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Poast Ultra: sethoxydim

Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 21 January 2008
Pub 75: Guide to Weed Control > Notes on Herbicides > Poast Ultra: sethoxydim
Excerpt from Chapter 4, Publication 75, Guide to Weed Control, Order this publication
Trade Names
Poast Ultra
Formulation EC
Guaranteed active concentration 450 g/L
Groups  1
Ontario Schedule 3
Winter Storage B
Chemical Family Cyclohexanedione
Crop and/or Non-Crop Registrations Canola (rapeseed), flax, soybeans, , a number of different edible bean market classes, refer to Table 7-1, for specific crop registrations peas, onions, tomatoes, potatoes, sweet potato, pumpkin, squash, cucumbers, alfalfa, buckwheat, creeping red fescue, garlic, broccoli, cabbage, cauliflower, peppermint, spearmint, snow peas, apples, apricots, cherries, peaches, pears, plums, highbush blueberries, cranberries, strawberries and sethoxydim-resistant corn.
Sensitive Weeds Annual grasses (wild oats, foxtails, barnyard grass, large crab grass, proso millet, fall panicum and witch grass), volunteer corn and cereals and quack grass.
Uptake and Translocation Absorbed by foliage. Translocated upwards and downwards in plant.
Basis of Selectivity  Degraded by tolerant species (broadleaf plants).
Application Methods Postemergence to actively growing annual grasses in the 1- to 6-leaf stage and quack grass in the 1- to 3-leaf stage. Use flat fan nozzles and add Merge adjuvant to the spray mix. Alternatively, Assist Oil Concentrate or Ammonium sulphate plus Assist oil concentrate may be used. Other postemergence herbicides that are not recommended as tank mix combinations on the label must be applied at least 4 days before or after sethoxydim application. Aerial application is also registered.
Residual Activity Essentially none. A second application and/or cultivation may be necessary to control grasses that emerge after treatment.
Unique Characteristics Susceptible grasses, when sprayed, stop growing immediately and then gradually turn yellow to purple to brown over a period of 7-21 days, depending on growing conditions and crop competition. Rainfall within 1 hour after application may reduce effectiveness. If treated grasses are stressed (drought, flooding, prolonged cool temperatures) control will be delayed or reduced.
Manufacturer / Registrant BASF Canada Inc.

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