International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
(Sorghum bicolor ssp. drummondii (=Sorghum sudanese))

ACCase inhibitors (A/1)

Bolivia, Santa Cruz
Sudangrass (Sorghum bicolor ssp. drummondii (=Sorghum sudanese)) is a monocot weed in the Poaceae family.  In Bolivia this weed first evolved resistance to Group A/1 herbicides in 1999 and infests Soybean.   Group A/1 herbicides are known as ACCase inhibitors (Inhibition of acetyl CoA carboxylase (ACCase)).  Research has shown that these particular biotypes are resistant to fenoxaprop-P-ethyl, fluazifop-P-butyl, haloxyfop-P-methyl, and quizalofop-P-tefuryl and they may be cross-resistant to other Group A/1 herbicides.

The 'Group' letters/numbers that you see throughout this web site refer to the classification of herbicides by their site of action. To see a full list of herbicides and HRAC herbicide classifications click here.

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QUIK STATS (last updated Dec 21, 2000 )

Common NameSudangrass
SpeciesSorghum bicolor ssp. drummondii (=Sorghum sudanese)
GroupACCase inhibitors (A/1)
Herbicidesfenoxaprop-P-ethyl, fluazifop-P-butyl, haloxyfop-P-methyl, and quizalofop-P-tefuryl
LocationBolivia, Santa Cruz
Contributors - (Alphabetically)Pablo Franco 
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Pablo Franco
Provincias: Obispo Santiesteba, Sara y Chiquitos

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Pablo Franco
This annual grass has relative tolerance to pendimethalin, clomazone, and acetochlor. With Eriochloa punctata it is the most predominant grass weed in soyabean, maize, and sugar cane. It has a wider range of adaptation compared to Eriochloa punctata.

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Confirmation Tests

Greenhouse trials comparing a known susceptible Sudangrass biotype with this Sudangrass biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.

Genetic studies on Group A/1 resistant Sudangrass have not been reported to the site.  There may be a note below or an article discussing the genetics of this biotype in the Fact Sheets and Other Literature
Mechanism of Resistance

The mechanism of resistance for this biotype is either unknown or has not been entered in the database.  If you know anything about the mechanism of resistance for this biotype then please update the database.
Relative Fitness

There is no record of differences in fitness or competitiveness of these resistant biotypes when compared to that of normal susceptible biotypes.  If you have any information pertaining to the fitness of Group A/1 resistant Sudangrass from Bolivia please update the database.
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BASF Bolivia
Research and Development
Av. San Martin No 1800
of 302
Santa Cruz, de la sierra 237, Santa Cruz
Email Pablo Franco


The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Bolivia have been instrumental in providing you this information. Particular thanks is given to Pablo Franco for providing detailed information.
Herbicide Resistant Sudangrass Globally
(Sorghum bicolor ssp. drummondii (=Sorghum sudanese))
Herbicide Resistant Sudangrass Globally
(Sorghum bicolor ssp. drummondii (=Sorghum sudanese))
Drag a column header and drop it here to group by that column
Herbicide Resistant Sudangrass Globally
(Sorghum bicolor ssp. drummondii (=Sorghum sudanese))
#CountryFirstYearSituationActive IngredientsSite of Action
1 BoliviaBolivia 1999 Soybean fenoxaprop-P-ethyl, fluazifop-P-butyl, haloxyfop-P-methyl, and quizalofop-P-tefuryl 4 ACCase inhibitors (A/1)
187Sorghum bicolor ssp. drummondii (=Sorghum sudanese)Sudangrass1149
Literature about Similar Cases

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Thursday, January 21, 2021 .  Available
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