Populations of several weed species have become resistant to certain herbicides. In some cases this is a result of a mutation which has changed the physiological site at which the herbicide acts. This site-specific change confers resistance to a single herbicide or group of herbicides with the same mode of action. Thus triazine resistant biotypes of dicotyledons have a photosynthetic pathway which has been altered by a specific mutation rendering it resistant to the standard triazine herbicides such as simazine and atrazine. An ACC-ase mutant Lolium rigidum is resistant to the grass herbicides such as alloxydim and fluazifop which inhibit the enzyme acetyl-coenzyme A carboxylase. An ALS mutant Lolium rigidum is resistant to the sulphonylurea and imidazolinone herbicides which inhibit acetolactate synthase.*

Another type of resistance is a result of enhanced metabolism which may result in a range of herbicides with different modes of action being more rapidly decomposed by the resistant biotype than by the normal populations of the species. Thus certain biotypes of Lolium rigidum and Alopecurus myosuroides are resistant to a wide range of herbicides such as chlortoluron, pendimethylin and dichlofop which are readily susceptible to metabolic breakdown.

Herbiseed has the following resistant biotypes:

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CAT.No.

SPECIES  

1000g. 100g. 25g.   1000g.
    PRICE IN: POUNDS STERLING (GB£)   EURO
9900 BIDENS PILOSA (paraquat resistant)

650

85

29

   1040
9901 AMARANTHUS RETROFLEXUS (triazine resistant)

125

17

6

   200
9902 CHENOPODIUM ALBUM (triazine resistant)

125

17

6

   200
9903 POLYGONUM LAPATHIFOLIUM (triazine resistant)

125

17

6

   200
9904 SENECIO VULGARIS (triazine resistant)

850

111

37

   1360
9905 SOLANUM NIGRUM (triazine resistant)

125

17

6

   200
9906 ALOPECURUS MYOSUROIDES (Peldon, multi-resistant)

450

59

20

   720
9907 ALOPECURUS MYOSUROIDES (Spain, multi-resistant)

350

46

16

   560
9908 LOLIUM RIGIDUM VLR69 (multi-resistant)

600

78

26

   960
9909 LOLIUM RIGIDUM SLR31 (multi-resistant)

600

78

26

   960
9910 LOLIUM RIGIDUM WLR1 (ALS-mutant)

900

130

43

   1600
9911 LOLIUM RIGIDUM WLR96 (ACC-ase mutant)

600

78

26

   960
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Herbiseed, New Farm, Mire Lane, West End, Twyford, RG10 0NJ, England.
Tel: +44 (0) 1189 349 464  Fax: +44 (0) 1189 241 996  e-mail: [email protected]