select Select by Species Abutilon theophrasti Acalypha australis Ageratum conyzoides Agrostis stolonifera Alisma canaliculatum Alisma plantago-aquatica Alopecurus aequalis Alopecurus japonicus Alopecurus myosuroides Amaranthus albus Amaranthus blitoides Amaranthus blitum (ssp. oleraceus) Amaranthus cruentus Amaranthus hybridus (syn: quitensis) Amaranthus palmeri Amaranthus powellii Amaranthus retroflexus Amaranthus spinosus Amaranthus tuberculatus (=A. rudis) Amaranthus viridis Ambrosia artemisiifolia Ambrosia trifida Ammannia auriculata Ammannia coccinea Ammannia multiflora Anthemis arvensis Anthemis cotula Anthriscus caucalis Apera spica-venti Arabidopsis thaliana Arctotheca calendula Arenaria serpyllifolia Aster squamatus Atriplex patula Avena fatua Avena sterilis Avena sterilis ssp. ludoviciana Bacopa rotundifolia Beckmannia syzigachne Bidens pilosa Bidens subalternans Bidens tripartita Bifora radians Blyxa aubertii Brachiaria eruciformis Brachypodium distachyon Brassica rapa (=B. campestris) Brassica tournefortii Bromus catharticus Bromus commutatus Bromus diandrus Bromus diandrus ssp. rigidus (=B. rigidus) Bromus japonicus Bromus madritensis Bromus rubens Bromus secalinus Bromus sterilis Bromus tectorum Buglossoides arvensis (=Lithospermum arvense) Camelina microcarpa Capsella bursa-pastoris Carduus acanthoides Carduus nutans Carduus pycnocephalus Centaurea cyanus Centaurea solstitialis Centaurea stoebe ssp. micranthos Chamaesyce maculata Chenopodium album Chenopodium album var. striatum (=C. strictum var. glaucophyllum) Chenopodium ficifolium Chenopodium polyspermum Chenopodium simplex (=C. hybridum) Chloris barbata = (C. inflate) Chloris elata Chloris radiata Chloris truncata Chloris virgata Chrysanthemum coronarium Cirsium arvense Clidemia hirta Commelina diffusa Convolvulus arvensis Conyza bonariensis Conyza canadensis Conyza sumatrensis Crassocephalum crepidioides Crepis tectorum Crypsis schoenoides Cuphea carthagenensis Cuscuta pentagona (=C. campestris) Cynodon hirsutus Cynosurus echinatus Cyperus brevifolius Cyperus compressus Cyperus difformis Cyperus esculentus Cyperus iria Cyperus odoratus Damasonium minus Datura stramonium Daucus carota Descurainia sophia Digitaria ciliaris Digitaria insularis Digitaria ischaemum Digitaria nuda Digitaria sanguinalis Diplotaxis erucoides Diplotaxis tenuifolia Dopatrium junceum Echinochloa colona Echinochloa crus-galli var. crus-galli Echinochloa crus-galli var. formosensis Echinochloa crus-galli var. zelayensis Echinochloa crus-pavonis Echinochloa erecta Echinochloa oryzoides Echinochloa phyllopogon (=E. oryzicola) Echium plantagineum Ehrharta longiflora Elatine triandra var. pedicellata Eleocharis acicularis Eleusine indica Epilobium ciliatum Epilobium tetragonum Erigeron philadelphicus Eriochloa punctata Erucaria hispanica Erysimum repandum Euphorbia heterophylla Fimbristylis miliacea Fumaria densiflora Galeopsis tetrahit Galinsoga ciliata Galinsoga parviflora Galium aparine Galium spurium Galium tricornutum Gamochaeta pensylvanica Glebionis segetum Hedyotis verticillata Helianthus annuus Hirschfeldia incana Hordeum jubatum Hordeum murinum ssp. glaucum Hordeum murinum ssp. leporinum Hydrilla verticillata Ischaemum rugosum Iva xanthiifolia Ixophorus unisetus Kochia scoparia Lactuca saligna Lactuca serriola Lamium amplexicaule Landoltia punctata Lepidium virginicum Leptochloa chinensis Leptochloa fusca spp. fasicularis Leptochloa panicoides Leptochloa scabra Leptochloa virgata Limnocharis flava Limnophila erecta Limnophila sessiliflora Lindernia dubia (=Lindernia dubia var. major) Lindernia micrantha Lindernia procumbens Lithospermum arvense Lolium perenne Lolium perenne ssp. multiflorum Lolium persicum Lolium rigidum Ludwigia prostrata Matricaria discoidea Matricaria recutita (= M. chamomilla) Mazus fauriei Mazus pumilus Mesembryanthemum crystallinum Mitracarpus hirtus Monochoria korsakowii Monochoria vaginalis Myosoton aquaticum Nassella neesiana Nassella trichotoma Neslia paniculata Oryza sativa var. sylvatica Panicum capillare Panicum dichotomiflorum Panicum miliaceum var. ruderale Kitag. Papaver rhoeas Parthenium hysterophorus Paspalum paniculatum Pentzia suffruticosa Phalaris brachystachys Phalaris minor Phalaris paradoxa Picris hieracioides Plantago lagopus Plantago lanceolata Poa annua Poa trivialis Polygonum aviculare Polygonum convolvulus (=Fallopia convolvulus) Polygonum hydropiper Polygonum lapathifolium Polygonum pensylvanicum Polygonum persicaria Polypogon fugax Polypogon monspeliensis Portulaca oleracea Ranunculus acris Raphanus raphanistrum Raphanus sativus Rapistrum rugosum Rorippa indica Rostraria smyrnacea (=Lophochloa smyrnacea) Rotala indica var. uliginosa Rotala pusilla Rottboellia cochinchinensis (=R. exaltata) Rumex acetosella Rumex dentatus Rumex obtusifolius Sagittaria guayanensis Sagittaria montevidensis Sagittaria pygmaea Sagittaria trifolia Salsola tragus Schoenoplectus fluviatilis Schoenoplectus juncoides Schoenoplectus mucronatus (=Scirpus mucronatus) Schoenoplectus wallichii Sclerochloa dura Sclerochloa kengiana Secale cereale Senecio vernalis Senecio vulgaris Setaria adhaerens Setaria faberi Setaria pumila (=S. glauca) Setaria verticillata Setaria viridis Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea) Sida spinosa Silene gallica Sinapis alba Sinapis arvensis Sisymbrium orientale Sisymbrium thellungii Snowdenia polystachya Solanum americanum Solanum nigrum Solanum ptycanthum Soliva sessilis Sonchus asper Sonchus oleraceus Sorghum bicolor Sorghum bicolor ssp. drummondii (=Sorghum sudanese) Sorghum halepense Spergula arvensis Sphenoclea zeylanica Sporobolus fertilis Steinchisma laxum Stellaria media Thlaspi arvense Tridax procumbens Tripleurospermum perforatum (=T. inodorum) Urochloa panicoides Urochloa plantaginea (=Brachiaria plantaginea) Urtica urens Vaccaria hispanica Vicia sativa Vulpia bromoides Xanthium strumarium Youngia japonica Zea mays ssp. mexicana

