Experiment 1 sprayed on June 23, 2006, to evaluate injury symptoms of herbicides applied mid season.
Herbicide treatments were applied directly on grape foliage.
Treatments were sprayed at 20 gpa with a 4-nozzle boom that sprays a 5.5 ft
band.
Injury ratings and photos were taken at 3, 7, 10, and 33 days after application.
1X rate = the low end of the recommended application range as specified
in each label respectively, except for Banvel and 2,4-D amine, which
were sprayed at much lower rates.
Click on the highlighted injury symptoms below to view pictures of the injury description and its severity.
Agronomic Herbicides Not Labeled on Grapes
| 3 DAT | 7 DAT | 10 DAT | 33 DAT | |||
| Rate | X Rate | 6/26/2006 | 6/30/2006 | 7/3/2006 | 7/26/2006 | |
| Roundup WeatherMax 5.5L | 0.01 pt/A | 1/100 X | none | none | none | none |
| Roundup WeatherMax 5.5L | 0.1 pt/A | 1/10 X | none | none | none | major leaf deformation |
| Roundup WeatherMax 5.5L | 0.5 pt/A | 1/2 X | none | minor leaf burn | minor leaf burn | major leaf deformation |
| Gramoxone Inteon 2E | 0.03 qt/A | 1/100 X | none | none | none | none |
| Gramoxone Inteon 2E | 0.3 qt/A | 1/10 X | minor leaf burn | minor leaf burn | minor leaf burn | none |
| Gramoxone Inteon 2E | 1.5 qt/A | 1/2 X | minor leaf burn | minor leaf burn | see 0.3 qt/A | major leaf burn. plants not dead |
| Callisto 4SC | 0.03 fl.oz./A | 1/100 X | none | none | minor spot burn | none |
| Callisto 4SC | 0.3 fl.oz./A | 1/10 X | none | none | minor leaf yellowing | none |
| Callisto 4SC | 1.5 fl.oz./A | 1/2 X | none | none | minor leaf yellowing | minor leaf yellowing |
| Balance 4SC | 0.03 fl.oz./A | 1/100 X | none | none | minor leaf yellowing | none |
| Balance 4SC | 0.3 fl.oz./A | 1/10 X | none | none | none | none |
| Balance 4SC | 1.5 fl.oz./A | 1/2 X | none | none | none | major leaf yellowing and cupping |
| Dual II Magnum 7.6EC | 0.013 pt/A | 1/100 X | none | none | none | none |
| Dual II Magnum 7.6EC | 0.13 pt/A | 1/10 X | none | none | none | none |
| Dual II Magnum 7.6EC | 0.66 pt/A | 1/2 X | none | none | none | none |
| Aatrex 4F | 0.01 qt/A | 1/100 X | none | none | none | none |
| Aatrex 4F | 0.1 qt/A | 1/10 X | none | none | none | none |
| Aatrex 4F | 0.5 qt/A | 1/2 X | none | none | minor leaf yellowing | minor leaf yellowing |
| Garlon 4EC | 0.02 pt/A | 1/100 X | none | none | none | none |
| Garlon 4EC | 0.2 pt/A | 1/10 X | none | none | leaf desiccation | total death |
| Garlon 4EC | 1 pt/A | 1/2 X | none | none | leaf desiccation | total death |
| Banvel 4EC | 0.0012 fl.oz./A | 0.000075 X | none | none | none | none |
| Banvel 4EC | 0.012 fl.oz./A | 0.00075 X | none | none | none | none |
| Banvel 4EC | 0.12 fl.oz./A | 0.0075 X | none | none | none | none |
| 2,4-D Amine 4L | 0.0016 fl.oz./A | 0.0001 X | none | none | none | none |
| 2,4-D Amine 4L | 0.016 fl.oz./A | 0.001 X | none | none | none | none |
| 2,4-D Amine 4L | 0.16 fl.oz./A | 0.01 X | none | none | none | none |