There are many weed management scenarios that have gone astray this spring in tomato fields. Here are some suggestions from Dr. Darren Robinson, Weed Management Researcher at Ridgetown Campus.
- If you have a field that hasn’t been planted yet, the herbicide has already been applied, and the weeds are big: Apply a non-selective, non-residual herbicide like glyphosate, especially if you aren’t going to work the field again before planting.
- If the field has been planted and the weeds are getting too big for some POST sprays: This is a difficult scenario because there are simply no solutions other than hand-weeding or tillage between the rows, and then resuming the spray program to control smaller weeds.
- With metribuzin (Sencor): Wait 3-4 days after an extended period of cloudy weather before applying metribuzin to tomatoes.
- Plants that are stressed due to saturated soils or being held in the greenhouse: Use micro-rates of metribuzin (Sencor) and use Prism, rather than Pinnacle. (Note: Micro-rates of Sencor are 120 ml/ac of the flowable formulation, or 80 g/ac of the dry formulation.)
Always read and follow label directions.