Abstract:
Investigations were conducted in glass-house and field to determine the effects of pre-emergence applications of certain phenoxyacetates and phenylcarbamates on plant species. The effects of both types of compounds on the establishment of all monocotyledons and dicotyledons tested and on the ear formation and grain yield of a cereal Triticum vulgare, are described. The phenoxyacetates, applied in 0.1 per cent. concentrations, markedly inhibited all the dicotyledonous species. Monocotyledons were, in general, more tolerant than the dicotyledons but were affected at the higher concentrations. The phenylcarbamates produced toxic responses, in varying degrees of intensity, on all the graminaceous species tested but affected only one dicotyledon, viz. Linum usitatissimum. Symptoms of toxicity are described and some factors which appeared to govern their intensity are noted.