Introduction

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• Fall Incorporated Application: Fortress MicroActiv must be applied after September 15 and before soil freeze-up.
Application prior to September 15 may result in reduced weed control. Initial incorporation may be completed within
24 hours of application. The second incorporation may be done in the fall (prior to soil freeze-up) or in the spring
prior to, or after, seeding. If performed after seeding, it must be completed with harrows prior to emergence of the
crop. Fall incorporation is not recommended on soils where a lack of crop residue cover combined with the required
incorporation operation could result in soil erosion.
• Spring Application: Fortress MicroActiv can be applied before seeding but must be incorporated within 24 hours of
application. The second incorporation must be delayed at least 48 hours after the first and may be performed at any
time prior to crop emergence.
• Incorporation:
º Fortress MicroActiv applications require two incorporations, with the second incorporation at right angles to the
first. Seeding with a seeder that provides soil disturbance equivalent to a cultivator may replace one incorporation.
Incorporate to a maximum depth of 2 inches (5 cm) by setting disk or cultivator implements to cut a maximum of 3
inches (7.5 cm) into the soil.
º Mixing the product to greater depths will dilute the herbicide, decrease wild oat control, and may cause injury to
cereals. If the second incorporation is conducted after seeding, it should be done with harrows or other suitable
tillage equipment adjusted so as not to disturb the seed. Harrowing does not provide effective in-corporation if
compact soil prevents penetration of harrow teeth, if crop residue accumulates in the harrow sections, or if the
harrows bounce.
• Seeding Requirements: Accurate seeding depth control is critical. Thinning of wheat and barley has been known
to occur when seeding depth has been inadequate. Ensure that cereals are seeded below the treated layer (2 to
3 inches or 5 to 7.5 cm). Do not seed deeper than 3 inches (7.5 cm). To ensure an even crop stand, increase the usual
seeding rate of wheat or barley by 10 percent, especially if soil conditions are cold or dry. See product label for more
information.
How it Works:
Refer to Table 9 on page 48.
Effects of Growing Conditions:
Crop injury can occur on fields where Fortress MicroActiv has been applied and heavy rainfall or cold weather occur after
seeding but prior to crop emergence. Seeding under warm soil conditions (greater than 10 o C and generally after May 15)
will ensure optimum crop germination and emergence and will reduce the risk of crop injury. Very dry conditions in spring
or prolonged cool soil temperatures at time of wild oat germination will result in reduced control.
Poor results may be expected from incomplete incorporation due to wet, cloddy soil or heavy crop residues. Ridges left at
seeding may disrupt the treated layer and allow weed escapes.
Restrictions:
• Rainfall: Moisture is required for activation. Rainfall of at least 0.6 inches (1.5 cm) within 2 weeks of seeding is required
to ensure optimum results.
• Re-entry Interval: DO NOT enter treated fields for at least 12 hour
• Grazing Restrictions: DO NOT graze or cut treated crops for livestock feed prior to crop maturity.
• Re-cropping Interval: Fortress MicroActiv will leave a residue in the soil. Oats, canaryseed, and small seeded forage
grasses may be injured if planted within 24 months of application. DO NOT apply on land to be sown to wheat if the
land has been treated with trifluralin since June 1 of the previous year.
• Aerial Application: May be applied by airplane with attachments designed for applying low volumes of granules.
Hazard Rating:
Warning – contains the allergen soy.
May cause Skin and Eye Irritation
For an explanation of the symbols used here see page 4.