Pre emergent (Prodiamine 65 WDG) application rate
Hello,
Thank you for all the previous help here on the forum. I have learned a lot and my grass looks great. I had planted the grass in September 2015 in Long Island and the weather is getting warm again. I believe that now is the time to spray because I see the forsythias starting to bloom.
I have Prodiamine 65 WDG. I have a 5 gallon tank mixer that is inline with the main lawn sprinkler pipe. The way it works is the tank is filled with 5 gallons of whatever mixture. The specs on the tank says that 1000 gallons need to be ran through to completely empty the mixture. I am going to adjust the time on my lawn sprinklers as well so that by the time all the zones have cycled once, it will have ran 1000 gallons through the mixing tank so it matches. This way I know the lawn was covered properly with the mixture and used all of it up. So that part I have squared away. My problem is that I want to make sure I am reading the application chart correctly on the Prodiamine bottle.
Attached is what I believe to be the application rate chart. If I am reading this correctly, it is telling me that I can apply 1LB of this stuff to 1 acre. I have a 1/2 acre so obviously that would be 1/2 LB.
1) Am I reading this correctly?
2) If so, how do I weigh a pound of this stuff? How much of this equals a pound if I have a 1/4 cup scooper?
3) Can I add 1/2LB of this stuff to the 5 gallon tank and run the lawn sprinklers once to just get it done? Or should I dilute by dividing the 1/2LB by four and add each 1/4 to the five gallon mixer on four separate occasions on four different days within the same week(to avoid possible burning)? Or maybe diluting twice instead of 4 times? IDK
4) Whatever the answer is to #3, the application chart says 1/2LB per 1/2 acre per calendar year, so I would like to do this once at this time of year every year. Is this ok?
Also attached is the type of grass I have.
I know this stuff isn't usually applied through lawn sprinklers but I am going to give it a shot.
Comments (9)
beckyinrichmond
8 years agodmt4641
8 years agolast modified: 8 years agoRelated Discussions
Need Pre-emergent suggestions
Comments (20)I'm also just starting to put forth some effort in learning about lawn care. This will be my first time using a pre emergent. From everything I've read, this is the perfect time to put it down for the Fall. So I went to a big box store in San Antonio and the only pre em they carried was Vigoro Crabgrass & Weed Preventer (Dithiopyr). I tried to find some Dimension or Prodiamine like you guys recommended, but that's all they had and I wanted to get something down this weekend. I do have a crabgrass problem, so I guess it can't hurt. I have a few questions: 1. The instructions said to only use it once a year, but the label also said it only protects for 4 months. I was planning to use it again in the Sping, but don't want to cause any damage. How does that work? Can I use it again, or should I use something else? 2. Speaking of using something else, would it hurt anything if I was able to find some Dimension or Prodiamine and put that down this week? Or would that be too much at once? Thanks for any feedback!...See Morepre emergent (Lesco Stonewall 0-0-7) question
Comments (12)I'll give my 2 cents since I have bermuda and this is the exact pre-emergent I use. I did the calculations in the past as I believe the bag rate is in annual applications per acre and I thought it was closer to 12.9 lbs/1000 sq. ft. I could be wrong. Either way, I think your logic is right. I have read to do split applications of stonewall. So for the sake of making the math easy, we'll use your number round down to 16 lbs/1000 sq ft and divide by 4. You want 4 applications at 4lbs/1000 sq. ft. You'll want to do one in the spring and the 2nd app about 8-10 weeks later. Same thing in the fall. As you somewhat hinted at, the goal is to make sure any weed that germinates later then expected will be caught by the 2nd application. I don't put down anything in the summer months as my grass is thick enough and I really don't have to worry about weeds. As long as you don't over apply or spill it, it will not kill your grass. I spilled some near my fence a few years ago and even though I cleaned it up as best as I could, nothing has grown back since then. 8.5 lbs for one application sounds like too much so I would discourage that. Lastly, this product has worked well with grassy weeds but not so well with broadleaf weeds. I have zero crabgrass or poa and I had some horrible poa a few years back. I spot spray the broadleaf weeds and my lawn looks fantastic. Hope this helps....See MoreNeed advice for pre-emergent zone (7a)
Comments (12)I have a Hustler X-One zero turn and that's what I use to pull mine. With a ZTR it is easy to turn too sharp and jack knife it so you just have to be careful there. Otherwise it's really easy once you get used to it. While using the pull behind you will be going pretty slow anyway. There's an on/off switch on the power wire that connects to the battery. I zip tie that to the roll bar so it's easily accessible and you can turn the pump on and off as needed.. You may find a spot that works better for you. Again, practice with plain water until you feel comfortable with it. 1- I prefer to get mine down a little early if possible. I can't remember the exact numbers but I plan mine to run out about August. The label lists the different rates and how long it will typically last. Just plan accordingly so it will run out just prior to seeding. 2- If you are overseeding then no, DO NOT put out prodiamine. 3- Read the label to double check but I believe it's either 60 days or after the new grass has been cut 4 times. Again, don't take my word on this because I'm going off of memory. 4- I do a pre-m every year. Around here we get a lot of rain during the spring when temps are ideal for weed seeds to germinate. Last year spring came way early and I didn't get my pre-m down and weeds were a problem. This year I got it down mid February and weeds so far have not been an issue. I wish a fall app would work for me but having to overseed every fall kills that. My main problem is winter annuals like chickweed and henbit but spot spraying those is pretty easy and has worked for me....See MoreDimension 2EW versus Prodiamine 65 DWG
Comments (4)That is correct, the amount of carrier you dissolve the product in does not matter, except in that you want to have enough carrier to cover the entire area. What matters is the amount of product per 1000 sq ft. So if your application rate is 0.75 oz per thousand, you can dissolve that in one gallon of water and apply the whole gallon over 1000 sq ft or you can dissolve it in 5 gallons of water and apply the whole 5 gallons over 1000 sq ft. In both situations you got 0.75 oz of product per thousand. So the ratio of product to carrier doesn't matter. They do give a minimum amount as a general guide of what they feel would be needed to get decent coverage, but it's up to you and your equipment. I'll give you an example - it takes me 4 gallons of water walking at about 4 mph with a sprayer that puts out 0.8 gpm to cover a 2,000 sq foot area. If you came over and walked at the same pace with a sprayer that only puts out 0.4 gpm, you would cover the entire area with only 2 gallons of water. You can imagine, if you change walking speed that impacts it too, so if you walked at half the speed you'd also end up using 4 gallons. So, I would dissolve my 1.5oz of prodiamine in 4 gallons of water, you would dissolve it in 2 gallons of water, and we would both end up applying the same amount of product but in different amounts of water due to the sprayer difference. The easiest way to do it - this is called "calibration" - is to spray the area at a comfortable pace with plain water. See how much water it took. This is the amount of water you will want to dissolve your prodiamine in....See Moretye22tye
8 years agobeckyinrichmond
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