Comparative tolerance of some dicotyledons to pronamide and chlorpropham

Abstract

In laboratory tests with 115 species of dicotyledons, the concentration of pronamide in water for 50% inhibition of root elongation ranged from 0.03 to >8 parts/million. With certain exceptions, species within a family responded similarly. Polygonaceae and Caryophyllaceae were the most susceptible and Compositae the most tolerant, as they were also to chlorpropham. There was good correspondence between the test results and the relative susceptibility of species to pre‐emergence application in the field.

Measured and computed concentration patterns of propyzamide in field soils

“…A close connection can therefore be expected between the phytocidal activity and the concentration of propyzamide. The procedure for estimating concentration-time relations at different depths in soil is especially useful when combined vuith the data assembled by Roberts & Ricketts (1973) on the phytocidal activity of propyzamide on a number of plant species. Quite accurate predictions can be made about the action of the herbicide to specific combinations of weed, crop, weather, and following crop.…”

Application of bioassay techniques to herbicide investigations

“…Neururer (1972) examined fifty herbicides with the cress {Lepidium sativum) root length test and found it was sensitive to terbacil, lenacil and chloroxuron. Among other species used are flax for endothal (Hiltibran, 1962), buckwheat for pronamide (Roberts & Ricketts, 1973), ryegrass for dichlobenil (Horowitz, 1966b), lettuce for picloram (Reid & Hurtt, 1969).…”