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SELECTIVE CONTROL OF ANNUAL BLUEGRASS IN KENTUCKY BLUEGRASS TURF WITH LINURON
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Optimum top growth of annual bluegrass (Pao annua L.) and Kentucky bluegrass (Poa pratensis L.) was obtained at 24/12 °C day/night temperature regime in controlled environment studies. The tolerance of seedling Kentucky bluegrass to linuron [3-(3,4-dichlorophenyl)-1)methylurea] appeared to be greatest at this temperature regime when photoperiods were 16 h in length. A granular formulation of linuron gave excellent control of annual bluegrass in Kentucky bluegrass turf at 6.7 kg/ha when applied postemergence. At this rate, all culitivars of Kentucky bluegrass tested, with the exception of Fylking, were tolerant to linuron as a granular formulation. After application of linuron at 3.4–6.7 kg/ha, phytotoxic residues remained in the soil at sufficient levels to injure seedling Kentucky bluegrass for up to 3 mo.
Canadian Science Publishing
Title: SELECTIVE CONTROL OF ANNUAL BLUEGRASS IN KENTUCKY BLUEGRASS TURF WITH LINURON
Description:
Optimum top growth of annual bluegrass (Pao annua L.
) and Kentucky bluegrass (Poa pratensis L.
) was obtained at 24/12 °C day/night temperature regime in controlled environment studies.
The tolerance of seedling Kentucky bluegrass to linuron [3-(3,4-dichlorophenyl)-1)methylurea] appeared to be greatest at this temperature regime when photoperiods were 16 h in length.
A granular formulation of linuron gave excellent control of annual bluegrass in Kentucky bluegrass turf at 6.
7 kg/ha when applied postemergence.
At this rate, all culitivars of Kentucky bluegrass tested, with the exception of Fylking, were tolerant to linuron as a granular formulation.
After application of linuron at 3.
4–6.
7 kg/ha, phytotoxic residues remained in the soil at sufficient levels to injure seedling Kentucky bluegrass for up to 3 mo.
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