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Shotgun: atrazine/2,4-D

Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 21 January 2008
Pub 75: Guide to Weed Control > Notes on Herbicides > Shotgun: atrazine/2,4-D
Excerpt from Chapter 4, Publication 75, Guide to Weed Control, Order this publication
Trade Names Shotgun
Formulation Su 
Guaranteed active concentration 390 g/L 
Groups  4, 5 
Ontario Schedule 2
Winter Storage A
Chemical Family Triazine/phenoxy
Crop and/or Non-Crop Registrations Field corn
Sensitive Weeds Lady's-thumb, lamb's-quarters, wild mustard, redroot pigweed, common ragweed, velvetleaf, wild buckwheat; tankmix with pendamethalin+rimsulfuron, nicosulfuron, rimsulfuron or nicosulfuron/rimsulfuron for control of barnyard grass, green foxtail and yellow foxtail; tankmix with rimsulfuron or nicosulfuron/rimsulfuron for control of fall panicum.
Uptake and Translocation Both components may be taken by either roots or shoots, but the atrazine will primarily be absorbed by the roots and travel in the transpiration stream, while the 2,4-D will primarily be absorbed by the shoots and move in the phloem.
Basis of Selectivity  See notes on 2,4-D and atrazine 
Application Methods Postemergence 
Residual Activity Injury may occur if land treated with atrazine/2,4-D is planted to any crop other than corn in the same season. Sensitive crops such as tobacco and sugar beets should not be planted in the year following treatment. When extended periods of dry weather occur during the year of treatment, there can be some injury to succeeding crops such as white beans, onions, peas, tomatoes and turnips. Injury is most likely to occur when the seedling crop is subjected to periods of stress, e.g., during periods of abnormally hot, dry weather.
Unique Characteristics See the 2,4-D note for information about spray and vapour drift. See also "Notes on atrazine and simazine soil residues" in "Special notes for Corn".
Manufacturer / Registrant  United Agri Products

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