Posts tagged ‘dandelion control’

Dandelion Control for Agricultural and Residential Applications — Fall is Best

Massive fields of yellow can be seen in farm fields, residential lawns, and many other areas thanks to the dandelion.  The April 23, 2009 BYGL had a great article on dandelion control.  The kneejerk reaction is to spray those dandelions now with herbicides, but control of dandelion this time of year is difficult whether dandelion is in an agricultural field or a residential lawn. Below are the dandelion control tips from BYGL:

Dandelions are more effectively controlled in the spring when they are in puffball stage. But remember, the best time to control dandelions is fall. However, areas with massive populations of dandelions need to be tackled now to reduce the amount of seeds produced, and to reduce the competition of the dandelions with the turfgrass. This action requires a second application of broadleaf herbicides later in the spring/early summer, if other weeds are present.

Herbicides containing 2,4-D, MCPP and dicamba are most effective for control of dandelions and other broadleaf weeds in turf and crops. If you only have a few dandelions in your lawn, consider spot-applying a herbicide with a spray bottle rather than treating the whole lawn. Pay close attention to the herbicide label and use the correct herbicide rate: more is not better.  Also, be sure to pay attention to the weather as to avoid applying a herbicide immediately before a rain event.

In addition to, or in place of, herbicides there are some things that can be done to prevent or reduce dandelion competition on your lawn.  First, mow at three inches and mow frequently so as not removing more than 1/3 of the leaf during one mowing. Also, a dense lawn is less prone to weeds so plan on fertilizing your lawn. In the Midwest, a general recommendation is two pounds of nitrogen per 1000 sq. ft. of lawn per year. The application of fertilizer should be split with one application in early-September and one application near the last mowing.

In summary, the best time to control dandelion is during the fall, regardless of whether the situation is in a lawn or in a crop field.  For turf, if dandelions are numerous to the point of choking grass then plan on two applications (one now and one in late-May) of broadleaf herbicides for control.

Full podcast available here:


April 29, 2009 at 7:30 am

Fall Maintenance of Turfgrass

Dr. John Street, OSU Turf Researcher, wrote an excellent article in the Buckeye Turf notes recently on fall fertilization of turfgrass:

The late-season fertilization strategy is based on applying nitrogen (N) fertilizer in the late fall (mid November to early December period depending on temperature). Ideally, N should be applied just around the time that top growth has significantly stopped or ceased. N applied at this time should extend the greening of the turf longer into the late fall without additional top growth, so timing is critical. Not too early but not too late.

The extended greening results in the turf remaining photosynthetically active for as much as 4-6 weeks longer. The carbohydrate from this still active photosynthesis is translocated downward to support root growth and stolon/rhizome growth or the excess stored as a food reserve for next spring/summer. Spring green-up is usually enhanced resulting in earlier spring greening and additional photosynthesis and food production without the surge growth from a traditional early spring fertilization. REMEMBER – This usually eliminates the need for N fertilization early in the spring where appropriate late fall fertilization has occurred.

Using a less costly water-soluble source containing a fair portion of urea should help offset or lower the fertilization cost. In fact, the majority of late season fertilization research was done with urea and ammonium nitrate. One pound of N per 1,000 sq. ft. is considered an acceptable rate. Urea alone can be considered. A premium late-season fert on sandy soils could include the addition of IBDU in a Urea/IBDU combination of 35-50% IBDU to lessen potential N leaching losses over the winter. IBDU is relatively temperature independent in N release.

In addition to fall fertilization, consider applying herbicides to your turf if dandelion or other broadleaf weeds are a problem. Early November is not too late to apply, so long as your turf and weeds remain actively growing.

Full podcast on this topic available here:

October 29, 2008 at 7:00 am

Weed Control in Winter Wheat – Fall is the BEST Time

Mark Loux, Ohio State University Weed Specialist, wrote an excellent article in the CORN Newsletter on weed control in winter wheat.  I encourage you to read the entire article, but I’ll give you Dr. Loux’s summary points:

  • apply glyphosate at 0.75 lb active ingredient/acre prior to planting wheat or immediately after wheat is planted
  • if timing/manpower does not allow for applying glyphosate prior to wheat emergence, plan for a early- to mid-November application of herbicide in emerged wheat (best: Express at 0.33 oz/acre plus dicamba at 4 oz product/acre)
  • fall herbicide applications in wheat are more effective than spring applications of herbicide in winter wheat

Listen to an excerpted version of the article in my podcast below

October 1, 2008 at 7:00 am


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