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WASHINGTON STATE UNIVERSITY
WHITMAN COUNTY EXTENSION'S

Weed of the Month



NOTE: contact Steve Van Vleet for information on how to get a copy of the most
recent SELECTED NOXIOUS WEEDS OF SOUTHEAST WASHINGTON.

NOTE: If you would be interested in helping finance the next Noxious Weeds of Washington publication contact Steve Van Vleet

CALENDAR YEAR
2009


JANUARY 2009
Dyer's Woad
(Isatis tinctoria L.)
 Dyer's woad, Isatis tinctoria (Capparales: Brassicaceae)   common tansy FEBRUARY 2009
Common Tansy
(Tanecetum vulgare L.)
MARCH 2009
Medusahead
(Taeniatherum caput-
medusae (L) Nevski)
 medusahead2   burdock APRIL 2009
Common Burdock
(Arctium minus Bernh.)
MAY 2009
Lupine
(Lupinus spp. L)
lupine, Lupinus spp. (Fabales: Fabaceae (Leguminosae))   indigo JUNE 2009
Indigobush
(Amorpha fruticosa L.)
JULY 2009
Oxeye Daisy
(Leucanthemum vulgare L.)
oxeye daisy   mahaleb cherry AUGUST 2009
Mahaleb Cherry
(Prunus mahalebL.)
SEPTEMBER 2009
Buffalobur
(Solanum rostratum Dunal)
buffalobur   Mediterranean sage, Salvia aethiopis (Lamiales: Lamiaceae) Flower(s)

OCTOBER 2009
Mediterranean Sage
(Salvia aethiopis L.)

NOVEMBER 2009
Garlic Mustard
(Alliaria petiolata (M. Bieb.) Cavara & Grande)

Garlicmustardvillain_1     DECEMBER 2009

For information & questions about weeds/control contact: Steve Van Vleet or Phone (509) 397-6290

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CALENDAR YEAR
2008
 
JANUARY 2008
Saltcedar
(Tamarix ramossiuma Ledeb.)

saltcedar

  ventenata FEBRUARY 2008
Ventenata
(Ventenata dubia (Leers) Durieu)
MARCH 2008
Black Henbane
(Hyoscyamus niger L.)
black henbane   v buglocc APRIL 2008
Viper's Bugloss
(Echium Vulgare L.)
MAY 2008
St. Johnswort
(Hypericum perforatum L.)

st johnswort   russian olive

JUNE 2008
Russian Olive
(Elaeagnus angustifolis L.)

 

 
    JULY 2008
Orange Hawkweed
 (Hieracium aurantiacum L.)
orange hawkweed
   horseweed AUGUST 2008
Horseweed
(Conyza Canadensis (L.) Cronq.)
SEPTEMBER 2008
Kochia
(Kochia scoparia L.)
kochia
   russian thistle OCTOBER 2008
Russian Thistle
(Salsola tragus L.,
Salsola iberica Sennen)
NOVEMBER 2008
Purple Loosestrife
(Lythrum salicaria L.)

purple loosestrife

 

 

   perennial pepperweed DECEMBER 2008
Perennial Pepperweed
(Lepidium latifolium L.)

For information & questions about weeds/control contact: Steve Van Vleet or Phone (509) 397-6290

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CALENDER YEAR
2007
 
JANUARY 2007
White Bryony
(Bryonia alba L.)
w bryony   c thistle FEBRUARY 2007
Canada Thistle
(Crisium arvense L.)
MARCH 2007
Puncturevine
(Tribulus terrestis L.)
 puncture vine   r skeletonweed APRIL 2007
Rush Skeletonweed
(Chondrilla juncea L.) 
MAY 2007
Field Bindweed
(Convolvulus arvenisis L.)
 Field Bindweed plants with flowers.   Leafy spurge JUNE 2007
Leafy Spurge
(Euphorbia esula L.) 
JULY 2007
Spotted Knapweed
(Centaurea maculosa Lam.)
Diffuse Knapweed
(Centaurea diffuse Lam.)
 spotted knapweed   y starthistle AUGUST 2007
Yellow Starthistle
(Centaurea solstitialis L.)
SEPTEMBER 2007
Scotch Thistle
(Onopordum aconthium L.)
 s thistle   s cinquefoil OCTOBER 2007
Sulfur Cinquefoil
(Potentilla recta L.)
NOVEMBER 2007
Italian Ryegrass
(Lolium multiflorum Lam.)
 i ryegrass   h cress DECEMBER 2007
Hoary Cress
(Cardaria draba (L.) Desv.)

For information & questions about weeds/control contact: Steve Van Vleet or Phone (509) 397-6290

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CALENDAR YEAR
2006
 
JANUARY 2006
Downy Brome
(Bromus tectorum L.)
d brome   m thistle FEBRUARY 2006
Musk Thistle
(Carduus nutans L.) 
MARCH 2006
Dalmation Toadflax
(Linaria dalmatica L.)
Yellow Toadflax
(Linaria vulgaris L.)
d toadflax   poison hemlock APRIL 2006
Poison Hemlock 
(Conium maculatum L.) 

MAY 2006
Common Fiddleneck
(Amsinckia micrantha Suksd.)

fiddleneck   jointed goatgrass JUNE 2006
Jointed Goatgrass   (Aegilops cylindrica Host)

JULY 2006
Annual Sowthistle
 (Sonchus oleraceus L.)

a sowthistle   mayweed AUGUST 2006
Mayweed  Chamomile
(Anthemis cotula L.) 
SEPTEMBER 2006
Houndstongue
(Cynoglossum officnale L.)
houndstongue   prickly lettuce OCTOBER 2006
Prickly Lettuce
(Lactuca Serriola L.) 
NOVEMBER 2006
Scotch Broom
(Cytisus scoparius L.)
s broom   b nightshade DECEMBER 2006
Black Nightshade
(Solanum americanum Miller) 

For information & questions about weeds/control contact: Steve Van Vleet or Phone (509) 397-6290
 

 


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More information on Washington State Weeds here.

For information and questions about weeds/control contact:
Steve Van Vleet or Phone (509) 397 - 6290

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Contact us: Ken Hathaway, klhathaway@wsu.edu 509-397-6290 | Accessibility | Copyright | Policies
Whitman County Extension, 310 N Main, Colfax, WA 99111 USA