General Information


TopNotch herbicide is intended for preplant, preemergence, or early postemergence use in corn. Use of this product in corn is limited to field corn, production seed corn, silage corn, sweet corn and popcorn. Do not apply this product to any crop other than corn.

TopNotch is a micro-encapsulated combination of the herbicide acetochlor and the antidote or safener dichlormid. While the acetochlor provides weed control, the dichlormid safens corn against herbicide injury. TopNotch may be applied to the surface or incorporated into the top 1-2 inch layer of soil. It is recommended for control alone, or in tank mix combinations as indicated, for the weeds listed in the \"Target Weeds\" section of these use directions. TopNotch controls weeds by interfering with normal germination and seedling development. TopNotch will not control established or germinated weeds present at application.

Use Precautions and Restrictions

- On the following soil types, do not apply this product within 150 feet of any well where the depth to groundwater is 30 feet or less: sands with less than 3% organic matter; loamy sands with less than 2% organic matter; or sandy loams with less than 1 percent organic matter. See the figure for additional clarification.

- Do not apply this product using aerial application equipment.

- Chemigation: Do not apply this product through any type of irrigation system.

- Do not use fiood irrigation to apply or incorporate this product.

- This product may not be mixed or loaded within 50 feet of any wells (including abandoned wells and drainage wells), sink holes, perennial or intermittent streams and rivers, and natural or impounded lakes and reservoirs. This setback does not apply to properly capped or plugged abandoned wells and does not apply to impervious pad or properly diked mixing/loading areas.

- Operations that involve mixing, loading, rinsing, or washing of this product into or from pesticide handling or application equipment or containers within 50 feet of any well are prohibited unless conducted on an impervious pad constructed to withstand the weight of the heaviest load that may be positioned on or moved across the pad.

Such a pad shall be designed and maintained to contain any product spills or equipment leaks, container or equipment rinse or washwater, and rainwater that may fall on the pad. Surface water shall not be allowed to either fiow over or from the pad, which means the pad must be self contained. The pad shall be sloped to facilitate material removal. An unroofed pad shall be of sufflcient capacity to contain at a minimum 110% of the capacity of the largest pesticide container or application equipment on the pad. A pad that is covered by a roof of sufflcient size to completely exclude precipitation from contact with the pad shall have a minimum containment capacity of 100% of the capacity of the largest pesticide container or application equipment on the pad. Containment capacities as described above shall be maintained at all times. The above specifled minimum containment capacities do not apply to vehicles when delivering pesticide shipments to the mixing/loading site. States may have in effect additional requirements regarding wellhead setbacks and operational containment.

- Product must be used in a manner that will prevent back siphoning in wells, spills or improper disposal of excess pesticide, spray mixtures or rinsates.

- Do not apply under conditions that favor runoff or wind erosion of soil containing this product to non-target areas. To prevent off-site movement due to runoff or wind erosion:

- Avoid treating powdery dry or light sandy soils when conditions are favorable for wind erosion. Under these conditions, the soil surface must flrst be settled by rainfall or irrigation.

- Do not apply to impervious substrates such as paved or highly compacted surfaces or frozen or snow covered soils.

- Do not use tailwater from the flrst fiood or furrow irrigation of treated flelds to treat non-target crops unless at least ½ inch of rainfall has occurred between application and the flrst irrigation.

- Do not apply when wind conditions favor drift to non-target sites. To minimize spray drift to non-target areas:

- Use low pressure application equipment capable of producing a large droplet spray.

- Do not use nozzles that produce a flne droplet spray.

- Minimize drift by using sufflcient spray volume to ensure adequate coverage with large droplet size sprays.

- Keep ground-driven spray boom as low as possible above the target surface.

- Make application when the wind velocity favors on-target product deposition (approximately 3 to 10 mph). Do not apply when wind velocity exceeds 15 mph. Avoid application when gusts approach 15 mph.

- Low humidity and high temperatures increase the likelihood of spray drift to sensitive areas. Avoid spraying during conditions of low humidity and/or high temperatures. Do not apply during inversion conditions.

Application Directions – Corn

Application Timing and Methods

For the optimum period of effective weed control during the time most critical to corn production, preplant applications of TopNotch should occur as close as possible to planting. Preemergence applications should occur as close as possible to planting, but prior to weed emergence. Postemergence applications should occur prior to weed emergence or in tank mix combination with a product that controls emerged weeds.

Note: Do not apply TopNotch to sweet corn as an early postemergence application.

Early Preplant: On medium and fine textured soils (see Table 1), TopNotch and certain tank mixtures may be applied up to 40 days before planting.

Preplant Incorporation: TopNotch and certain tank mixes may be mechanically incorporated in the top 2 inches of the soil with field cultivators, discs, or spring tooth harrows at any time within 10 days prior to planting. Do not apply and incorporate more than 10 days prior to planting. Improper incorporation, excessive crop residues, or poor soil tilth may result in erratic, streaked or otherwise unsatisfactory weed control. Do not mix TopNotch deeper than 2” into the soil and avoid moving or shaping soil after incorporation.

