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Amitrol 240: amitrole

Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 21 January 2008
Pub 75: Guide to Weed Control > Notes on Herbicides > Amitrol 240
Excerpt from Chapter 4, Publication 75, Guide to Weed Control, Order this publication
Trade Names Amitrol 240
Formulation SC
Guaranteed active concentration 231 g/L
Groups  11
Ontario Schedule 2
Winter Storage E
Chemical Family Triazole
Crop and/or Non-Crop Registrations Preplant in wheat, barley, canola, field peas, corn, soybeans and white beans. Postharvest after any crop. In-season weed control in apples. Use in shelterbelts, non-crop areas, marshes and ditches. Spot treatment in pastures.
Sensitive Weeds Many annual and perennial broadleaf weeds and grasses including quack grass, dandelions, Canada thistle, sow-thistle, poison-ivy, poison-oak, toadflax, milkweed, hoary cress, leafy spurge, horsetail, cattail, honeysuckle, locust, ash and sumac.
Uptake and Translocation Absorbed by foliage and roots. Translocates well in xylem and phloem. Accumulates in growing regions of plant.
Basis of Selectivity  Resistant plants metabolize amitrole more rapidly than sensitive plants and may have lower uptake as a result of leaf structure that reduces wetting and penetration.
Application Methods Foliar postemergence application to actively growing plants. Good coverage is essential. If weeds are mature, it is advisable to cut them and then spray the regrowth. Do not disturb treated plants for at least 2 weeks after application. Do not make postharvest application after October 1. For control of quack grass and Canada thistle, apply in spring or fall to actively growing plants 15-20 cm tall: wait 10-14 days and then plough or disk.
Residual Activity Approximately 2-4 weeks in moist, warm soil.
Unique Characteristics Most crops are sensitive if contacted. Poor results may occur if spray coverage is inadequate, if plants are drought stressed or overmature, or if heavy rains fall within 6 hours after application. Do not graze or plant to grain, peas, alfalfa or clover for 8 months after treatment. Do not graze spot-treated areas in pastures for 6 months following treatment.
Manufacturer / Registrant Nufarm Agriculture Inc.

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