K.V. McCully1, M.J. Melanson1 and C. Morales1
(Partner: New Brunswick Wild Blueberry Growers Association)
Abstract: A trial to evaluate 4 simazine (Princep Nine-T) rates, 1 atrazine (Aatrex Nine-O) rate , 1 terbacil (Sinbar 80 WP) rate, and 3 reduced rates of hexazinone (Velpar 75DF) for weed control in wild blueberry fields was conducted in the Tracadie area of NB in 1997. Visual ratings on crop injury, poverty oatgrass (Danthonia spicata) and goldenrod control were collected. Results indicated that blueberry plants were very tolerant to all the herbicides and rates evaluated, as injury levels never exceeded 3% at any time throughout the season. Sinbar, and all three rates of Velpar 75DF (1.33; 2.0; 2.67 kg/ha) were the only treatments which provided excellent poverty oatgrass control (100%) by the final rating (Oct. 2). Only the three Velpar treatments provided excellent goldenrod control (100%). The lowest Velpar 75DF rate (1.33kg/ha) was suffice to provide season long control of both goldenrod and poverty oatgrass. Data should also be collected in the fruiting year to determine how effective the treatments are in providing long term control.
1Potato & Horticulture Branch, NBDARD, Fredericton, NB E3B 5H1