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Master Gardener Training - Weed Identification and
Management
Jeffrey Derr
Professor of Weed Science
Virginia Tech
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Additional information- Weed identification Books
• Weeds of the Northeast – Cornell Press
• Weeds of Southern Turfgrass, Georgia Cooperative Extension Service
• Weeds of the South - University of Georgia Press
• Color Atlas of Turfgrass Weeds – John Wiley & Sons
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Additional information
• Pest Management Guides
Home Grounds and Animals
http://pubs.ext.vt.edu/456/456-018/456-018.html
• Herbicide labels
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Additional Information – Weed ID Websites
www.ppws.vt.edu/ipm/weeds_container_nurseries.html
www.turfweeds.net
www.ppws.vt.edu/weedindex.htm
Virginia Tech Weed ID websites
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What is a weed?
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Prickly pear cactus
Purple loosestrife
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What is a weed?
Plant out of place, growing were it is not needed or wanted
• Purple loosestrife (Lythrum)
• Prickly pear cactus
• Bamboo
• English ivy
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Why control weeds?
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Reasons to Manage Weeds
Competition- leading to reduced crop growth and yield
(quantity, quality)
• for water (drought years)• nutrients (especially nitrogen) –cannot
correct with extra N• light (viny weeds) • pollination (dandelion blooms) – reduced
crop pollination)
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Reasons to Manage Weeds
• Harbor insect and disease pests (dandelion and tomato ringspot virus, buckhorn plantain/aphids)
• Attract bees (problem for those allergic to bee stings)
• Interfere with harvest (rash - poison ivy, spines - brambles)
• Allelopathy (natural herbicides) - juglone – black walnut
• Provide cover for rodents
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Reasons to manage weeds
• Adversely affect human health – rashes (poison ivy), poisonous if eaten (black nightshade), allergies (common ragweed), thorns (greenbrier)
• Reduce aesthetic value of lawns and gardens
• Block visibility along highways• Block water flow in ditches
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Weed names
• Common names – differ across state, country (stickweed, wiregrass, silver crabgrass, etc.)
Weed scientists used an approved list of common names for the US (horseweed, bermudagrass, goosegrass)
• Scientific name – used throughout the world
Eleusine indica (goosegrass)
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Weed life cycle
Annuals
Summer - grass, broadleaf, sedge, other monocots
Winter – grass, broadleaf
Biennials – broadleaf
Perennials – grass, sedge, other monocots, broadleaves
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Summer annual grasses
Large crabgrass
Giant foxtail
Goosegrass
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Microstegium (Japanese stiltgrass)
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Winter annual grasses
Italian (Annual) ryegrass Annual bluegrass
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Annual broadleaves
Summer common lambsquarters, smooth pigweed, common ragweed, ivyleaf morningglory
Winter vetch, horseweed, fleabane, common chickweed, henbit
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Summer annual broadleaves
Common ragweed tall morningglory
Common lambsquarters Smooth pigweed
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Winter annual broadleaves
Vetch
Common chickweed Horseweed
Henbit
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Biennials
Musk thistle Wild carrot
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Perennial Monocots
Perennial grasses
• clump - tall fescue, orchardgrass• creeping - quackgrass, bermudagrass,
johnsongrass
Perennial sedges – yellow nutsedge
Other perennial monocots – wild garlic
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Bermudagrass
Perennial grasses
Quackgrass
Johnsongrass
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Yellow and Purple NutsedgePerennial sedges (rhizomes, tubers)
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False Green Kyllinga – perennial sedge
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Other monocots
Wild garlic (perennial)
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Perennial broadleaves
• Simple – dandelion, buckhorn plantain
• Creeping - bindweed, brambles, poison ivy, horsenettle, hemp dogbane
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Dandelion Buckhorn plantain
Simple perennial broadleaves
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Creeping perennial broadleaves
Poison ivy Horsenettle
Hedge bindweed
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Perennial broadleaf weeds
Hemp dogbane Black locust
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Turf Weed Control
• Biological – none available
• Cultural
• Chemical
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Integrated Pest Management
Determine management level – high, medium, low
Scouting – identify weed problems
late spring for winter annuals
late summer for summer annuals, perennials
Determine weed infestation level/need for renovation
Evaluate control options – nonchemical vs chemical
Chemical treatments – broadcast, spot-treatment
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Cultural Control of Weeds in Turf
Use the best adapted turf species for the site
Proper mowing heights : 3-4 inches for tall fescue
Maintain appropriate pH, nutrient levels, irrigation
Correct compaction, shade, and drainage problems
Control insects and diseases
Reduce stress – drought, excess salts, etc.
