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Synonyms: methyl (E)-methoxyimino[2-(o-tolyloxymethyl)phenyl]acetate (IUPAC);
CAS No.: 143390-89-0   EC No.: 417-880-0
Molecular Weight: 313.3524
Molecular Formula: C18H19NO4
Structural Formula:  Kresoxim-Methyl
m.p.: 101.6-102.5 deg.C
B.p. Decomp. 310 °C
V.p. 2.3 × 10-3 mPa (20 °C)
Kow logP = 3.4 (pH 7, 25 °C)
Henry 3.6 × 10-4 Pa m3 mol-1 (20 °C)
S.g./density 1.258 kg/l (20 °C)
Solubility In water 2 mg/l (20 °C). In n-heptane 1.72, methanol 14.9, acetone 217, ethyl acetate 123, dichloromethane 939 (all in g/l solvent, 20 °C).
Stability Hydrolysis DT50 34 d (pH 7), 7 h (pH 9); relatively stable at pH 5. pKa None in range 2–12


Kresoxim-methyl is a quinone outside Inhibitor, inhibiting mitochondrial respiration by blocking electron transfer between cytochrome b and cytochrome c1, at the ubiquinol oxidising site. Selectivity is partly due to enzymic de-esterification within plants. Mode of action Fungicide with protective, curative, eradicative and long residual disease control; acts by inhibiting spore germination. Redistribution via the vapour phase contributes to activity. Used to control scab in apples and pears (Venturia spp.); powdery mildew on apples (Podosphaera leucotricha), vines (Uncinula necator), cucurbits (Sphaerotheca fuliginea) and sugar beet (Erysiphe betae); mildew (Erysiphe graminis), scald (Rhynchosporium secalis), net blotch (Pyrenophora teres) and glume blotch (Septoria nodorum) on cereals; and mildew (Leveillula taurica, Erysiphe spp., Alternaria spp.) on vegetables.


Technical: Kresoxim methyl content 95% min.
Formulation: 25%DF, 50%DF, 30%WP, 75%WDG

Standard Packaging

Drum, bottle, carton


Risks and Safety Information

Acute oral LD50 for rats >5000 mg/kg. Skin and eye Acute percutaneous LD50 for rats >2000 mg/kg. Non-irritating to skin and eyes (rabbits). No danger of permanent damage to aquatic organisms when kresoxim-methyl is used as recommended. Birds LD50 (14 d) for quail >2150 mg/kg. Fish LC50 (96 h) for bluegill sunfish 0.499 mg/l. Algae EC50 (0–72 h) for Ankistrodesmus bibraianus 63 μg/l. Bees LD50 (48 h) (oral) 14 μg/bee; (contact) >20 μg/bee.
UN 3077; Class 9; PG III

Warning, Hazard to Environment

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