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Selectivity of Bromacil on Kentucky Bluegrass and Orchardgrass¹

In field studies photosynthesis was reduced by 5-bromo-3-sec-butyl-6-methyluracil (bromacil) to greater extent in orchardgrass (Daetylis glomerata L.) than in Kentucky bluegrass (Poa pratensis L.). Foliage carbohydrates were depressed initially in bluegrass followed by recovery in 2 weeks to 1 1/2 months after bromacil application. Orchardgrass, however, did not exhibit the same degree of recovery. Application of 0.56 kg/ha bromacil each summer and fall for 2 years gave the best control of orchardgrass. During the 2nd year increased foliage crude protein was observed in treated bluegrass. Bluegrass foliage yields were equal to or greater than the controls. Orchardgrass yields were drastically reduced by bromacil. Effective seedling orchardgrass control was obtained with minimal bluegrass injury at 0.14 to 0.28 kg/ha of bromacil. Bromacil-treated soil was effectively fall-seeded with bluegrass approximately 8 weeks after a 0.56-kg/ha application. Rooting of bluegrass sod was not inhibited.

Key Words: Photosynthesis • Carbohydrates • Protein • Herbicide • Turfgrass

² Grad. Res. Asst. and Prof. of Plant Physiol., respectively, Dept. of Plant Path. and Physiol., Virginia Polytech. Inst. and State Univ., Blacksburg. Va. 24061.

Received for publication June 16, 1972.