Category: Weed Control

    Star of Bethlehem and Spring Beauty are currently emerging and flowering in shaded areas in southern and central Indiana . Both plants have pretty white flowers with the Star of Bethlehem having six petals while Spring Beauty has...

With the above average temperatures over the last few weeks, many questions have arisen again about when to apply the preemergence herbicide for crabgrass. As mentioned in the February 20 edition of Turf Tips, it is much better to apply...

Prostrate knotweed is currently germinating in thin areas next to sidewalks, cart paths, driveways and other hotspots. Knotweed is often confused with crabgrass at this early stage. Knotweed leaves have rounded leaf tips whereas crabgrass has leaf tips that come...

I have received a number of calls recently about controlling quackgrass in turf. Quack is difficult to control because it spreads by deep rhizomes and herbicides do not translocate well through the rhizomes. The current best method is with 3-4...

If a preemergence herbicide is justified on your lawn to control crabgrass now, most of those are available combined with fertilizer and you are forced to apply a fertilizer now. Look for a product with low nitrogen and be sure...

There are many, many formulations and combinations of preemergence herbicides available for the professional. Following are some suggestions for purchasing and using preemergence herbicides. Control from every preemergence herbicide can vary from year to year, or location to location. Therefore,...

If a preemergence herbicide is justified on a turf area, the timing of application is important. In theory, applying too early will expose the herbicide to soil microbes and processes in the soil that may break it down, allowing crabgrass...

With the incessant rain and high winds, most applications of broadleaf herbicides have been delayed. The good news is its not too late to apply. Nebraska research reported in 2002 showed 2,4-D and/or dicamba were far more effective in controlling...

We found that herbicides applied from October 1 through November 1 improved long-term ground ivy control compared to the same herbicides applied in September. Our speculation is that weeds are killed either directly by the herbicide when applied later in...

Those dandelions, clover, and other broadleaf weeds that were a problem all summer should be controlled this fall. The period from late September through all of October is the ideal time to control broadleaf weeds in turfgrass because broadleaf weeds...

The tremendous crabgrass pressure mentioned in earlier Turf Tips deserves more attention and the most common question is “Why is it so bad this year?”. The obvious answer to this is the above average heat and humidity during July increased...

The recent heat may unfortunately favor early exit of Poa annua from golf turf. However, there is a silver lining to this. Rutgers reported that overseeding creeping bentgrass directly into a Poa stand in summer is effective for gradual conversion...

Persistent air tempertatures of 90F and soil temperatures greater than 80F combine with high humidity and adequate rainfall (in some areas) is doing in the Poa annua (annual bluegrass)and Poa trivialis (rough bluegrass)on golf courses. After a week or two...

Persistent air temperatures of 90F and soil temperatures greater than 80F combine with high humidity and adequate rainfall (in some areas) is also doing in the Poa annua (annual bluegrass) and Poa trivialis (rough bluegrass)on lawns and athletic fields. Patches...

The rain and 90F temperatures have boosted the growth of both crabgrass and yellow nutsedge in the last week or two. Unfortunately, our options for control of either weed are becoming limited. Plus the hot temperatures increase the risk for...

Fountain grass and other ornamental grasses have added tremendously to the urban landscape. However, we are now seeing some of these grasses escape from the ornamental beds into the turf. One in particular is fountain grass (Penisetum spp) because it...

Bermudagrass is one of the most difficult species to control due to its extensive stolon and rhizome system, aggressive growth, and tolerance to management and environmental extremes. It is even more difficult to control selectively in another warm season grass,...

In theory, a barrier of preemergene herbicide is created in the soil and limites emergence of crabgrass. Any gap in this barrier could allow crabgrass to germinate. This is why a uniform application of preemergence herbicide is required and practices...

April 15-20 usually marks the end of the window for applying traditional preemergence herbicides in central IN, a week earlier in southern IN, and a week later in northern IN. Though most preemergence herbicides do have minor post-emergence properties that...

Many turf areas did not get treated for broadleaf weeds last fall because of the dry fall combined with the fairly early snowfall. Though fall applications are most effective for controlling broadleaf weeds, spring applications are warranted for new lawns...