Introduction

301
• Re-cropping Interval:
º Caution:
º Metsulfuron residues can persist for long periods, potentially limiting re-cropping options. Degradation of
metsulfuron is dependent on the pH, moisture, and temperature of the soil. Refer to the label for details on
rotation and minimum re-cropping intervals.
º Refer to table below. The following re-cropping intervals, based on soil pH, should be considered as guidelines
only. Metsulfuron residues may affect crops for a longer period of time than outlined in the following table. Add
12 months to recommendations if less than 5 inches (130 mm) of rainfall in brown and dark brown soils or less
than 10 inches (250 mm) rainfall in black or grey wooded soils in any year following application.
Minimum Re-Cropping Interval (Months)
Soil PH
Barley,
Wheat
Oat* Canola* Flax* Lentils Canary-
Seed
Yellow
Mustard
less than 10 10 10 (22) 10 (22) 34 48 48
7.0
7.0 -7.9 10 10 (22) 22 (34) 34 48 48 48
* Figures in brackets refer to re-cropping intervals in brown and dark brown soil zones.
º ALL OTHER DATA refer to re-cropping intervals in all soil zones. On black and grey wooded soils with pH of
7.5 or less, fescue may be planted 10 months after application and alfalfa, red clover, peas and flax may be
planted 22 months after application. DO NOT use on soils with pH greater than 7.9.
º Effects of metsulfuron residues on crops other than those listed in the table have not been fully evaluated.
Because of the length of re-cropping restrictions and the lack of information on many rotational crops,
metsulfuron is not recommended for use on farms where special crops are grown (such as faba beans, beans,
sunflowers, buckwheat, corn, potatoes, sugar beets, etc.).
• Aerial Application: DO NOT apply by air.
• Storage: Store in a cool, dry place. May be frozen.
• Buffer Zones:
º Handheld or backpack applications do not require a buffer.
Weed Control
Use
Buffer Zones (metres † ) Required for the Protection of:
Aquatic Habitats of Depths
Terrestrial habitat**
Less than 1 m
Greater than 1 m
Cropland 1 1 15
See page 35 for an explanation of the different habitats.
* Buffer zones can be reduced by 70% when using shrouds and by 30% when using cones mounted less than
12 inches from the crop canopy.
** Terrestrial buffers are not required for transport and utility rights of way
†
Distance measured as metres from the downwind edge of the spray boom to sensitive habitat.
Sprayer Cleaning:
Metsulfuron can cause severe injury to sensitive crops at very low concentrations. Sprayers used to apply metsulfuron
should be flushed out immediately after metsulfuron is used. Refer to ‘Method B’ found in the general sprayer cleaning
section on page 9 and 10. All nozzles, screens and filters should be removed and cleaned after applying this product.
Hazard Rating:
Caution – Poison
Caution – Eye Irritant
For an explanation of the symbols used here see page 4.