View Full Version : merit didn' work
10-18-2000, 07:45 AM
we have lawns loaded with grubs, the merit just did not work this year. did anyone else have this problem. we used merit 2 years ago and got excellent control.
10-18-2000, 08:27 AM
Down here along the coast (CT), no problems so far. I think you are local, so I would assume it was all watered in, because of the rain we had all season. We put ours down a little bit later - 3rd application, after 2 pre-emergents, so it was going down while the grass was really growing well. Did you put it down too early, or during that short hot/dry spell we had early in the season?
I have had lawns treated with merit sandwiched between bad lawns with nasty infestations. For the last few years its been like there is an invisible fence.
10-18-2000, 10:31 AM
Have not had a problem for four years of Merit useage out here. What formulation did you use, and what was the timing of applications?
10-20-2000, 07:35 PM
we used the wsp and sprayed in may and june .will try mach 2 next year.
10-20-2000, 08:12 PM
I use MachII, but a customer put down GrubX (Merit) and had some damage, not severe, but there none the less.
Another customer has one of the larger Co's in the area treat his lawn. I have been trying to get him for years. I stopped to cut one afternoon, and the tech was there. I asked what he was applying, he replied" grub control". I didn't get anything further from him.
Well, this lawn suffered big time. The critters are a diggin'. If I can't sell him after this, I never will be able to.
10-20-2000, 09:54 PM
Steven, I would check that all problem properties were not in the same batch of spray. Can always have a mixing error. If you are sure of calibrations, I would check with the Bayer rep for your area.
When I have had problems with chemicals in the past, I found the manufacturer reps to be the best source of resolution. It is often a simple answer that you never think of.
10-22-2000, 08:06 PM
Steven, An important factor in successful grub control is application timing,rate and pest being controlled. If Merit
is applied to early there will be not enough residue for effictive control. Bayer is recommending applying Merit at the highest rate. Merit should be watered in very soon after
the initial application v/s Mach 2. Was the grubs found checked to see what grub it was? If the grub was a masked
cheafer you may have missed the window. I've used Merit for the 5 years or so and have had excellent results. No plans
on changing products any time soon. By the way I use granular fertilizer w/ Merit.
10-28-2000, 01:49 AM
Jaclawn, you said that a customer used some GrubX. The formulation of that product changed this year in my part of the country (midwest). It used to be the same active as merit but now is that same as MachII. I noticed this at the hardware store one day. I use merit and machII on a rotating basis now. Half my yards get merit one year mach II the next, the reverse next year. I say kill'em all let god sort them out
steve,i came across your post in a search. what are you doing this year with the grub problem?
05-17-2001, 11:26 PM
There have been numerous studies done on Merit with no indication of any resistance.
Generally spreader ( sprayer ) calibration is to blame for ineffective control. The other possibility is that you received a bad batch, no merit in the substrate.
05-27-2001, 01:19 PM
regarding the merit. the grubs merit did not control were the oriental not the jap grubs. to contol them we had to increase the rate from 1 poch per 12m to 1 pouch to 9m. this should work. we are aplling it now in round 2.
05-27-2001, 04:44 PM
Thats odd, because on my label Merit lists the same rate for both Jap and Oriental Beetles. The more mature the grub the higer the rate, within the labled range. Did you use the low rate for mature grubs?
Also rember Merit is systemic, and therefore the effect of the second application will be cumulative with the first.
06-07-2001, 07:49 PM
YEAH, THERE ARE A LOT OF VARIABLES. WATERING IT
IN IS A BIG ONE. THOSE BAGS SHOULD BE SEALED AIR
TIGHT BECAUSE THE PRODUCT WILL BEGIN TO BREAK
DOWN AS SOON AS OXYGEN HITS IT. IF IT SITS FOR
2 DAYS BEFORE GETTING RAIN, YOU COULD LOSE SIGNI-
FICANT POTENCY OF THE ACTIVE INGREDIENT.I WOULD
LIKE TO SEE A MANUFACTURER NOTE ON THE LABEL ABOUT
THESE PRODUCTS. I DO MY GRUB APPS IN A LIGHT SPRINKLE
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