Herbicide Residue Drift Injury - Canola Council of Canada

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54 Effects of Foliar-Applied 2,4-D Ester 600 and MCPA Amine 40 Effects of Foliar-Applied 2,4-D Ester 600 and MCPA Amine 40 Reduced rates selected for 2,4-D and MCPA were based on full rates of 285 ml/acre and 444 ml/acre respectively. Symptoms were similar for both herbicides and included swelling (stems, petioles and at the crown area), resulting in stem cracking and epinasty (downward curvature of a leaf or stem). Chlorosis on new leaves was produced when swelling or stem cracking was severe enough to interrupt the water and sugar transport within the plant. Stem cracking at the base was more pronounced with 2,4-D than MCPA, whereas stem epinasty was more pronounced with MCPA compared to 2,4-D. 2,4-D Ester 600 symptoms: 5% of 285 ml/acre rate Symptoms were not observed at lower rates for either herbicide. Symptoms appeared six days after spraying and included swelling and epinasty of the stems and/or crown area. This plant is showing swelling above the crown and is starting to crack below the crown area.
2,4-D Ester 600 symptoms: 5% of a 285 ml/acre rate An unaffected plant (left) and sprayed plant (right). Note the lack of leaf symptoms. Epinasty is present only in the crown area. A close-up of the above plants. Recognizing Herbicide Residue and Drift Injury in Canola 55
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 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 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: Chemical Family Active Ingredient F
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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