Preemergence Surface: TopNotch and certain tank mixes may be applied to the soil surface as a broadcast or banded application. Precipitation or sprinkler irrigation of at least 0.25 inch is required to bring TopNotch into contact with germinating weed seeds. If rain or sprinkler irrigation does not occur within 7 days after application, weed control may be improved by using a rotary hoe, or similar equipment, to incorporate the herbicide. Incorporation equipment should be run at a shallow depth to avoid disturbance of germinating corn seed. Erratic weed control resulting from exposure of untreated soil may occur if surface soil is moved or reshaped after incorporation.

Postplant-Preemergence: TopNotch may be applied immediately after planting but prior to corn emergence. If rain or sprinkler irrigation does not occur within 7 days after application, weed control may be improved by using a rotary hoe, or similar equipment, to shallowly incorporate the herbicide. Incorporation equipment should be run at a shallow depth to prevent disturbance of the germinating corn seed. Erratic weed control resulting from exposure of untreated soil may occur if surface soil is moved or reshaped during incorporation.

Banding Preemergence: TopNotch may be applied in a band treatment after corn planting but prior to corn emergence.

Early Postemergence: TopNotch may be applied early postemergence to corn up to 11\" tall. Applications must be made prior to weed seedling emergence or in a tank mix combination that controls the emerged weeds.

Read and follow restrictions and directions on tank mix product labels.

Sprinkler Irrigation: Do not apply TopNotch by sprinkler irrigation.

Use a sprinkler system only to incorporate TopNotch after application.

After TopNotch has been applied, a sprinkler irrigation system set to deliver 0.25 to 0.75 inch of water per acre may be used to incorporate the product. Using more than 0.75 inch of water could result in reduced performance. On sandy soil low in organic matter, use no more than 0.5 inch of water. Do not use flood irrigation to apply or incorporate TopNotch.

Fall Application - For use in IA; IL (North of Route 136); NE (North of Route 20); MN; ND; SD; WI: Following soybean harvest, apply to soybean stubble after October 15, when the sustained soil temperature at 4-inch depth is less than 50oF, but before ground freezes. Use on medium and fine textured soils with greater than 2.5% organic matter. Only corn may be planted the following spring.

Ground may be tilled before or after application. Do not exceed 2-inch incorporation depth if tilled after application.

If a spring application is made, the total rate of the fall plus spring application must not exceed the maximum labeled rate for corn grown on that soil.


Cultivation should be delayed as long as possible. If weeds develop, a shallow cultivation or rotary hoeing will generally result in improved weed control. If TopNotch was incorporated, cultivate less than one-half the depth of incorporation.

If cultivation is necessary due to soil crusting, compaction, or escaped weeds, adjust equipment to run shallow and minimize soil movement. This will decrease the possibility of diluting or moving the herbicide from the weed control zone.

Soil Texture Groupings

The use rate of TopNotch is determined by a combination of two factors, soil texture and the interval of time between application and planting. Different soil textures are grouped into three textural classes (coarse, medium and fine) as outlined in Table 1. Soil texture may be determined from soil survey information and/or by laboratory analysis, but must be known prior to application in order to select the proper application rate from Table 2.

Refer in the label regarding tank mix information.

Limitations, Restrictions, and Exceptions


Use Rates for TopNotch

Application can take place from up to 40 days before planting. Optimal weed control will be obtained when applications are made as close to planting as possible but before the weeds emerge. In reduced or no-till systems, it is recommended that a burndown herbicide such as paraquat (Gramoxone) or glyphosate (Glyphomax, Roundup or Touchdown) or 2,4-D be tank mixed with TopNotch if emerged weeds are present at application.

On coarse textured soils with less than 3% Organic Matter, the maximum rate is 2.25 qt/acre.

- Use the lower rate when tank mixed with a residual herbicide like atrazine.

- Use the higher rate when applied alone.

Rate Ranges: If the weed infestation is light, use a rate at the lower end of the rate range for the soil texture and organic matter content. If the weed infestation is heavier, use the higher rates in the rate range for the soil texture and organic matter.

Weeds Controlled:

TopNotch, applied as directed in the label, will provide control or partially control (reduce competition) of the weeds listed in Table 3 of the label. Partially controlled weeds will be severely stunted, or experience reduced height, vigor, or population compared to untreated areas. Depending on the infestation level or density, a follow-up treatment may be needed to provide complete control.

Additional weeds may be controlled with certain tank mixes. See the “Tank Mix Combinations” section for recommended tank mix combinations and the additional weeds controlled.

Yellow nutsedge requires a minimum of 2.5 quarts. Incorporation is required.

Lambsquarters, common: Light to moderate infestations will be controlled. Heavy infestations may require a tank mixture or sequential herbicide.

Panicum, texas, Signalgrass, broadleaf: Best control is achieved when TopNotch is applied within 5 days of planting and rainfall occurs shortly after application or mechanical incorporation is used to activate the herbicide. If it does not rain within 7 days, shallow cultivation will enhance activity. Excessive rainfall after application may reduce control. Under adverse weather conditions and/or heavy infestations, a cultivation or follow up herbicide may be needed.

Restricted Entry Interval

12 hours