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Dual II Magnum: s-metolachlor/benoxacor

Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 21 January 2008
Pub 75: Guide to Weed Control > Notes on Herbicides > Dual II Magnum: s-metolachlor/benoxacor
Excerpt from Chapter 4, Publication 75, Guide to Weed Control, Order this publication
Trade Names
Dual II Magnum
Formulation EC
Guaranteed active concentration 915 g/L
Groups  15
Ontario Schedule 2
Winter Storage B
Chemical Family Acetanilide
Crop and/or Non-Crop Registrations Corn, soybeans, a number of different edible bean market classes, refer to Table 7-1, for specific crop registrations, transplanted cole crops (cabbage, cauliflower, broccoli), transplanted tomatoes, potatoes, sugar beets, processing peas, rutabagas and sweet white lupins, apples, apricots, cherries, peaches, pears and plums.
Sensitive Weeds Large and smooth crab grass; witch grass; barnyard grass; fall panicum; giant, green and yellow foxtail; yellow nut sedge; American nightshade, eastern black nightshade and tall waterhemp.
Uptake and Translocation Absorbed by germinating grasses mainly through shoot just above seed. Absorbed by germinating broadleaf weeds through roots and shoots.
Basis of Selectivity  Metabolized by tolerant species.
Application Methods Early preplant, preplant incorporated and preemergence. Early postemergence on corn (spike to 2-leaf stage of corn). Incorporation equipment should be set to work the soil 10 cm deep with a disc operating at 6-10 km/hr or a vibrating shank cultivator at 10-13 km/hr; one incorporation is sufficient and need not be immediate. Rainfall within 10 days is required for maximum activity of the preemergence application.
Residual Activity Activity will normally be maintained for 10-14 weeks.
Unique Characteristics The rate required depends on weed pressure (higher rate for heavier weed pressure). Yellow nut sedge control requires a preplant incorporated application. Winter cereals may be planted 4-5 months after metolachlor application. Many tank mix combinations are registered on various crops. Do not use on muck soils or coarse-textured soils low in organic matter. Dual II Magnum contains benoxacor, a chemical that enhances the corn plant's ability to metabolize s-metolachlor, thereby preventing corn injury even under adverse environmental conditions.
Manufacturer / Registrant Syngenta Crop Protection Canada Inc.

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