ramifications to it.
Just food for thought.
I'm definately not "anti-pesticide". I just tend to use it as a last resort
because there are usually side-effects, with chemicals, that most people don't
think about, that can have a negative impact. Replacing a problem, with a
different problem, as it were.
25 earthworms per square foot of soil equals about 1 million earthworms per
acre. That's a lotta worms tunneling around under your turf. There are many
benefits to that, not limited to aeration, porosity, fertility (worm castings
rock as a fertilizer), or permeability. They also stimulate nitrogen-fixing
bacteria. Be a shame to lose that, you'll end up applying nitrogen at a greater
I don't use 'em either, other than the systemic stuff (imidacloprid)
that I'm trying on the roses. If the sand cherries and dwarf crab apple
survive the beetle onslaught, I might try it on them next spring. The
clematis and Boston Ivy are done for.
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