Published online by Cambridge University Press: 12 June 2017
Watering with 1 surface cm or more following spray treatment with dicamba (2-methoxy-3,6-dichlorobenzoic acid) and picloram (4-amino-3,5,6-trichloropicolinic acid) markedly increased inhibition of shoot growth from rhizome sections of quackgrass (Agropyron repens (L.) Beauv.) and bromegrass (Bromus inermis Leyss). Shoots were most sensitive to the herbicides at early stages of development. Bromegrass and quackgrass were about equally susceptible to the two herbicides. Uptake through roots or rhizomes was more effective than foliar uptake. Kentucky bluegrass in established sod was not injured by dosages of the two herbicides that killed or controlled quackgrass. Young stands of Kentucky bluegrass were more sensitive.