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Firstrate: cloransulam-methyl

Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 21 January 2008
Pub 75: Guide to Weed Control > Notes on Herbicides > Firstrate: cloransulam-methyl
Excerpt from Chapter 4, Publication 75, Guide to Weed Control, Order this publication
Trade Names
FirstRate
Formulation WG
Guaranteed active concentration 84%
Groups  2
Ontario Schedule 2
Winter Storage C
Chemical Family Triazolopyrimidine sulfonanilide.
Crop and/or Non-Crop Registrations Soybeans
Sensitive Weeds Common ragweed, giant ragweed, cocklebur, velvetleaf, and jimsonweed.
Uptake and Translocation Absorption by roots, shoots and foliage. Translocation via the xylem and phloem and accumulation in the growing points.
Basis of Selectivity  Metabolism by soybeans. Inhibition of the acetolactase synthase (ALS) enzyme in susceptible plants followed by a rapid cessation of cell division and plant growth.
Application Methods Preemergence in both conventional and conservation tillage systems or postemergence prior to the flowering stage of soybeans.
Residual Activity Decomposition in soils is attributed primarily to microbial degradation. Some rotational cropping restrictions apply. Refer to Table 4-3 and Table 4-4, Herbicide Crop Rotation and Soil pH Restrictions for additional information.
Unique Characteristics Do not apply to peat or muck soils. Preemergence or postemergence applications require an activating rainfall that moistens the soil to a depth of at least 5 cm in order to move FirstRate into the weed germination zone. If adequate rainfall is not received within 7-10 days after application, a shallow cultivation or use of a rotary hoe is recommended. Do not apply when air temperature is near freezing or when freezing conditions are expected for several days following time of application. Extended cold, wet conditions or abnormally high soil moisture conditions during emergence and early crop development may cause injury symptoms on soybeans such as temporary yellowing of the leaves and/or crop stunting. Soybeans will quickly outgrow these symptoms once normal growing conditions resume. Postemergence application prior to full emergence of the first trifoliate leaf may cause temporary yellowing of soybeans. This effect is transient and has no effect on soybean yields. Postemergence application requires the addition of a non-ionic surfactant (Agral 90) and a liquid ammonium fertilizer (28-0-0 or 32-0-0). See label for details.
Manufacturer / Registrant Dow Agrosciences Canada Inc.

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