K. V. McCully1 and M.J. Melanson1
(Partner: Horticultural Producers Association of Southern New Brunswick)
Abstract: The second year of a trial to evaluate Lexone 75DF (metribuzin) at various rates (0.33 kg/ha, 0.66 kg/ha, 0.2 kg/ha multiple applications); timings (ppi, pre, post); and application methods (post emergent - over the top; post emergent - directed to bottom third of tomato plant) was conducted on fresh market tomatoes (cv Mountain Fresh) to evaluate tomato tolerance and weed control. Visual ratings on tomato injury, lamb?s quarters control, barnyard grass control, and common ragweed control were collected throughout the summer. Yields were also collected through seven different harvests. Results indicated that Mountain Fresh tomatoes appear very tolerant to Lexone 75DF regardless of rate, application timing, or method of application (i.e. overtop or directed). All treatments provided effective lamb?s quarters, barnyard grass, and ragweed control by season end. The higher Lexone 75DF rate ( 0.66 kg/ha) provided only slightly higher weed control than the lower rate (0.33 kg/ha) on the evaluated weeds. Based on yields, the most effective treatment was Lexone 75DF applied at 0.66 kg/ha ppi. This supports the conclusions from last years trial as well.
1Potato and Horticulture Branch, NBDARD, Fredericton, NB E3B 5H1