General Information


FORZA SILVICULTURAL HERBICIDE is a non-selective, non-residual herbicide containing 360 g/L glyphosate (acid equivalent) as isopropylamine salt, formulated as a water soluble liquid. This product controls or suppresses listed undesirable vegetation species, at the appropriate rates, in conifer and deciduous release programs, as well as other forestry sites. The product is absorbed through the foliage and translocates throughout the plant down to the root system. Visible symptoms, such as gradual wilting and yellowing, are usually obvious within 2 to 4 days of application to annual weeds, but may not be apparent for 7 to 14 days on perennial weeds and woody brush. Refer to Section 11 of the label for a list of the undesirable vegetation that is controlled by this product.

Avoid contact with foliage, green stems or fruit of non-target crops, since damage to these crops may result. Apply as directed.

FORZA SILVICULTURAL HERBICIDE is applied as a foliar spray for the control of most herbaceous plants. It may be applied through most standard industrial or field type sprayers after dilution and thorough mixing with water in accordance with the label instructions.

FORZA SILVICULTURAL HERBICIDE may be applied utilizing air, ground boom or boomless, wiper or injection application equipment for the control of vegetation in conifer release, site preparation, and rights of way management. For deciduous release, forest roadside vegetation management and forest tree planting nurseries apply FORZA SILVICULTURAL HERBICIDE utilizing ground spray, wiper or injection application equipment.

Application should be made when vegetation has emerged to the stages described for control of such vegetation to provide adequate leaf surface to receive the spray. Unemerged plants arising from underground rhizomes or rootstocks of perennials will not be affected by the spray and will continue to grow.

Extremely cool or cloudy weather at treatment time may slow down activity of this product and delay visual effects or control. Visible effects are a gradual wilting and yellowing of the plant, which advance to complete browning of above ground growth and deterioration of underground plant parts.

Best control of most perennial herbaceous vegetation is obtained when treatment is made at late growth stages approaching maturity. Do not apply in autumn after leaf drop has started. Always use the higher rate of this product per hectare within the recommended range on hard to control species or when vegetation growth is heavy or dense.

Heavy rainfall immediately after application may wash the chemical off the foliage and a repeat treatment may be required. Do not apply if rainfall is forecast for the time of application.

Do not treat weeds and herbaceous species under poor growing conditions such as drought stress, disease or insect damage, as reduced weed control may result. Reduced results may also occur when treating weeds heavily covered with dust. FORZA SILVICULTURAL HERBICIDE does not provide residual weed control. For best results spray coverage should be uniform and complete. Do not spray weed foliage to the point of runoff.



For ground, aerial or industrial type sprayers, fill the spray tank with one half the required amount of water. Add the proper amount of FORZA SILVICULTURAL HERBICIDE (see Section 9.2 or 13) and mix well before adding the remaining portion of water. Placing the filling hose below the surface of the liquid solution will prevent any excessive foaming. Remove the hose from the tank immediately after filling to avoid back siphoning into water source (a one-way valve should be installed to prevent back siphoning). Use of mechanical agitators may cause excessive foaming. By-pass lines should terminate at the bottom of the tank.


Apply spray solutions in properly-maintained and calibrated equipment capable of delivering desired volumes. Use flat fan nozzles in boom sprayers.

General: To control or suppress most herbaceous weeds, woody brush and trees, apply 3 to 6 litres of this product per hectare using aerial, ground boom, boomless, mist blower equipment, or apply as a 1 to 2% solution using hand-held high volume equipment.

Site preparation: For control of perennial herbaceous weeds in site preparation applications using aerial, ground boom or boomless, or mist blower equipment, apply 7 to 12 litres of this product per hectare as directed in the recommended volume of clean water to the foliage or actively-growing vegetation.

Note: For specific rates for wick or wiper applicators, see Section 12.5 of the label. To control perennial weeds, and woody brush and trees as listed, apply FORZA SILVICULTURAL HERBICIDE in 20 to 300 L of water per hectare as a broadcast spray. Use no more than 275 kPa pressure. To control annual weeds as listed, apply FORZA SILVICULTURAL HERBICIDE in 20 L to 100 L of water per hectare as a broadcast spray. Use no more than 275 kPa pressure.


Use the recommended rates of this herbicide in 20 to 100 L of water per hectare. As density of vegetation increases, spray volume should be increased within the recommended range to ensure complete coverage. Coarse sprays are less likely to drift, therefore do not use nozzles or nozzle configurations that dispense spray as fine spray droplets. Do not angle nozzles forward into the airstream and do not increase spray volume by increasing nozzle pressure. Ensure uniform application--To avoid streaked, uneven or overlapped application, use appropriate marking devices, or equivalent electronic positioning systems (GPS).

Thoroughly wash aircraft, especially landing gear, after each day of spraying to remove residues of this product accumulated during spraying or from spills.

PROLONGED EXPOSURE OF THIS PRODUCT TO UNCOATED STEEL SURFACES MAY RESULT IN CORROSION AND POSSIBLE FAILURE OF THE PART. LANDING GEAR IS MOST SUSCEPTIBLE. The maintenance of an organic coating (paint) which meets aerospace specification MIL-C-38412 may prevent corrosion.


