"Peter" wrote in message ...
But why won't it do anything for existing grubs? I read that it kills
grubs. Also, the new infestation is under way, the beetle population peaked
last week and the eggs shouls start hatching grubs any day now. What I
understand, now is the best time to apply Merit.


Peter:

Part of the answer is on the package label for Bayer Advanced Lawn
Season-Long Grub Control, which says:

"HOW TO USE TO CONTROL GRUBS:
"WHEN TO APPLY: Apply once anytime from May through mid-August. For
best results, apply Season-Long Grub Control before grubs... hatch.
Contact your County Extension Agent for the ideal dates to apply in
your area."

What the label doesn't say is that if you already have any but the
smallest of grubs chewing on your grass roots, the Merit stuff won't
have any significant effect on them. However you can kill them with
something else, such as Bayer Advanced Lawn 24 Hour Grub Control (in
which the active ingredient is Dylox). If you have yellow or brown
patches developing in your lawn, check to see whether there are grubs
in the soil below. If there are, zap the whole lawn with Dylox, which
will clear out all the active grubs. The Merit you already applied
should take care of any new grubs that hatch this year.

Next year you may do better to apply the Merit product earlier in the
year, before any grubs hatch - exactly when depends on your location,
but there's no harm in being two or three weeks early, and a lot to
lose by being two or three weeks late.