Herbicide Residue Drift Injury - Canola Council of Canada

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18 Group 2 Residue Symptoms on True Leaves Group 2 Residue Symptoms on True Leaves Mild Symptoms Mild injury involves minimal or no damage to the meristem, but can interfere with early leaf development. Mild injury may not produce sufficient symptoms for definite diagnosis until the 3-leaf stage since symptoms may mimic nutrient deficiency or cold stress. Maturity delay can occur with mild injury. Mild symptoms (A) can include mild chlorosis noticeable on the first and second leaves, reduced leaf area and mild cupping of the third leaf. After two weeks, (B) leaf size was normal and no other symptoms were evident. Plant development was delayed by two leaf stages relative to nearby plants. A B
An unaffected plant (left) and one with chlorosis and reduced leaf size (right). The first and second leaves show the initial injury through reduced leaf area and elongated petioles. Petiole elongation is typical of mild injury. Differences between uninjured (left) and injured (right) plants could not be seen until the 3-leaf stage. Recognizing Herbicide Residue and Drift Injury in Canola 19
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: An unaffected (left) and severely a
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 and 34: Conclusion Herbicide carryover can
Page 35 and 36: Recognizing Herbicide Residue and D
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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