FOR CONTROL OF HERBACEOUS WEEDS AND WOODY BRUSH AND TREES LISTED IN SECTION 11 ON THE LABEL USING CONVENTIONAL BOOM EQUIPMENT -- Apply this product in 100 to 300 L of clean water per hectare as a broadcast spray using no more pressure than 275 kPa.


FOR CONTROL OF HERBACEOUS WEEDS, WOODY BRUSH AND TREES LISTED IN SECTION 11 ON THE LABEL USING BOOMLESS EQUIPMENT SUCH AS CLUSTER NOZZLES -- Apply this product in 100-350 L of clean water per hectare as a broadcast spray using no more pressure than 275 kPa.


High-volume spraying utilizes handguns or other suitable nozzle arrangements to apply a directed spray to weeds, woody brush and trees. Use coarse sprays only. Avoid spraying desirable plants. Mixing: Mix the proper amount of FORZA SILVICULTURAL HERBICIDE with water in a large container. Fill the sprayer with the mixed solution. Unless otherwise stated, make a 1% solution in water (1 L of FORZA SILVICULTURAL HERBICIDE in 100 L of water). A 2% solution (2 L in 100 L of water) should be used on harder to control perennials.

Application: Spray coverage should be uniform and complete. Apply on a spray-to-wet basis. Do not spray to the point of runoff. Hand gun application should be properly directed to avoid spraying desirable plants.


These applicators apply FORZA SILVICULTURAL HERBICIDE solution directly onto the weeds by contacting the weed with an absorbent material containing the herbicide solution. The weeds must be above any desired vegetation to prevent contact with the desired vegetation.

Mixing: Mix the proper amount of FORZA SILVICULTURAL HERBICIDE with water in a large container. Use this mixed solution in the wiper, wick or roller equipment.


FOR CONTROL OF HERBACEOUS WEEDS, WOODY BRUSH AND TREES LISTED IN SECTION 11 ON THE LABEL--Use the recommended rate of this product in at least 200 L of water per hectare.

Limitations, Restrictions, and Exceptions


Ground/aerial application for sites greater than 500 ha (forestry use)

Aerial application for sites 500 ha or less (woodlands use)

NOTICE TO USER: This control product is to be used only in accordance with the directions on the label. It is an offense under the Pest Control Products Act to use a control product under unsafe conditions.

NATURE OF RESTRICTION: This product is to be used only in the manner authorized; consult local pesticide regulatory authorities about use permits which may be required. Do not apply to any body of water populated with fish or used for domestic purposes. Do not use in areas where adverse impact on domestic water or aquatic species is likely. In order to reduce the drift hazard to non-target plants and aquatic species when aerially treating silvicultural sites, ensure that appropriate buffer zones are maintained.

Conifer Release

Use this product as a broadcast spray at recommended rates, as listed in Section 9, to control herbaceous weeds, woody brush and tree species, as listed in Section 11 of the label.

For conifer release of spruce seedlings in the year of transplanting, apply 2 to 6 litres of this product per hectare in plantations of summer planted spruce species (Picea glauca, P. engelmanii and their hybrids). Conifers must be planted in the same year as treatment and in the field for at least 18 days prior to treatment. Seedlings to be treated must clearly show bud set and bud hardening following a dormancy induction regime in the nursery. The need for such early release treatments is expected on sites that are subject to the rapid development of herbaceous and shrub communities. Most annual and perennial weeds will be controlled or suppressed. Applications must be made after formation of final conifer resting buds. Applications made during periods of active conifer growth may result in conifer injury. Avoid application during lammas or late-season conifer growth. Some autumn colour is acceptable provided no major leaf fall has occurred on undesirable brush and tree species. For conifer elease, apply where conifers have been established for more than a year. Vegetation should not be disturbed immediately prior to treatment or until visual signs appear after treatment. Symptoms of treatment are slow to appear, especially in woody species treated in late fall. Injury may occur to conifers treated for release, especially where spray patterns overlap or the higher rates are applied, or when applications are made during periods of active conifer growth.

NOTE: This product is not recommended for use as an over-the-top broadcast spray in forest tree nurseries or in Christmas tree plantations. Applications in such sites should be limited to directed sprays (see DIRECTED SPRAY APPLICATIONS in Section 12.3). DO NOT TREAT Christmas tree plantations in the year of anticipated harvest.

Apply spray to achieve uniform and complete coverage of the leaves and green stems. Do not spray to the point of runoff. Do not allow spray drift to contact non-target desirable vegetation as severe damage may occur.

For perennial broadleaf weeds, apply when most weeds have reached early head or early bud stage of growth. For annual and perennial grasses, apply when most weeds are at least 20 cm in height (the 3-4 leaf stage of growth). If herbaceous weeds have been mowed, tilled, or scarified, do not treat until regrowth has reached the recommended stages, as reduced effectiveness will result. Most herbaceous weeds can be treated after a mild frost, provided the leaves are still green and actively-growing at the time of application. Do not apply after the first damaging frost. Allow 7 or more days after application before tillage or other soil disturbance. Repeat treatments may be necessary to control weeds regenerating from underground parts or seed.