pendimethalin

95%tech, 40%, 33%ec,

Herbicide

HRAC  K1 WSSA  3; dinitroaniline

NOMENCLATURE

Common name pendimethalin (BSI, E-ISO, ANSI, WSSA); pendiméthaline ((f) F-ISO); penoxalin* (former WSSA name)

IUPAC name N-(1-ethylpropyl)-2,6-dinitro-3,4-xylidine 

Chemical Abstracts name N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine 

CAS RN [40487-42-1]  EEC no. 254-938-2  Development codes AC 92 553 (Cyanamid) 

PHYSICAL CHEMISTRY

Composition Tech. grade is 90% pure.  Mol. wt. 281.3  M.f. C13H19N3O4  Form Orange-yellow crystals.  M.p. 54-58 ºC  B.p. Decomposes on distillation.  V.p. 4.0 mPa (25 ºC)  KOW logP = 5.18  S.g./density 1.19 at 25 ºC  Solubility In water 0.3 mg/l (20 ºC). In acetone 700, xylene 628, corn oil 148, heptane 138, isopropanol 77 (all in g/l, 26 ºC). Readily soluble in benzene, toluene, chloroform and dichloromethane. Slightly soluble in petroleum ether and petrol.  Stability Very stable in storage; store above 5 ºC and below 130 ºC. Stable to acids and alkalis. Slowly decomposed by light. DT50 in water <21 d. 

APPLICATIONS

Biochemistry Microtubule assembly inhibition.  Mode of action Selective herbicide, absorbed by the roots and leaves. Affected plants die shortly after germination or following emergence from the soil.  Uses Control of most annual grasses and many annual broad-leaved weeds, at 0.6-2.4 kg a.i./ha, in cereals, onions, leeks, garlic, fennel, maize, sorghum, rice, soya beans, peanuts, brassicas, carrots, celery, black salsify, peas, field beans, lupins, evening primrose, tulips, potatoes, cotton, hops, pome fruit, stone fruit, berry fruit (including strawberries), citrus fruit, lettuce, aubergines, capsicums, established turf, and in transplanted tomatoes, sunflowers, and tobacco. Applied pre-plant incorporated, pre-emergence, pre-transplanting, or early post-emergence. Also used for control of suckers in tobacco.  Phytotoxicity Injury to maize may occur if used as a pre-plant, soil-incorporated treatment.  Formulation types EC; GR; WG.