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Dennis from Glenwood, Ia writes

I am trying to control crabgrass in Iowa. What should the ground temp be in spring to apply Dimension 2W?

Answer:

Crabgrass seeds begin to germinate when soil temperatures reach 55 to 60 F and continue to germinate over several weeks from spring into summer. Pre-emergent herbicides such as Dimension 2EW normally should be applied in early to mid-April in southern Iowa, mid-April to May 1 in central Iowa and late April to early May in the northern portion of the state.  Pre-emergent herbicides should be applied when the forsythia blossoms start dropping or when redbud trees begin to bloom.  I found a great article here by Iowa State that further explains.

Answer last updated on: 01/31/2017

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Dimension 2EW Herbicide

Dimension 2EW Herbicide

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