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Herbicides

Clopyralid

Chemical Name: 3,6-dichloro-2-pyridinecarboxylic acid

Formula: C6H3Cl2NO2

Molecular Weight: 192.0

CAS No.: 1702-17-6

Structure:

Description:

Appearance: Colourless crystals.

Melting Point: 151-152 °C.

Vapour Pressure: 1.33 mPa (pure, 24°C); 1.36 mPa (tech., 25°C)

Solubility: Pure (99.2%) 7.85 (in distilled water), 118 (pH 5), 143 (pH 7), 157 (pH 9) (all in g/l, 20°C). In acetonitrile 121, n-hexane 6, methanol 104 (all in g/kg). Forms water-soluble salts, for example potassium, solubility >300 g/l (25°C). 

Stability Decomposes above m.p. Stable in acidic media and to light; on hydrolysis, DT50 >30 d at pH range 5-9 (25°C) in sterile water.

Specification: 95%TC, 30%SL, 75%WDG

Uses: Post-emergence control of many annual and perennial broad-leaved weeds of the families Polygonaceae, Compositae, Leguminosae, and Umbelliferae, in sugar beet, fodder beet, oilseed rape, maize, brassicas, onions, leeks, strawberries, flax and grassland. Provides particularly good control of creeping thistle (Cirsium arvense), perennial sow-thistle, coltsfoot, mayweeds, and Polygonum spp.

 

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