Published online by Cambridge University Press: 12 June 2017
Flat pea (Lathyrus sylvestris L.), previously investigated as a forage plant in the United States, is a perennial legume with undesirable qualities of low palatability, difficulty of establishment, and a toxic principle. Characteristically aggressive and tolerant to a wide range of growth conditions, it is a potentially serious weed in its area of adaptation. A related species, everlasting pea (L. latifolius L.), has similar characteristics. A 2-lb/A rate of 2,4-dichlorophenoxyacetic acid (2,4-D), 2,4,5-trichlorophenoxyacetic acid (2,4,5-T), 2-(2,4,5-trichlorophenoxy)propionic acid (silvex), or 2,3,6-trichlorobenzoic acid (2,3,6-TBA) followed by 2-lb/A of silvex a year later gave complete control of established plants and seedlings of flat pea.