Originally Posted by GailC
What you need to do is determine if you really have a problem or not- over 12 found in a square foot is considered problematic. You need to measure out a square foot and pull back the sod to see if you can find three (even better 6-10) in the top three inches. Of course that said this is not the time to do this!! However if you notice damage to your turf in late summer/early fall this may be due to skunks/raccoons looking for the grubs to eat.
As you may be aware the grubs are the larvae of beetles. The beetles my be Japanese beetles (do you have these?), June beetles. One can actually determine the specific beetle by examining the terminal segment (fancy name for butt!). Different beetles have different life cycles so knowing the species would be great for treatment.
Grubs are chewers and do damage by eating the turfgrass roots.
You would nit use a pesticide but an insecticide in July/August for the best effectiveness. But it the grubs may be resistant to the insecticide.
If you would like the best results you have to do a bit of detective work. A cook wet spring delays hatching whereas a warm spring advances the hatch. In a dry summer the eggs myay not hatch at all. Water a area of lawn where you would like to do the testing for best count of the grubs.
I know that you would like to use nematodes vs insecticides. They can be very effective if used according to package directions. But can be also a costly measure if you have a large area of turf to treat. Keeping your turf properly watered and having a vigorous root system will also prevent grubs from making an impact on your turf.
If you can, In Ontario province there is the University of Guelph? They may have literature you can use. Also Cornell University in New York has an excellent website for turf info (they have a former UW-Madison turf professor).
Otherwise I can probably track down more info if you need it!
Hi Gail, I was hoping you'd respond.
Yes, we've already done the investigating.... last year we were digging our backyard to do our deck and pour a concrete pad for the shed, so I uprooted a bunch of sod.... In that specific area I was getting 15 sq/ft in some spots, 10 in others. So I'm pretty certain they are starting to be problematic.
We do have an abundance of "June Bugs" for about a week. They are awful.... inside it literally sounds like a heavy rain as they ping off the upstairs window
We have a 40ft wide by bout 40-50ft to treat. We did our own sprinkler system, on timer as our soil is pretty sandy.... only a few inches of topsoil
(don't get me started on that one).
We do have the odd skunk, but our main problem based on the 2 neighbouring lawns was a mole (moles)..... omg the damage it did to their lawns over the winter is awful...... I can say 100% it was a mole (assumably digging for grubs) that tunneled through their yards. Our yard didn't get much damage but I blame that on the fact that we have a dog, whereas our 2 neighbours do not. The mole did some work in my veg garden, and a little bit of damage in the very back where my dog can't reach (she is on a clothesline type of run and can only go so far). The reason I know for sure what it was is that a few days ago my neighbour came and got us because she saw something in the yard, thought it was a mouse/rat or something (she's scared of vermin) so we went out and investigated.... it was this mole thing on its last legs... Today when cleaning the yard, we found its body.
Based on the damage to their lawns, the moles were finding alot of food.
The way I read the box is that you need to do 2 treatments of nematodes to solve the prob. One at the beginning of the season and one at the end of the season.... we bought a box for the beginning and could never catch a day that it wasn't sunny and the right temp.
My main reasons for not wanting to use an insecticide are: my snakes. I take my snakes into my yard, and that could kill them.... children, its a chemical, etc.
I like a good looking lawn/gardens/landscape so we're more than willing to invest some money into getting rid of the grubs, IF the nematodes work well that is. I don't know anyone personally who has used them....
Yes we do have the Guelph University, its ummm couple hours away from me. Definately any additional info you could give me would be appreciated. I'm doing my own investigating as well.....I guess ultimately, I want to find out if there's a good chance the nematodes would work, if we'd have to do that every year, etc. and then I'll start calling places. I have had a couple lawncare flyers delivered and they've stated they do have the nematodes but no mention of cost.