Two applications for crabgrass?

[capetrees]

I was noticing the other day that there seems to have been a new outbreak of crabgrass around where i live in MA. I noticed the same last year, in lawns that have been fertilized with crabgrass preventer in the spring. When discussing this with someone from Pennsylvania, she mentioned her lawn is treated twice a year for crabgrass, once in the spring and then again in the mid summer. Is this a new idea? I have no crabgrass in my lawn but notice it in a few that I cut weekly. Is it ok to treat a lawn more than once a year with crabgrass preventer and should I begin doing this with my own lawn? Again, I don't have any but I wonder if it really means "yet".:confused:

[tlg]

The summer crabgrass application is most likely a post-emergent application. Not a pre-emergent applied in the spring. Pre-emergent applications can fail for a variety of reasons and the need to kill crabgrass once it has emerged requires a post emergent for control.

[Hissing Cobra]

Yes, you can do two applications. In fact, I recommend it. I've been doing this on the lawns that I take care of for the past 4 seasons and I don't have any crabgrass issues whatsoever.

I do my first one on April 15th and the 2nd one on May 27th. The crabgrass control will generally last about 90 days and not the 120 that the labels usually state. That being said, if your first one is applied on April 15th, it'll last until July 15th or so. By reapplying it on May 27th, that one will last until August 27th but more importantly, double your protection from May 27th to July 15th.

I live in Mass too, so those dates are good for this area. My program is shown below.

April 15th - 19-0-6 Fertilizer (30% slow release) + Dimension Crabgrass Pre-emergent Crabgrass control

May 27th - 19-0-6 Fertilizer (30% slow release) + Dimension Crabgrass Pre-emergent Crabgrass control

July 8th - 24-0-8 Fertilizer (40% slow release) + Merit Grub Preventative product

August 19th - 28-5-12 Fertilizer (50% slow release) + 3% Iron

September 30th - 21-3-21 Fertilizer (75% slow release) + 1.5% Iron

Anytime - Dolomitic Limestone applied at a rate of 50#'s per 1,000 sq. ft.

For weeds, I keep a gallon of Eliminate - D on hand and mix up a gallon for spot treatment purposes when they need to be done.

[TJLANDS]

Cobra
""September 30th - 21-3-21 Fertilizer (75% slow release) + 1.5% Iron""

Wow, how much and where do you get it from. That bag would be pushing $50 here.

[humble1]

I was noticing the other day that there seems to have been a new outbreak of crabgrass around where i live in MA. I noticed the same last year, in lawns that have been fertilized with crabgrass preventer in the spring. When discussing this with someone from Pennsylvania, she mentioned her lawn is treated twice a year for crabgrass, once in the spring and then again in the mid summer. Is this a new idea? I have no crabgrass in my lawn but notice it in a few that I cut weekly. Is it ok to treat a lawn more than once a year with crabgrass preventer and should I begin doing this with my own lawn? Again, I don't have any but I wonder if it really means "yet".:confused:

I do two on bad lawn, this year the barrier got pushed down because of the 16 inches of rain end of July. Even w/ 2 apps i still got crab.

[shovelracer]

Sorry thoughts I was posting a new thread

[Soupx5]

I would recommend 2 apps. Depending on heat (soil temp) and rainfall pre-emergents only last 60-120 days, also depends on the active ingredient. Pendimethalin roughly 60 days, Oryzalin 90-120 and Prodiamine 90-120. It also depends on the rate. Each one should have a one time app and a split app rate.
If you make an app and it rains excessively or if you make the app and have a drought and the customer does't water it in.then you have a back up app coming in about 2 months.
Crabgrass typically doesn't germinate till soil temps reach approx 55. You need to have that first app out and watered in just prior to the 55 degree mark.

[bx24]

I guess I am the odd ball. I do a split app in the spring of Pre-M 3.3 and Dim EC. Then in the later summer/early fall I use Dim/Pre or Prograss for crab or POA.