select Select by Common Name African Mustard African Turnipweed Alexandergrass Amazon Sprangletop American Black Nightshade American Sloughgrass Annual Bluegrass Annual Falsebrome Annual Sedge Annual Sowthistle Arrocillo Arrowleafed Monochoria Asia Minor bluegrass Asian Copperleaf Asian Mazus Asiatic Hawksbeard Azetogarashi (Japanese) Ball Mustard Barnyardgrass Bearded Sprangletop Birdsrape Mustard Black Nightshade Blackgrass Bristly Foxtail Broad-Leaved Dock Buckhorn Plantain Bur Beggarticks Bur Bristlegrass Bur Chervil Burning Nettle Bushy Wallflower California Arrowhead Calomba daisy Canada thistle Capeweed Catchweed Bedstraw Catstail Cheat (Rye Brome) Chilean or Uruguayan Needlegrass Chinese Sprangletop Coat Buttons Common Chickweed Common cocklebur Common False-pimpernel; Azena (Japanese) Common Groundsel Common Hempnettle Common Lambsquarters Common Purslane Common Ragweed Common Sunflower Common Vetch Common Waterplantain Compact Brome Corn Chamomile Corn Gromwell Corn Gromwell Corn Marigold Corn Poppy Corn Spurry Cornflower Cowcockle Creeping Bentgrass Crown daisy Crystalline Iceplant Dense-flowered Fumitory Disc Waterhyssop Dopatrium Dotted Duckweed Downy Brome (Cheatgrass) Dwarf Arrowhead Eared Redstem Early Watergrass Eastern Black Nightshade Eastern Groundsel English Catchfly Ethiopian grass Fall Panicum False Cleavers False Loosestrife Feather Fingergrass Feral Rye Field Bindweed Field Dodder Field Pennycress Figleaved Goosefoot Flixweed Foxtail Barley Fragrant Flatsedge Fringed Willowherb Gallant Soldier Giant Foxtail Giant Goosefoot Giant Green Foxtail Giant Parramatta grass Giant Ragweed Globe Fringerush Goosegrass Gooseweed Gramilla mansa Greater Beggarticks Green Foxtail Gulf Cockspur Gulf Cockspur Grass Guyanese Arrowhead Hairy Beggarticks Hairy Fleabane Hairy Galinsoga Halberdleaf Orach Hardgrass Hare Barley Hare's Foot Plantain Hawkweed Oxtongue Hedgehog Dogtailgrass Henbit Deadnettle Hera-omodaka Hood Canarygrass Horseweed Hydrilla Italian Ryegrass Italian Thistle Itchgrass Japanese Brome Japanese Foxtail Japanese Mazus Jimsonweed Johnsongrass Junglerice Keng Stiffgrass Kikashigusa Kochia Ladysthumb Large Crabgrass Late Watergrass Lateflowering Goosefoot Lawn Burweed Lax Panicgrass Limnophila (Asian marshweed) Little seed Canary grass Liverseedgrass Livid Amaranth Longflowered veldtgrass Low False-pimpernel Many Flowered Ammannia Manyseeded Goosefoot Marshelder Marshpepper Smartweed Marshweed Mayweed Chamomile Meadow Brome Mexican teosinte Mizohakobe (Waterwort) Mizuaoi (JPN)/Moolokzam (KOR) Mizu-matsuba Mouse-ear Cress Musk Thistle Naked Crabgrass Narrowleaf Hawksbeard Needle Spikerush Oriental Mustard Pale Smartweed Palmer Amaranth Pasto Amargo Pasto Honduras (Mexicangrass) Patersons Curse Pennsylvania Everlasting Pennsylvania Smartweed Perennial Ryegrass Perennial Wallrocket Persian Darnel Philadelphia Fleabane Pineapple-weed Plumeless Thistle Pollacci Barnyardgrass Poverty Brome Powell Amaranth Prickly Lettuce Prickly Sida Prostrate Knotweed Prostrate Pigweed Rabbitfoot Polypogon Radiate Fingergrass Radish Ragweed Parthenium Red Amaranth Red Brome Red Rice Redflower Ragleaf Redroot Pigweed Redstem Rescuegrass Rice Flatsedge Ricefield Bulrush Rigid Brome Rigid Ryegrass Ripgut Brome River Bulrush Rock Bulrush Rough Sprangletop Roughstalk Bluegrass Roundfruit Blyxa Russian-thistle Saltmarsh Aster Saramollagrass Sawah Flowering Rush Scentless Chamomile Serrated Tussock Shattercane Sheep Sorrel Shepherd's-purse Shortawn Foxtail Shortleaf Spikesedge Shortpod Mustard Shortspike Canarygrass Silky Windgrass Slender Amaranth Smallflower Umbrella Sedge Smallseed Flaxfalse Smooth Barley Smooth Crabgrass Smooth Pigweed Soapbush Sourgrass Southern Crabgrass Spanish Pink Mustard Spiny Amaranth Spiny Sowthistle Spotted knapweed Spotted Spurge Spreading Dayflower Square-stalked Willowherb Squirreltail Fescue Starfruit Sterile Oat Sterile oat Sudangrass Sumatran Fleabane Swamp Pricklegrass Sweet Summer Grass Swollen Fingergrass Taiwan barnyardgrass Taiwan-yamai Tall Buttercup Tall Waterhemp Tall Windmill Grass Tarweed Cuphea Threehorn Bedstraw Threeleaf Arrowhead Thymeleaf Sandwort Toothed Dock Tropical Girdlepod Tropical Sprangletop (Juddsgrass) Tropical Whiteweed Tumble Pigweed Turnipweed Variableleaf Yellowcress Velvetleaf Virginia Pepperweed Water Starwort White Mustard White Wallrocket Wild Bishop Wild Buckwheat Wild Carrot Wild Chamomile Wild Mustard Wild Oat Wild Panicgrass Wild Poinsettia Wild Radish Willow-leaved lettuce Windmill Grass Witchgrass Woody borreria Yellow Foxtail Yellow Nutsedge Yellow Starthistle