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Biorational Products for Turf
Corn gluten
• By-product of corn milling• 60% protein• Preemergence herbicide• Annual weed control, esp crabgrass• No postemergence effects• ~ 10% nitrogen• Herbicidal components• Various products Safe Lawn, WOW!, A-Maize-N,
Organic Weed and Feed, etc
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Chemical Control in Turf
• Preemergence herbicides – primarily for annual weeds
• Postemergence herbicides – primarily used for perennial weeds
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Crabgrass control in turf
Preemergence
Pre + Pre
Postemergence
Pre + Post
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Preemergence Crabgrass Herbicides
– at seeding or newly-seeded cool-season turf
Tupersan (siduron)
Tenacity (mesotrione) – best applied by a lawn care company
Drive (quinclorac) – certain formulations are for commercial applicators only
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Preemergence Crabgrass Herbicides – established cool-season turf
Barricade (prodiamine)
Dimension (dithiopyr)
pendimethalin (Halts, Pre-M, Pendulum, etc.)
bensulide (Bensumec, etc.)
Team (trifluralin + benefin)
Dacthal (DCPA)
Balan (benefin)
Tupersan (siduron)
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Preemergence Crabgrass Herbicides – established warm-season turf
Barricade (prodiamine)
Dimension (dithiopyr)
pendimethalin (Halts, Pre-M, Pendulum, etc.)
bensulide (Bensumec, etc.)
Team (trifluralin + benefin)
Dacthal (DCPA)
Balan (benefin)
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Postemergence crabgrass herbicides –
cool season turf
Dimension (pre-tillering of crabgrass)
Drive/products containing quinclorac
Acclaim Extra (fenoxaprop)
Tenacity (mesotrione)
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Annual Bluegrass control
•Preemergence crabgrass herbicide in late August (probably will not be able to overseed)
•No postemergence controls for homeowners
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Preemergence Controlof Annual Broadleaf Weeds
Depends upon the herbicide
Preemergence control possible for:
Spotted (Prostrate) spurge
Common chickweed
Henbit
Others
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Preemergence broadleaf control
Gallery, Green Light Portrait (isoxaben)
Preemergence crabgrass herbicides
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Bermudagrass Suppression in Tall fescue
•Suppression/Need repeat treatments
•Acclaim Extra + Turflon, some other chemicals
•Or 2-3 applications of Roundup and reseed
•Proper mowing height
•Overseeding
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Yellow nutsedge control in Cool-season turfPostemergence control
- SedgeHammer
- Dismiss
- Basagran
-Also used for kyllinga control
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Wild Onion, Wild Garlic Control
2,4-D ester
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Broadleaf Control Chemicals
2,4-D, 2,4-DP, MCPP, MCPA, dicamba, triclopyr, clopyralid, fluroxypyr
• Usually use combinations such as • 2,4-D + MCPP • 2,4-D + MCPP + dicamba
• Leaf, root absorbed• Sprays and granular forms
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Spray versus Granular application•Spray generally provides better control since these chemicals are absorbed by leaves as well as roots
•Granular formulations – reduce potential for leaf uptake, apply when dew is present
•Granules – no spray drift, still can injure ornamentals through root uptake
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Dandelion Buckhorn plantain
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Oxalis (woodsorrel)
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Ground ivy
Triclopyr or a dicamba based product
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Wild Violet Control in Turf
Postemergence control
- triclopyr based product
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Lespedeza
- Use a triclopyr based product
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Virginia buttonweed
Repeat applications of a turf combination broadleaf herbicide - (Trimec, etc.)
