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Betasan: bensulide

Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 21 January 2008
Pub 75: Guide to Weed Control > Notes on Herbicides > Betasan
Excerpt from Chapter 4, Publication 75, Guide to Weed Control, Order this publication
Trade Names Betasan, Betasan (GR)
Formulation EC, Gr, EC
Guaranteed active concentration 480 g/L, 12.5%
Groups  8
Ontario Schedule 3
Winter Storage A, C
Chemical Family Benzenesulfonamide
Crop and/or Non-Crop Registrations Lawns, turf and cucumbers.
Sensitive Weeds Germinating annual grasses such as annual bluegrass, barnyard grass, crab grass and foxtail. Some control of redroot pigweed, lamb's-quarters and shepherd's-purse.
Uptake and Translocation Absorbed on root surfaces and a small amount is absorbed by the roots. Little or none is translocated upward to the leaves.
Basis of Selectivity  Inhibits root growth and partially inhibits cell division in sensitive seedlings. Sensitive species affected only in seedling stage. Metabolized by established grasses.
Application Methods Preemergence in spring or fall for turf (well-established only); a higher rate is required for fall applications to control germinating weeds the following spring; incorporate by lightly irrigating into soil.
Residual Activity Season-long weed control. Degraded slowly by soil micro-organisms with a half-life of 4-6 months depending on soil type. Because of soil residues, only cucurbits, cole crops, carrots, lettuce, peppers and tomatoes should be planted the following year.
Unique Characteristics Bensulide is inactivated in soils containing high amounts of organic matter (muck soils). Incorporation recommended to avoid photodecomposition. Do not reseed lawn within 1 year of application. Formulations available with fertilizers for homeowner lawn use.
Manufacturer / Registrant Gowan Company

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