Herbicide Resistant Rice Flatsedge Globally (Cyperus iria)
Herbicide Resistant Rice Flatsedge Globally (Cyperus iria) Drag a column header and drop it here to group by that column

Herbicide Resistant Rice Flatsedge Globally (Cyperus iria)

#	Country	Country	StateName	FirstYear	Situation	Active Ingredients	CountryID	Site of Action	WeedID	Species	CommonName	ResistID
1	Brazil	Brazil		2014	Rice	bispyribac-sodium, imazapic, imazethapyr, penoxsulam, and pyrazosulfuron-ethyl	5	Inhibition of Acetolactate Synthase (B/2)	266	Cyperus iria	Rice Flatsedge	13040
2	Dominican Republic	Dominican Republic		2024	Rice	bispyribac-sodium, cyhalofop-butyl, diclofop-methyl, imazamox, penoxsulam, and propanil	96	Multiple Resistance: 3 Sites of Action Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Acetolactate Synthase (B/2) PSII inhibitors - Serine 264 Binders (C1 C2/5)	266	Cyperus iria	Rice Flatsedge	36287
3	United States (Arkansas)	United States	Arkansas	2010	Rice	bispyribac-sodium, halosulfuron-methyl, imazamox, imazethapyr, and penoxsulam	45	Inhibition of Acetolactate Synthase (B/2)	266	Cyperus iria	Rice Flatsedge	5560
4	United States (Louisiana)	United States	Louisiana	2013	Rice	halosulfuron-methyl	45	Inhibition of Acetolactate Synthase (B/2)	266	Cyperus iria	Rice Flatsedge	7785
5	Venezuela	Venezuela		2015	Rice	pyrazosulfuron-ethyl	80	Inhibition of Acetolactate Synthase (B/2)	266	Cyperus iria	Rice Flatsedge	11015

PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site.
Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Sunday, September 13, 2026 .  Available  www.weedscience.org
Copyright © 1993- 2026 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.