Herbicide Residue Drift Injury - Canola Council of Canada

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34 Appendix 1 Chemical Testing vs. Plant Bioassay Determining if residues are present is important for pre-plant risk assessment and confirmation of herbicide injury already observed in the field. This can be accomplished with a plant bioassay, chemical analysis or both. Both methods rely on appropriate soil sampling and have advantages and disadvantages. While bioassay is the most accurate method for confirming that a field is safe for growing sensitive crops like canola, currently we are unaware of any commercial labs offering the service. Results should be interpreted in conjunction with: 1) Label recommendations 2) Soil pH and organic matter 3) Herbicide field history 4) Precipitation What it does Chemical Analysis Detects concentration of extractable herbicide in soil (ng/g, ppm, ppb). Plant Bioassay Determines potential level of biological activity. Pros Fast results. Detects herbicide residues at lower concentrations than chemical analysis. Less expensive than chemical analysis. Cons No indication of biological activity. Takes three to five weeks to get results. Need to know which herbicide to test for. Expensive. Does not test for specific herbicides, only herbicide group. Results take experience or expert advice to interpret.
Recognizing Herbicide Residue and Drift Injury in Canola 35
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 and 32: Chemical Family Active Ingredient F
Page 33: Conclusion Herbicide carryover can
Page 37 and 38: OBJECTIVES AND METHODS This section
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 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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