Herbicide Resistant Weeds

GROUP D/22 RESISTANT HAIRY BEGGARTICKS (Bidens pilosa)
Kenya

Thursday, September 02, 2010

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Hairy Beggarticks

1.	Introduction
2.	Level of Infestation
3.	Quick Statistics
4.	Notes about this biotype
5.	Academic Aspects
6.	R Hairy Beggarticks Globally
7.	Fact Sheets and Literature
8.	Contributing Weed Scientists
9.	Acknowledgements
10.	Where to now?

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Introduction

Level of Infestation

Hairy Beggarticks (Bidens pilosa) is a dicot weed in the Asteraceae family. In Kenya this weed first evolved resistance to Group D/22 herbicides in 1991 and infests coffee. Group D/22 herbicides are known as Bipyridiliums (Photosystem-I-electron diversion). Research has shown that these particular biotypes are resistant to paraquat and they may be cross-resistant to other Group D/22 herbicides.

There is no information recorded in the database on the distribution or level of infestation of Group D/22 resistant Hairy Beggarticks from Kenya. If you have some information on this please add it to the database.

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

QUIK STATS ( last updated Sep 15, 2000 )
Common Name	Hairy Beggarticks
Species	Bidens pilosa
Group	Bipyridiliums (D/22)
Herbicides	paraquat
Location	Kenya
Year	1991
Situation(s)	coffee
Sites	unknown
Acres Infested	unknown
Contributors
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NOTES ABOUT THIS BIOTYPE

GENERAL

Malik, R. K. 1996. Herbicide resistant weed problems in the developing world and methods to overcome them. Second International Weed Control Congress. Copenhagen. Malik refers to a paper by Njoroge, J.M. 1991. Tolerance of Bidens pilosa and Parthenium hysterophorus to paraquat in Kenya. Kenya Coffee, The coffee Board of Kenya Monthly bulletin. 56 (651):999-1001.

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ACADEMIC ASPECTS

Confirmation Tests

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

Genetics

The genetic basis of resistance for this biotype is either unknown or has not been entered in the database. If you know anything about the genetic inheritance of this biotype please update the database.

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 D/22 resistant Hairy Beggarticks from Kenya please update the database.

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HERBICIDE RESISTANT HAIRY BEGGARTICKS GLOBALLY
#	Country	Year	Sites	Acres	Mode of Action
1.	Brazil	1993	51-100	1001-10000	ALS inhibitors (B/2)
2.	Kenya	1991	unknown	unknown	Bipyridiliums (D/22)

FACT SHEETS AND OTHER LITERATURE	Format
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Scientific Abstracts on Herbicide Resistant Bidens pilosa
Dose response curves of resistant and susceptible Bidens pilosa to ALS inhibitor herbicides.
Christoffoleti, P. J. and L. Foloni L. 1999. Dose response curves of resistant and susceptible Bidens pilosa to ALS inhibitor herbicides. 1999 Brighton crop protection conference: weeds. Proceedings of an international conference, Brighton, UK, 15-18 November 1999. 1: 159-162.
Herbicide resistant weed problems in developing world and methods to overcome them.
Malik, R. K., H. Brown (ed.), G. W. Cussans (ed.), M. D. Devine (ed.), S. O. Duke (ed.), C. Fernandez Quintanilla (ed.), A. Helweg (ed.), R. E. Labrada (ed.), M. Landes (ed.), P. Kudsk (ed.), and J. C. Streibig. 1996. Herbicide resistant weed problems in developing world and methods to overcome them. Proceedings of the second international weed control congress, Copenhagen, Denmark, 25-28 June 1996. 1-4: 665-673.
Tolerance of Bidens pilosa L and Parthenium hysterophorus L to paraquat (Gramoxone) in Kenya coffee.
Njoroge, J. M. 1991. Tolerance of Bidens pilosa L and Parthenium hysterophorus L to paraquat (Gramoxone) in Kenya coffee. Kenya Coffee. 56: 999-1001.

Acknowledgements

Where to now?

The Herbicide Resistance Action Committee, the Weed Science Society of America, and weed scientists in Kenya have been instrumental in providing you this information.

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