SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 23950585
CASRN 23950-58-5
SynonymsPronamide
Kerb
3,5-Dichloro-N-(1,1-dimethyl-2-propynyl)benzamide
Benzamide, 3,5-dichloro-N-(1,1-dimethyl-2-propynyl)-
Analytical Method EPA Method 8270
Molecular FormulaC12H11CL2NO

Link to the National Library of Medicine's Hazardous Substances
Database for more details on this compound.

Use HERBICIDE FOR VEGETABLES-EG, LETTUCE; OTHER FIELD CROPS; FOR PASTURE & RANGELAND
Consumption Patterns HERBICIDE FOR VEGETABLES, 46%; FOR OTHER FIELD CROPS, 46%; FOR PASTURE & RANGELAND, 8% (1982)
Apparent Color OFF-WHITE SOLID; WHITE CRYSTALS; NEEDLES
Odor ODORLESS
Melting Point 155-157 DEG C
Molecular Weight 256.13
Sensitivity Data THE WETTABLE POWDER FORMULATION IS ONLY MILDLY IRRITATING TO EYES & SKIN.
Environmental Fate TERRESTRIAL: VERY LITTLE LEACHING OF PRONAMIDE OCCURS IN MOST SOIL TYPES. PRONAMIDE IS READILY ABSORBED ON ORGANIC MATTER & COLLOIDAL EXCHANGE SITES. PERSISTENCE OF PRONAMIDE IS VARIABLE (2-9 MO) DEPENDING UPON SOIL TYPE & CLIMATIC CONDITIONS. RESIDUAL ACTIVITY IS GREATER IN SANDY SOILS WITH LOW ORGANIC MATTER. ACCUMULATION FROM REPEATED ANNUAL APPLICATIONS TO SAME SOIL IS NOT A PROBLEM. TERRESTRIAL: THE DECLINE OF PROPYZAMIDE IN SOIL UNDER FIELD CONDITIONS IN THE NETHERLANDS WAS STUDIED WITH 2 BIOASSAYS (ROOT LENGTH ASSAY & SHOOT ASSAY). IT WAS FOUND THAT LESS PESTICIDE WAS AVAILABLE TO PLANTS AS THE ORGANIC CONTENT OF THE SOIL INCREASED & THAT TYPE OF SOIL DOES NOT APPEAR TO INFLUENCE THE RATE OF DECLINE. RATE OF DISAPPEARANCE OF PROPYZAMIDE WAS HIGH IN SOIL EVEN AT LOW TEMP. AFTER TREATMENT DURING CULTIVATION OF LETTUCE, A SUSCEPTIBLE CROP CAN BE GROWN ONLY AFTER INTERVAL OF 6 MO. TERRESTRIAL: MOVEMENT OF PRONAMIDE IS GREATEST IN COARSE TEXTURED SOILS. LEACHING OF MOST SOIL RESIDUALS OCCURS IN LOAMY SANDS AND IN SILT LOAMS. Terrestrial: Delayed herbicide application caused by late spring, or delayed degradation caused by drought, exceptionally cold winter, and nontillage agriculture led to crop damage by herbicide residues. Winter wheat and barley, grasses, spring cereals, and other crops were injured by after-effects of propyzamide and other herbicides. Terrestrial: Spring spraying of 3 kg kerb/ha controlled weeds and left 0.15 mg propyzamide/kg in harvested flower heads of Anthemis nobilis and the top 5 cm of soil. At 5-10 cm, the residue was 0.056 mg/kg. The rate of herbicide decay depended more on the temp than on the soil moisture.

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