Diquat Aquatic Herbicide to Control Bluegrass, Duckweed, Hydrilla & More - Glyphosate Alternative, Fast-Acting Non-Selective Liquid Weed Killer for Aquatic & Landscape Use - 2.5 Gallon

This stuff is amazing. I have a lake in my backyard and every spring It starts to grow aquatic weeds. Also with the rains in April and May, it makes the water just kind of cloudy and yuck so I mix up a batch of this and it kills the aquatic leaves, but it’s safe for the fish. I also discovered that this stuff is lethal for any sort of regular weed. I was using regular weed killer and it would take a week or so to actually kill the weeds but never really just knock them out. So when I have extra of this stuff from the Lake. I put it on any weed that I want to annihilate. It kills them within an hour or so. I like that because they stay dead. They do not come back from this stuff. It is a little expensive to use as a total weed killer and you do need to have a soap or something so that it adheres to the weeds and you add it in your mixture when you’re using this... You use water, this stuff and I forget the name of what the soap thing is supposed to be called and you mix those three things together and you have your mixture. I get two batches out of each of these bottles. That requires two bottles of the soap stuff. I mix those in a sprayer and I’m good to go! This is good stuff!

I started using diquat in 2023 my 1 acre pond was 100% covered with duckweed and coon weed coming from the bottom I started treating it in June the results were visible within 2 days my pond has trees on all 4 sides so after reading everything I could find on duckweed I knew this was going to be a long process I would treat my pond every two weeks and since there are no fish I more or less sterilized it by fall it was 95% clear of duckweed and coon weed but since duckweed sinks to the bottom in the winter I knew that some would come back and in 2024 it did but only a small amount I sprayed it in May 2024 in killed most of it but I will tell you no matter what the experts say if your pond has trees around it is the leaves that fall in your pond is where duckweed gets what it get what it needs to grow I'm not sure if you can completely kill it 100% but I have a clear pond now but after going through what I did it was worth the time and money to get a beautiful pond back I had used several different types of products but with duck weed don't waste your money on anything but diquat they do make a product that will clear up the muck on the bottom but it is extremely expensive and has to be used yearly and new leaves fall in every year I decided diquat was my best option.

I've been using this chemical to control lake weeks for about 10 years. Here is what I've learned. This company (Lawn & Pest Control Supply) packs the product properly - with a tape seal and plastic bag - so that it can be easily unpacked. Do not purchase from NuFarm, they glue the lids closed with sealant so that the lids are impossible to remove without making a mess. Safety - this is super concentrated - wear gloves and SAFETY GLASSES - do not get it on your skin. I always pressure/leak test my spray rig before adding this chemical. Lake application - We use this to control underwater weeds in about 25 acres of a 40 acre lake. For preventative maintenance we apply a gallon every 3 (water temperature 85+) to 5 weeks (water temperature 55 to 65) using a 25 gallon sprayer to inject 3' below the water (in the sunlight zone). Never use more than 2 gallons (don't treat your entire lake at once!) because all the weeds will die and float making a big mess and killing your fish when the weeds decompose (taking all the oxygen from the water). I dilute 20 gallons of water to 1 gallon of water, injected at 4 gpm (2 down tubes) driving the boat at idle and holding a beer in the hand does the trick. Weeds need to be green/actively growing and in the sunlight zone (about 3' below the water) for this to work. Adding a gallon of copper improves the efficacy and makes the water more clear, although this year I am experimenting with coarse copper granules sprinkled in the root zones which seems to retard growth pretty well but does not kill unless applied at about a pound per 5 square feet. Do not apply below 50 degree water temp, the weeds must be growing and get sunlight for this product to work. Maximum efficacy by applying with at least 4 hours of sunlight after application and do not stir up the mud or all the chemical will bind with the mud instead of the leaves. Our lake is spring fed so it would be too expensive to dye. Using the diquat/copper combination we are able to keep the weeds under control and also maintain a healthy habitat. I also add a little bit of blue pond dye to help me see where I have applied. TIP - make sure to rinse your spray equipment with lots of clear water after use, this chemical is highly corrosive. Also it does stain fiberglass and carpet. I have also tried this chemical for killing weeds and grass at my house, at ~2oz per quart and it killed everything. Again be sure to spray when sun is forecast, this chemical works by interrupting the photosynthesis.

A proper mixture of Glyphosate and this Diquat results in a potentially powerful combination for many types of undesirable plants. I learned about this deadly mixture after studying Roundup QuikPro. The Diquat provides quick knockdown to prevent further growth and the generic Glyphosate slowly works its way down to kill the root. I find this particularly effective when dealing with thistles that have already grown and are starting to produce seed heads. Buying in the gallon size brought the per-ounce price to a reasonable level. The reason for knocking off one star is what happened in transport. This is a potent bit of hazardous material that should be shipped properly. The container was sent via USPS, which is famous for its abuse of packages. The foil seal on the mouth of the container had failed and the product was leaking into the cardboard box. Feedback was given to Amazon to relay the notice to the seller. There should be a sturdy plastic leak-proof over-wrap around the gallon container (this was lacking) and much better packing material inside the cardboard box (that part was not at all satisfactory. But other than the leak problem, the product is effective and it may be a good idea to stock up before the EPA finds out just how effective it is.

We had some weeds growing in our lake (under water) that copper sulfate would not kill. A little of this mixed in a spray took care of it, I was very impressed. I also tried it on other (above water) weeds and it also worked very well.