International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
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Herbicide Resistant Weeds in Iowa, United States.
#YearSpeciesSite of ActionActivesContacts
1 243Kochia1985Kochia scoparia
Kochia
United States
(Iowa)
IowaIA Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Jack Dekker (Retired), Micheal Owen
2 242Common Lambsquarters1989Chenopodium album
Common Lambsquarters
United States
(Iowa)
IowaIA Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Jack Dekker (Retired), Micheal Owen
3 240Pennsylvania Smartweed1990Polygonum pensylvanicum
Pennsylvania Smartweed
United States
(Iowa)
IowaIA Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Jack Dekker (Retired), Micheal Owen
4 241Giant Foxtail1992Setaria faberi
Giant Foxtail
United States
(Iowa)
IowaIA Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Jack Dekker (Retired), Micheal Owen
5 239Tall Waterhemp1993Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Iowa)
IowaIA ALS inhibitors (B/2) ALS inhibitors (B/2) imazethapyr Robert Hartzler
6 1064Giant Foxtail1994Setaria faberi
Giant Foxtail
United States
(Iowa)
IowaIA ACCase inhibitors (A/1) ACCase inhibitors (A/1) clethodim, fenoxaprop-P-ethyl, fluazifop-P-butyl, quizalofop-P-ethyl, sethoxydim Robert Hartzler
7 1062Common cocklebur1995Xanthium strumarium
Common cocklebur
United States
(Iowa)
IowaIA ALS inhibitors (B/2) ALS inhibitors (B/2) chlorimuron-ethyl, imazethapyr Robert Hartzler
8 1061Tall Waterhemp1996Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Iowa)
IowaIA Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Robert Hartzler
9 5230Common Sunflower1997Helianthus annuus
Common Sunflower
United States
(Iowa)
Iowa  ALS inhibitors (B/2) ALS inhibitors (B/2) chlorimuron-ethyl, imazethapyr Robert Hartzler, Ian Zelaya
10 5229Shattercane1998Sorghum bicolor
Shattercane
United States
(Iowa)
Iowa  ALS inhibitors (B/2) ALS inhibitors (B/2) imazethapyr Ian Zelaya
11 5231Giant Ragweed2000Ambrosia trifida
Giant Ragweed
United States
(Iowa)
Iowa  ALS inhibitors (B/2) ALS inhibitors (B/2) cloransulam-methyl, primisulfuron-methyl, prosulfuron Robert Hartzler, Ian Zelaya
12 5460Tall Waterhemp2009Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Iowa)
Iowa  PPO inhibitors (E/14) PPO inhibitors (E/14) lactofen Micheal Owen
13 5461Tall Waterhemp2009Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Iowa)
Iowa  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Micheal Owen
14 5463Giant Ragweed2009Ambrosia trifida
Giant Ragweed
United States
(Iowa)
Iowa  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Micheal Owen
15 5490Tall Waterhemp2009Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Iowa)
Iowa  ALS inhibitors (B/2), HPPD inhibitors (F2/27), Photosystem II inhibitors (C1/5) Multiple Resistance: 3 Sites of Action
ALS inhibitors (B/2)
HPPD inhibitors (F2/27)
Photosystem II inhibitors (C1/5)
atrazine, mesotrione, rimsulfuron, tembotrione, thifensulfuron-methyl, topramezone Jerry Green, Patrick Mcmullan
16 5567Horseweed2011Conyza canadensis
Horseweed
United States
(Iowa)
Iowa  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Micheal Owen
17 5576Tall Waterhemp2011Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Iowa)
Iowa  ALS inhibitors (B/2), EPSP synthase inhibitors (G/9), HPPD inhibitors (F2/27), Photosystem II inhibitors (C1/5) Multiple Resistance: 4 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
HPPD inhibitors (F2/27)
Photosystem II inhibitors (C1/5)
atrazine, chlorimuron-ethyl, glyphosate, imazamethabenz-methyl, isoxaflutole, mesotrione, thifensulfuron-methyl Micheal Owen
Contributing Weed Scientists
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Thursday, July 18, 2019 .  Available  www.weedscience.org
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