Turf Grass Weed Identification and Control
Turf Grass Weed Identification and Control - Collin
Turf Grass Weed Identification and Control - Collin
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<strong>Turf</strong> <strong>Grass</strong> <strong>Weed</strong> <strong>Identification</strong><br />
<strong>and</strong> <strong>Control</strong><br />
Dr. Jim McAfee<br />
Extension Specialist
<strong>Weed</strong>=Definition<br />
Undesired Plant<br />
Unwanted Plant
Types of <strong>Weed</strong>s<br />
› Broadleaf <strong>Weed</strong>s<br />
› <strong>Grass</strong>y <strong>Weed</strong>s<br />
› Sedges
Monocots-<strong>Grass</strong>es<br />
hollow stem<br />
parallel veins in<br />
leaves<br />
flowers<br />
nondescript
Dicot-Broadleaf<br />
round stem<br />
pithy material inside<br />
stem<br />
showy flower
Sedges<br />
Triangular stems<br />
Not a grass
Life Cycles<br />
› Annuals<br />
• Summer<br />
• Winter<br />
› Biennials<br />
› Perennials<br />
• Summer<br />
• Winter
<strong>Weed</strong> Potential
pre<br />
no pre
DNA Herbicides – Root Injury
Preemergent <strong>Weed</strong> <strong>Control</strong><br />
Timing of application is critical<br />
Water application in thoroghly<br />
Don’t disturb herbicide barrier
Postemergent <strong>Weed</strong> <strong>Control</strong><br />
Young, actively growing weeds<br />
Climatic conditions<br />
Low volume of spray application<br />
Addition of a surfactant helps
Biological <strong>Weed</strong> <strong>Control</strong><br />
Corn Gluten Meal<br />
• Does provide preemergent control<br />
• Expensive compared to conventional<br />
preemergent herbicides<br />
• Also provides some nitrogen
Corn Gluten Meal Trial 2005 -- Crabgrass,<br />
Barnyardgrass <strong>Control</strong>-Havlak, Richter<br />
Percent <strong>Control</strong> (35 DAT)<br />
(Treatment) (Crabgrass) (Barnyardgrass)<br />
<strong>Control</strong> 0 b 0 b<br />
Pendamethalin (1.71%) 70 a 73.3 a<br />
Corn Gluten Meal (1X)* 6.7 b 16.7 b<br />
Corn Gluten Meal (2X) 0 b 6.67 b<br />
Corn Gluten Meal (3X) 5 b 5 b<br />
*Corn Gluten Meal @ 20#/1000 sq.ft. = 1X rate
Crabgrass<br />
• Summer annual<br />
• <strong>Grass</strong>y weed
Crabgrass
Crabgrass <strong>Control</strong><br />
Preemergent <strong>Control</strong>s:<br />
apply before soil temperatures reach 55 F<br />
split applications may increase length of control<br />
dithiopyr, pendimethalin, oryzalin, benefin + oryzalin,<br />
benefin + trifluralin, corn gluten meal<br />
Postemergent <strong>Control</strong>s:<br />
MSMA
Dallisgrass<br />
Summer perennial<br />
<strong>Grass</strong>y weed
Dallisgrass
Dallisgrass <strong>Control</strong>l<br />
no preemergent controls<br />
msma<br />
• repeat applications, 7 to 10 days<br />
• don’t water or mow for 24 to 48 hrs.
Annual Bluegrass<br />
(Poa annua)<br />
Winter annual<br />
<strong>Grass</strong>y <strong>Weed</strong>
Annual bluegrass control<br />
Preemergent <strong>Control</strong>s:<br />
timing is very critical<br />
dithiopyr, oryzalin, benefin + oryzalin,<br />
benefin + trifluralin<br />
Postemergent <strong>Control</strong>s:<br />
glyphosate
Rescuegrass
Rescuegrass <strong>Control</strong>s<br />
Preemergent controls:<br />
early fall applications, before germination<br />
dithopyr, oryzalin, benefin + oryzalin,<br />
benefin + trifluralin<br />
Postemergent controls:<br />
• glyphosate
Field S<strong>and</strong>bur<br />
Summer annual<br />
<strong>Grass</strong>y <strong>Weed</strong>
Field S<strong>and</strong>burs <strong>Control</strong><br />
good cultural practices a must<br />
preemergent herbicides:<br />
• may take more than one application<br />
• dithopyr, pendimethalin, benefin + oryzalin,<br />
benefin + trifluralin<br />
postemergent controls:<br />
• msma
Nutsedge<br />
Purple nutsedge<br />
Yellow nutsedge<br />
Green Kyllinga<br />
Globe sedge
Purple Nutsedge
Yellow nutsedge
Globe Sedge
Tubers
Nutsedge <strong>Control</strong><br />
imazaquin<br />
halosulfuron<br />
MSMA
Henbit<br />
Winter annual<br />
Broadleaf <strong>Weed</strong>
Henbit <strong>Control</strong>s<br />
Preemergent controls:<br />
isoxaben<br />
Postemergent controls:<br />
for best control, treat in the fall<br />
2,4-D, MCPP, dicamba<br />
mcpp, 2,4-D, dicamba<br />
2,4-D, mcpp, dicamba, carfentrazone<br />
2,4-D, mcpp, dicamba, sulfentrazone
Carolina Geranium<br />
Winter annual<br />
Broadleaf weed
Carolina Geranium <strong>Control</strong>s<br />
Preemergent controls:<br />
same as henbit<br />
Postemergent controls:<br />
same as henbit
Common Chickweed<br />
Winter annual<br />
Broadleaf <strong>Weed</strong>
Common Chickweed <strong>Control</strong>s<br />
Preemergent controls:<br />
same as henbit<br />
Postemergent controls:<br />
same as henbit
D<strong>and</strong>elion<br />
Winter perennial<br />
Broadleaf weed
D<strong>and</strong>elion <strong>Control</strong>s<br />
Preemergent controls:<br />
none<br />
Postemergent controls:<br />
fall treatment works best<br />
2,4-D very effective<br />
2,4-D, mcpp, dicamba<br />
2,4-D, mcpp, dicamba, carfentrazone<br />
2,4-D, mcpp, dicamba, sulfentrazone
Spotted Spurge<br />
Summer annual<br />
Broadleaf weed
Spotted Spurge <strong>Control</strong>s<br />
Preemergent controls:<br />
isoxaben<br />
Postemergent controls:<br />
2,4-D, mcpp, dicamba, carfentrazone<br />
2,4-D, mcpp, dicamba, sulfentrazone
Oxalis<br />
(Yellow Woodsorrel)<br />
Winter perennial<br />
Broadleaf weed
Oxalis <strong>Control</strong>s<br />
Preemergent controls:<br />
same as spurge<br />
Postemergent controls:<br />
same as spurge
Virginia Buttonweed<br />
Summer perennial<br />
Broadleaf weed
Virginia Buttonweed <strong>Control</strong><br />
Preemergent controls:<br />
none<br />
Postemergent controls:<br />
same as spurge
White Clover<br />
Winter perennial<br />
Broadleaf weed
White Clover <strong>Control</strong>s<br />
Preemergent controls:<br />
none<br />
Postemergent controls:<br />
same as spotted spurge
Lawn Burweed<br />
Winter annual<br />
Broadleaf weed
Lawn Burweed <strong>Control</strong><br />
Important to treat in the fall<br />
Preemergent control:<br />
isoxaben<br />
Postemergent <strong>Control</strong>:<br />
same as spotted spurge
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