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Ornamental Bed Weed control
• Cultural Control
• Chemical control
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Cultural Control in beds
• Hand-weeding, tilling, hoeing
• Mulches
– Organic : pine bark, pine straw, hardwood bark, etc
– Inorganic – rocks
– Black plastic
– Landscape fabrics
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Mulches
• 2 to 4 depth• Avoid mulch with a sulfur or ammonia odor
(sour mulch)• Free of weed seed• Control annual weeds• Rock mulches better than bark mulches for
weed control• Bark mulches can support weed growth
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Black plastic
• Controls annuals and suppresses perennial weeds (inhbits water movement, gas exchange)
• Lacks porosity
• Best fit is annuals, vegetable gardens
• Consider fabrics for long-term use
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Black plastic
• Improves weed control over mulch alone
• Lacks porosity (water, gases cannot readily move through)
• Encourages surface rooting
• Does not hold mulch well
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Landscape fabrics
• Allow for water, gas exchange
• Sacrifice on weed control compared to solid black plastic
• Shoot penetrate upward through fabric
• Root penetration downward through fabric
• Keep totally covered with 1 inch mulch
• Rock mulches better for weed control
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Chemical Weed Control in Ornamentals
• Preemergence herbicides
• Postemergence herbicides
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Annual Flower beds
• Site prep – control perennial weeds prior to planting• Rototill• Transplant• Irrigate• Apply granular trifluralin (Preen Garden Weed
Preventer, Treflan, etc)• Irrigate• Mulch
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Woody ornamental beds
• Wider choice of preemergence herbicides than in annual beds (ie Snapshot)
• Apply prior to mulching
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Postemergence Herbicides -Ornamentals
A) Selective herbicides grasses - Segment, Fusilade/Ornamec (Grass-B-Gon), Envoy, Acclaim
yellow nutsedge – Basagran, SedgeHammer woody orn directed spray
broadleaves - none
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Postemergence Herbicides -Ornamentals
B) Nonselective herbicides
• Contact – Reward
– Scythe, acetic acid based products (BurnOut, etc)
• Contact/systemic- Finale
• Systemic – glyphosate (Roundup, etc)
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glyphosate (Roundup, others)
• Off patent, many producers
• nonselective systemic
• leaf, bark absorbed
• inactivated upon contact with soil
• use under good soil moisture
• wiper or shielded spray applications
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Yellow nutsedge
• perennial sedge
• cultural control - landscape fabrics
• chemical control preemergence – Pennant Magnum,
Tower
• postemergence – SedgeHammer, Basagran, Roundup, Finale, Reward
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Bermudagrass control
Postemergence control in broadleaf ornamentals and nongrass monocots like liriope
Fusilade/Ornamec/Grass-B-Gon
Segment
Envoy
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Poison ivy
• perennial broadleaf
• postemergence control - nonselectiveglyphosate, Finale
• Triclopyr (Brush-B-Gon)
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Weed Control in Vegetable Gardens
Cultural
• Hand-weeding, hoeing, cultivation
• Mulches – grass clippings (do not use from a lawn recently treated with a post broadleaf herbicide)
• Newspaper + grass clippings
• Black plastic
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Weed Control in Vegetable Gardens
• Rototill in spring to control chickweed and other winter annuals
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Weed Control in Vegetable Gardens
Chemical Control
• Trifluralin (Preen Garden Weed Preventer, others)See PMG and label for which species can be treated at seeding, which at transplanting
• Glyphosate for site prep or after final harvest
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