You Are Here: Management Updates 2009 Archive April 28, 2009

Date: April 28, 2009
Category: Weeds
Subject: Preemergence Annual Grass Control, Broadleaf Weeds

Preemergence herbicides for crabgrass and other annual grasses should be in full swing.  If split applications are used in your crabgrass control program, apply 50% of your active ingredient now.

The very warm weather has pushed dandelions to flower but it is still too early for broadleaf herbicide applications. If broadleaf winter annual weeds are problematic at this point they can be treated.  Broadleaf winter annuals can be of concern in turf areas that where established late fall.

Common winter annual weeds in turf (visit http://www.umassextensionweedherbarium.org for pictures and identification information):

• mouse-ear cress - Arabidopsis thaliana
• thymeleaf sandwort - Arenaria serpyllifolia
• downy brome - Bromus tectorum
• shepherd's-purse - Capsella bursa-pastoris
• bittercress - Cardamine hirsuta
• sticky chickweed - Cerastium viscosum
• horseweed - Conyza canadensis
• spring whitlowgrass - Draba verna
• henbit - Lamium amplexicaule
• red deadnettle - Lamium purpureum
• field pepperweed - Lepidium campestre
• virginia pepperweed - Lepidium virginicum
• pineappleweed - Matricaria matricariodes
• annual bluegrass - Poa annua
• knawel - Scleranthus annuus
• common chickweed - Stellaria media
• field pennycress - Thlaspi arvense
• corn speedwell - Veronica arvense
• purslane speedwell - Veronica peregrina

Finally, tree seedlings in turf will mow out, an herbicide application is not needed.

Submitted by: Randall Prostak

DISCLAIMER - As always, it is the responsibility of the applicator to verify the registration status of any pesticide BEFORE applying it. Different states have different regulations as well. The author and the University of Massachusetts are not liable for any consequences of any pesticide "recommendations". Mention of any trade name is not to be considered endorsement of a product.

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