I do ok with my research on handling weeds, but this year the cloves and other vine type weeds are really giving me a headache. I am scared to put anything on the warm weather grass in its growing season. If you have any advice for treating a lawn in the summer for weeds, without too much kill off of the grass, I'm all ears!
Oh and I found the nutsedge works all through the hottest parts of our Huston summers and does no damage at all to the surrounding St Augustine. I tried to apply it a day or so after mowing so the chemicals have a full week to get down to the root patch under the soil and kill it all off.
I have had pretty good luck with the following formula in AZ. Whatever weed grows in the summer I view as something to kill the seeds rather than the plant itself. When the weather is cooler and the grass is established, I hit it with everything I can. In the late summer, I use a half-dose of 2,4-D with a half-dose of Dicamba as soon as the weather turns cool enough to treat the grass (under 95 in the day and under 80 at night). I spray the lawn at dusk, water at sunrise, then repeat the treatment in a week. If I don't get reasonable control, I repeat a third time about 2 weeks later. And, as soon as the winter grass is taking hold in the late fall, I treat with a good liquid pre-emergent. I repeat the pre-emergent in the early spring just as the weather starts to hit turbo-grow (around mid-March for us in Phoenix) but I use a granular combo "weed n feed" rather than the liquid - it seems to create less heat stress on the lawn. Using this system I have been able to control 95% of the weeds over the course of 2 years or so. It is a slower process but it works.
By knocking down the seeds in the spring and early fall I can keep the nutsedge and spurge to a minimum. Anything that starts to emerge in the winter grass I can knock down with Dicamba or 2,4-D. Using this method - kill the plants in the spring, fall, and winter and the seeds in the fall and spring - the first year was a little disappointing, but the following years have been great for weed control. Weed control also means seed control - kill it before it can seed, and make sure to kill the seeds as they germinate. Takes a while but I have turned my lawn from a disaster to the envy of the neighborhood in about 2 1/2 years.
I tend to attack the heck out of weeds during the winter since I do not over seed with rye or fescue. So whatever comes out of the ground, is a weed. I also use the spray and spreader type of pre-emergence. All I have to say is that Clover and Nutsedge are tough tough tough. Thank you for the tips and adding to my arsenal for weed control :)