University of Maryland Extension

Weed of the Week Index

Landscape and Nursery IPM Reports:

Weeds for 2011-2016:

Algae, filamentous 15Aug14
Amaranth, palmer 15May 01
11Jun24
Amaranth, spiny 11Jun03
Automation and weed control 12Sep07
Bamboo 14May16
Barberry, Japanese 14Jun06
Bedstraw, catchweed 13May24
Beefsteak plant (Perilla frutescens) 15Jul24
Beggartick, nodding 13Aug02
Bermudagrass 15Jul17
Bittercress, hairy

14Sep05,
12Oct05
, 12Mar16

Bittersweet, Oriental/Asiatic

15Jul10

Bluegrass, annual and roughstalk

15Apr24
14May02

14Apr18
12Apr06

Bluegrass, roughstalk 13May03
British yellowhead (meadow fleabane) 12Jul13
Broadleaf weed control alternatives 13Oct25, 13Oct18, 13Sep20
Brunnera macrophylla 'Dawson's White' 16Oct14
Burcucumber 16Oct07
11Jul01
Buttercup, bulbosus (Ranunculus bulbosus) 16May20
14May30
Buttonweed, Virginia 12Oct05
Canarygrass, reed 12Jun22
Carpetgrass (Arthraxon hispidus) 13Jul19
Cat's ear, common (false dandelion) 12Jul06
Chickory (Cichoriium intybus) 16Oct21
Chickweed, common 16Apr15
Chinese yam (Dioscorea batatas) 13May31
Cinquefoil, common 14Oct24
Cinquefoil, sulfur 12May11
Clematis terniflora 11Oct21
Clover, white 12Jun01, 12May25 (a lot in nurseries this year)
11Sep30
Cocklebur, common 13Oct18
Crabgrass 16Mar18 (early spring control)
13Apr19
12Mar09
(Jeffrey Derr article)
11Mar18 (focus on control)
Daisy, fleabane 14Oct03
Dayflower, Asiatic or common 14Jul11
Deadnettle, purple 16Apr29
12Apr13
Deadnettle, white spotted (Lamium maculatum) 16Apr08
Dock, broadleaf 13Apr12
Dodder 15Jul31
13Jun21
11Aug26
Dogbane, hemp 12Aug03
Dollar weed 13Oct11
Drift issues 13May17
False (also fool's) parsley (Aethusa cynapium) 16May27
Fescue, meadow 11May06
Foxtail, giant 13Sep06
12Oct19
Geranium, Carolina 16Jun10
14Jun27
Goat's beard (Tragopogon dubius) 16Jul01
Goutweed (Aegopodium podagraria) 15Jun05
Greenbrier (Smilax spp.) 15Oct16
Groundsel, common 13Jul05
Hemlock, poison 13Jun14
Herbicide use and rainscapes 14Sep12
Herbicides: Understanding why they work 14Apr04
Hog peanut 16Sep16
Hogweed, giant 13Jun28
12Jun08
Horsenettle 13Jul26
Indian mock strawberry (Duchesnea indica) 15Oct09
Invasive plants - New MDA Tier 1 and Tier 2 plants 16Apr29
Jewelweed (Impatiens capensis), native, but reseeds well and can be a problem in some situations 16Jul22
Johnsongrass 11Jul29
Joint-head grass (Arthraxon hispidus) 15Oct01
Knapweed, spotted 11Apr08
Knotweed, Japanese 16Jun17
15May08

13Aug30
Knotweed, prostrate 11Jun10
Lambsquarters 13Sep20
Lespedeza, Chinese 11Oct07
Lespedeza, common (Kummerowia striata (syn. Lespedeza striata)

16Oct28
14Jul03

12Aug31

Lesser celandine

16Apr01, 16Mar18 (sighting for report)
14Apr11

13Mar22
11Apr15

Lesser-seeded bittercress 13Mar29
Lettuce, prickly (Latuca scariola) 15Jun26
Lettuce, willow leaf (Lactuca saligna) 15May29
Marestail 13Jul12
Medic, black 14Oct17
Mile-a-minute weed 16Aug12
13Jul05
, 13Jun28
Morning glory, ivyleaf 12Sep14
Morning glory, tall 14Aug22
Mulberry tree 14Aug15
Mulberry weed 13Aug23
11Jul08
Mullein, common 12Aug10
Mustard, blue 13Apr05
11Apr15
Mustard, garlic 15Jun12
Nettle, European stinging 12Aug24
Nightshade, bittersweet (Solanum dulcamara) 16Jul15
Nimblewill (Muhlenbergia shreberi) 15Sep04
Nutsedge, yellow 16Sep23 (photo of nutlets)
16Jul08

15Mar20
(control update)
14Aug08
Panicum, fall 16Oct14, 16Aug26
11Sep23
Parsnip, wild 12Mar09
Pennycress, thoroughwort 11May13
Phyllanthus, long-stalked 15Oct30
Plantain, broadleaf 14Jun13
Pokeweed 14Aug01
Porcelainberry 14Sep12
Prickly lettuce 11Apr22
Purslane, common 14Sep25
Queen Anne's Lace (Daucus carota) 15Sep25
Radish, wild 11May27
Ragweed, common 11Sep02
Ragweed, giant 12Jul20
Ragworm 13Apr26
Ravenna-grass 11Oct14
Redstem filaree 11Sep09
Salsify (or goat's beard) 12Jun01
Sandbur (Cenchrus) 15Sep18
Shepherd's purse (Capsella bursa-pastoris) 16Apr22
Smartweed, Pennsylvania 12Jun15
Sorrel, red 12Sep07
Sowthistle, common 11Apr29
Sowthistle, spiny 12May25
Spurge, spotted 16Aug19
14Jul18
Star-of-Bethlehem (Ornithogalum umbellatum) 15May22
Stiltgrass, Japanese 12Apr20
11Oct07 (fungus found that infects this weed)
Teasel, common 11Aug05
Thistle, Canada 16Sep30 (infected by bacteria)
13May10
11Apr01
Thistle, nodding 15Aug21
Thistle, tall (Cirsium altissimum) 16Jun03
Timothy (Phleum pretense) 16May13
Tree of heaven (Ailanthus altissima) 15Jul02
Velvetleaf 11Jul22
Violet, field 12Mar30
Violet, wild 13Sep27
Virginia buttonweed 11Sep16
Virginia creeper 14May23
Weed control and heavy rains 15Jul02
Weed control challenges: timing, soil moisture 16Sep02
15Aug07
Weed control problems in turf 13Aug09
Weed control: management practices 15Oct23
Weed control: soil temperatures 16Mar25
Weed control review for fall germinating weeds 15Aug14
Weeds in perennial beds 13Aug30
Weed management in spring 14Mar28
Wild violets (Viola pratincola) 16May06
Wineberry (Rubus phoenicolasius) 16Nov04
12Jul27
Witchgrass (Panicum capillare) 16Jul29
Woodsorrel, yellow 14Sep19
Yellow archangel 11Oct28
Yellow rocket 12Nov02
Yellowcress, marsh 15Jun19
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