The Purdue Plant and Pest Diagnostic Laboratory

What's Hot on April 18, 2006
at the P&PDL!

Spring Dandelion Control Still Not as Effective as Fall Control

Zac Reicher, Professor/Turfgrass Extension Specialist, Department of Agronomy, Purdue University

The annual bloom of dandelions is already here in southern and central Indiana. This marks the beginning of the second most effective period for controlling broadleaf weeds. The optimum time to control dandelions and other broadleaf weeds is in the fall and the second most effective time is in late spring, at or shortly after the flush of flowers. Herbicides containing the traditional active ingredients 2,4-D, MCPP and dicamba are effective for control of dandelions and other broadleaf weeds. However, newer active ingredients like carfentrazone, triclopyr, fluroxpyr, and sulfentrazone can increase the speed of burn down,, spectrum of weeds controlled, and overall effectiveness depending on the product used. If only a few dandelions are present in the turf, consider spot-applying a herbicide rather than treating the whole lawn. It’s ineffective to use more herbicides than what is necessary on turf. Be extremely careful when applying any herbicides near ornamentals because they can be easily damaged by these herbicides. For more information, refer to AY-9, "Broadleaf Weed Control".

Photo courtesy of Glenn Hardebeck

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Information listed is valid only for the state of Indiana


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Dandelions in field

Purdue Plant & Pest Diagnostic Lab Purdue Cooperative Extension Service