Product Q&A

Answer:

How long your pre-emergent herbicide such as Isoxaben 75 WG lasts can certainly vary with rainfall, but if you are using the recommended label rates the you should get weeks to months of control from your applications. Dandelions are a tricky plant to control since the plants can overwinter and last several years. It is recommended to apply Isoxaben in the fall for dandelions, then using a post-emergent called Defendor in the fall as needed and also in early spring prevents remaining plants from growing.  Dandelion also starts to germinate with soil temperatures as low as 50 degrees and much more as temperatures rise up to about 77 degrees, so your pre-emergent has to be down before these temperatures to be effective. Dandelion also thrives in thin turf in moist areas, so taking care of your desirable turfgrass will really help to prevent these weeds from competing.

Answer last updated on: 08/22/2019

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