Introduction

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Weeds and Staging:
Apply prior to the emergence of weeds. Weeds that have emerged prior to application will not be controlled.
º Barnyard grass
º Buckwheat
º Foxtail (green, yellow)
º Lamb’s-quarters
º Nightshade (American,
Eastern black)
º Pigweed (prostrate,
redroot)
* Herbicide must be incorporated for best control.
Rates:
º Purslane
º Ragweed
º Smartweed
(lady's-thumb)
Weed Populations Rate (L per acre) Acres Treated per 14 L Container
Light infestations 1.2 11.7
Medium infestations 1.4 10
Heavy infestations 1.6 8.8
DO NOT apply Primextra II Magnum to:
• soils with less than 1% organic matter content
• soils with more than 10% organic matter content.
Application Information:
º Wild mustard
º Witch grass
º Yellow nutsedge*
• Water Volume: 61 L per acre
• Pressure: 30 to 45 psi (200 to 300 kPa).
• Nozzles: Flat fan with
• Screens: Use 50-mesh nozzle and main plumbing screens.
• Incorporation:
º Incorporate using S-tine or C-tine cultivators or tandem disk. DO NOT incorporate deeper than 4 inches (10 cm).
º To ensure that the product remains in the top 2 inches (5 cm) of soil, apply to a firm seedbed free of large clods or
lumps. If using tandem disks, set disks to work the soil at a depth of 4 inches (10 cm) and operate at a speed of
6 km/hr (4 mph). If using an S-tine cultivator, set the implement to work the soil to a depth of 4 inches (10 cm) and
operate at a speed of 10 km/hr (6 mph).
How it Works:
Refer to Table 9 on page 48.
Effects of Growing Conditions:
Extended periods of dry soil conditions may result in reduced weed control. Moderate rainfall (0.5 inch) after application
will enhance activity. Heavy rainfall following application of Primextra II Magnum may dilute the metolachlor deeper than
2 inches (5 cm) and result in reduced weed control, particularly on light textured soils.
Tank Mixes:
Herbicides: None registered.
Fertilizers: May be tank mixed with liquid fertilizer for pre-plant incorporated applications. Conduct a compatibility test by
performing a jar test prior to mixing the products in the tank. May be impregnated onto dry bulk fertilizers (except nitrate
or superphosphate fertilizers or limestone).
Note: The above mixes are those listed on the Primextra label only.
Adding ingredients in the correct order is critical for optimum performance. Check labels of both products to be mixed for
directions. General guidelines can be found on page 8.