Register free!


Reply
 
Thread Tools   Display Modes
  #1  
Old 05-09-2013, 05:49 PM
Yatt's Avatar
Yatt Yatt is offline
LawnSite Member
 
Join Date: Apr 2012
Location: Onalaska, WI
Posts: 100
Japanese beetle grubs

This week I had bare and dead spots in several clients lawns that I attributed to the drought last year. (these same areas had severe mole activity too)

When the Reinders rep brought me the balance of the fertilizer shipment I had him take a look and he attributed it to grubs from Japanese beetles. Up until recently these were never an issue.

He suggested a Merit based fertilizer to be applied in June. From what I understand you need to get them at the first instar stage.

So what everybody use, straight Merit (imadacloprid), fertilizer with Merit or can imadcloprid be added to a broad leaf treatment and sprayed at the same time?

Thanks
Reply With Quote
  #2  
Old 05-09-2013, 11:36 PM
RigglePLC's Avatar
RigglePLC RigglePLC is offline
LawnSite Fanatic
 
Join Date: Jul 2006
Location: Grand Rapids MI
Posts: 9,510
Cold where you are. I think about the first week of July is better.

HOWEVER, BE PROFESSIONAL--get your license; learn to recognize grubs for yourself. Dig up some dirt and find the grubs. Find out what moles actually eat.
You would be crazy to treat for grubs because he wanted to sell you a few thousand dollars of Merit.
More likely you are correct--drought damage.
Reply With Quote
  #3  
Old 05-10-2013, 01:07 AM
DA Quality Lawn & YS's Avatar
DA Quality Lawn & YS DA Quality Lawn & YS is offline
LawnSite Fanatic
 
Join Date: Sep 2007
Location: Rochester, MN
Posts: 8,037
Riggle is right, highly doubtful it is grubs this far north. Over my 6 years in biz, I have checked for grubs many times but never found any where I thought they may be. Hence, I have not once applied any grub treatment.
And you are as far north as we are.
__________________
7x14 Stealth SE Enclosed with 48" side ramp
08 Toro Z400 48" deck, 21HP Kaw with EZ Vac twin bag
09 Exmark Turf Tracer HP 36"
21" Toro SR4 Super Recycler
Stihl KM90 Kombi w/ straight shaft trimmer & tiller heads
Husqvarna 125B Blower
PG Magnum
Turfco XT5 Aerator
Turfco LS-22 Overseeder
EcoLawn 200 Applicator

I can do all things through Him who gives me strength.
Philippians 4:13
Reply With Quote
  #4  
Old 05-10-2013, 09:18 AM
Smallaxe Smallaxe is offline
LawnSite Fanatic
 
Join Date: May 2007
Location: Central Wisconsin
Posts: 9,946
I've seen June Bug grubs when ploughing up a pasture, but one could never notice it from above... I too have never seen grub damage to lawns... the only thing ever noticed was the skunks going through and ripping up the lawn to get at the grubs...

Junebugs must feed so deeply in the turf that their activities do not necessarily kill the turf above...
__________________
*
Now that I know that clay's texture(platelets) has nothing to do with water infiltration, percolation, or drainage
,,, I wonder what does...
*
Reply With Quote
  #5  
Old 05-10-2013, 10:56 AM
caseysmowing caseysmowing is online now
LawnSite Bronze Member
 
Join Date: Mar 2012
Location: Staunton VA
Posts: 1,552
I actually had my first lawn that had grin damage from what I could tell. I have had other lawns that skunks have torn up. Either way you would want to get rid of them. My lawn has them really bad along with moles. One day I'll have the money to get around to it and time.
Posted via Mobile Device
Reply With Quote
  #6  
Old 05-10-2013, 07:52 PM
Yatt's Avatar
Yatt Yatt is offline
LawnSite Member
 
Join Date: Apr 2012
Location: Onalaska, WI
Posts: 100
Quote:
Originally Posted by RigglePLC View Post
Cold where you are. I think about the first week of July is better.

HOWEVER, BE PROFESSIONAL--get your license; learn to recognize grubs for yourself. Dig up some dirt and find the grubs. Find out what moles actually eat.
You would be crazy to treat for grubs because he wanted to sell you a few thousand dollars of Merit.
More likely you are correct--drought damage.
I am licensced.

I am not about to just treat because a salesman suggested something. I intend to dig up some sod and see for myself. It has been extremely cold this year and things are way behind schedule. I have not even mowed my own yard yet.
Reply With Quote
  #7  
Old 05-10-2013, 08:18 PM
Yatt's Avatar
Yatt Yatt is offline
LawnSite Member
 
Join Date: Apr 2012
Location: Onalaska, WI
Posts: 100
Quote:
Originally Posted by DA Quality Lawn & YS View Post
Riggle is right, highly doubtful it is grubs this far north. Over my 6 years in biz, I have checked for grubs many times but never found any where I thought they may be. Hence, I have not once applied any grub treatment.
And you are as far north as we are.
Well the one client has japanese beetles traps out. Yes I understand that the pherones used probably draw more than they kill and exacerbate the situation. However he catches several gallons of them in the traps and the traps have to be emptied every couple day due to the bags being full.
So how many japanese beetles are in a gallon? I would say quite a few and that indicates a problem.

The area I service is semi rural with very large lawns surrounded by woods. From what I understand the japanese beetle life cycle centers around the adulsts laying 4-5 eggs at a time in the sod, the instar molts 3 times at which time it goes deep and comes out in the spring to start the process over. With density of the pest adults, they have to be in the sod and not in the woods where there are no grass roots to feed on.
Reply With Quote
  #8  
Old 05-10-2013, 09:12 PM
RigglePLC's Avatar
RigglePLC RigglePLC is offline
LawnSite Fanatic
 
Join Date: Jul 2006
Location: Grand Rapids MI
Posts: 9,510
Life cycle sounds about right. Around here, grubs feed for a short time in the spring. Then pupate. Emerge as adults. Mate. Lay eggs. New grubs emerge. Main damage occurs in October.
Japanese beetles emerge around June 15. Best time to treat, I have been told is about July 4th, --about when the eggs hatch. If using Acelepryn, treat a few days earlier as it is a bit slow to uptake--yet long lasting.
Reply With Quote
  #9  
Old 05-11-2013, 08:57 AM
Smallaxe Smallaxe is offline
LawnSite Fanatic
 
Join Date: May 2007
Location: Central Wisconsin
Posts: 9,946
I believe Riggle has it right as far as timing... I find it hard to believe that the grubs woke up under the snow and started eating roots a couple of weeks ago, already...
__________________
*
Now that I know that clay's texture(platelets) has nothing to do with water infiltration, percolation, or drainage
,,, I wonder what does...
*
Reply With Quote
  #10  
Old 05-11-2013, 09:12 AM
phasthound's Avatar
phasthound phasthound is offline
LawnSite Platinum Member
 
Join Date: Jan 2006
Location: Mt. Laurel, NJ
Posts: 4,076
Here's a pretty good article from UMass on IPM for grub control. http://extension.umass.edu/turf/mana...noids-and-bees
We all should be better educated in the over use of pesticides. Every applicator has a continual obligation to apply all pesticides in a responsible, informed, and careful manner.
__________________
Barry Draycott

The nation that destroys its soil destroys itself.
Franklin D. Roosevelt
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump





Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.comô - Moose River Media
All times are GMT -4. The time now is 03:58 AM.

Page generated in 0.07302 seconds with 9 queries