Herbicide Residue Drift Injury - Canola Council of Canada

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32 Residual Effects of Group 5 and 14 Herbicides Residual Effects of Group 5 and 14 Herbicides Group 5 herbicides include the triazine type photosynthetic inhibitors of which Sencor is the product most likely of concern for residue issues in canola crops. Symptoms can include wilting and yellowing of oldest leaves, followed by plant death in severe cases. For a list of Group 5 actives and products and more details on mode of action, see page 58 under foliar injury symptoms. Group 14 herbicides may be soil active (Authority) or foliar active (Cleanstart) or both (Heat), and result in membrane disruption and desiccation. Group 14 Herbicides Chemical Family Active Ingredient Found In: Aryl Triazone Carfentrazone Cleanstart Flumioxazin Saflufenacil Sulfentrazone Payload, Valtera Eragon, Heat WG Authority Always confirm active ingredients and recropping restrictions on product labels prior to use. • Symptoms include yellow and desiccated leaves. • Seedlings can show bleaching and yellowing symptoms. • Seedlings usually die prior to or shortly following emergence.
Conclusion Herbicide carryover can cause significant yield loss and maturity delay. Carryover symptoms can be confused with symptoms caused by nutrient deficiency or cold stress. However, causes for symptoms can be differentiated by: 1) soil tests (nutrients), 2) climatic observation (cold temperature), and 3) soil chemical analysis for the presence of herbicide residue (see Appendix 1 on page 34). When carryover is possible or suspected, check fields at early leaf stages and record (e.g., photographs) symptoms and recovery. Labs that offer soil test for herbicide residue: A&L Laboratories London, Ontario Toll-free: 1-855-837-8347 Website: www.alcanada.com AGAT Labs Calgary, Alberta Toll-free: 1-800-661-7174 Website: www.agatlabs.com/agri-foods/ agricultural-analysis/index.cfm ALS Centre of Excellence Edmonton, Alberta Phone: 780-391-2300 Website: http://alsglobal.com/ environmental/services/north-americaenvironmental-services/canada.aspx Exova Edmonton, Alberta Phone: 780-438-5522 Website: www.exova.ca Recognizing Herbicide Residue and Drift Injury in Canola 33
Page 1 and 2: Recognizing Herbicide Residue Drift
Page 3 and 4: Foliar Herbicide Injury Introductio
Page 5 and 6: Recropping Restrictions for Residua
Page 7 and 8: Herbicide Clearfield Canola Non-Cle
Page 9 and 10: Table 1: Soil factors that effect t
Page 11 and 12: Carryover can have considerable fie
Page 13 and 14: In this case, cupping was caused by
Page 15 and 16: These plants also exhibit symptoms
Page 17 and 18: An unaffected (left) and severely a
Page 19 and 20: An unaffected plant (left) and one
Page 21 and 22: Severe Symptoms At the 3-leaf stage
Page 23 and 24: Severe Symptoms Leaf purpling and c
Page 25 and 26: Severe Symptoms The combination of
Page 27 and 28: Recognizing Herbicide Residue and D
Page 29 and 30: Symptoms observed at this stage are
Page 31: Chemical Family Active Ingredient F
Page 35 and 36: Recognizing Herbicide Residue and D
Page 37 and 38: OBJECTIVES AND METHODS This section
Page 39 and 40: Chemical Family Active Ingredient F
Page 41 and 42: Sulfosulfuron symptoms: 2% of an 11
Page 49 and 50: Imazethapyr and Imazamox symptoms:
Page 51 and 52: Imazethapyr and Imazamox symptoms:
Page 53 and 54: Chemical Family Active Ingredient F
Page 55 and 56: 2,4-D Ester 600 symptoms: 5% of a 2
Page 57 and 58: 2,4-D Ester 600 symptoms: 10% of a
Page 59 and 60: Effects of Foliar-Applied Group 6 H
Page 61 and 62: Effects of Foliar-Applied Group 9 G
Page 63 and 64: Effects of Foliar-Applied Group 14
Page 66: Canola Council of Canada 400 -167 L

Herbicide Residue Drift Injury - Canola Council of Canada

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