Herbicide Residue Drift Injury - Canola Council of Canada

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16 GROUP 2 Residue Symptoms on Cotyledons The information in this section shows canola injury symptoms associated with Group 2 herbicide residues. Photographs were generated from field plots and bioassays. Field plots were sprayed with reduced rates of Group 2 herbicides prior to planting the crop to simulate herbicide carryover. Group 2 Residue Symptoms on Cotyledons Severe injury symptoms such as purpling or chlorosis, severe size reduction or thickening of cotyledon leaves and petioles often appear at the cotyledon stage. However, cotyledon symptoms must be verified by damage to true leaves and/ or meristems to eliminate cold stress as a cause for symptoms. Plants with mild injury to true leaves do not show injury to cotyledons. Plants with this severity of cotyledon injury are unlikely to form true leaves, mature and flower. A 2-leaf seedling with normal cotyledons (A) and a severely affected seedling (B) at the same age. A B
An unaffected (left) and severely affected cotyledon (right) (A). The affected plant had purpling on the back of the cotyledons, but no size reduction. Inspection of the true leaves of these same plants (B) reveals symptoms consistent with Group 2 herbicide injury. The injured plant (right) has reduced leaf area, is chlorotic and is more cupped than the check plant (left). While short term cold events produce cotyledon injury, they do not reduce true leaf area. A B Recognizing Herbicide Residue and Drift Injury in Canola 17
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: These plants also exhibit symptoms
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 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
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Herbicide Residue Drift Injury - Canola Council of Canada

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