Active Ingredient(s):

700g/kg saflufenacil


A broadleaf herbicide for use pre-emergence in maize, sweet corn crops and pre-plant burn down in seed bed preparation and conservation tillage, in apple and pear orchards, and in non-agricultural situations.


General Instructions

General Information

SHARPEN is a novel herbicide for use in tank mix with knockdown herbicides such as glyphosate to enhance the speed of knockdown and to broaden the weed spectrum of the knockdown partner. Symptoms of herbicidal activity are visible soon after application with death ensuing in a few days. SHARPEN is systemic but thorough coverage of the target weed is necessary for best results. Best results are obtained from application to small, actively growing weeds. Conditions conducive to maximum photosynthesis (moist, warm, bright sunshine) are ideal. SHARPEN also assists in the rapid desiccation and reduction in palatability to stock of poisonous weeds such as ragwort.

Symptoms: SHARPEN is rapidly absorbed through the roots and foliage of plants. Within a few hours following application, the foliage of susceptible weeds shows signs of desiccation, and in subsequent days necrosis and death of the plant. Extremes in environmental conditions e.g. temperature and moisture, soil conditions and cultural practices may affect the activity of SHARPEN. Under warm moist conditions, herbicide symptoms may be accelerated. Under very dry conditions, the expression of herbicidal symptoms is delayed, and weeds hardened off by drought are less susceptible to SHARPEN.

Weeds controlled: When used in tank mixture with glyphosate SHARPEN increases the speed of knockdown of grasses such as annual poa and ryegrass; and broadleaved weeds such as dandelion, docks, clover, mallows, plantains and tall willow herb. When used in tank mixture with a residual grass herbicide in maize crops SHARPEN will control fathen, black nightshade, broadleaf docks (seedling), willow weed and wireweed, and will suppress pink shamrock.

Resistance Management

SHARPEN contains a herbicide from the PPO (protoporphyrinogen-IX-oxidase) group, HRAC GROUP E HERBICIDE . Resistance to SHARPEN could develop from excessive use. To minimise this risk use strictly in accordance with label instructions. Frequency of application is to be strictly in accordance with the Directions for Use. SHARPEN should be used in a programme which incorporates effective herbicide products with alternate modes of action.


Apply this product carefully. Spray drift may cause serious damage to other desirable plants.


SHARPEN should be used with a suitable adjuvant such as an esterified canola oil (e.g. Hasten) or a silicon based product except when used pre-emergence in maize.


SHARPEN is compatible with most commonly used herbicides, adjuvants and insecticides. Follow the precautions and the directions for use on the partner product label.

Mixing and Application

Half-fill the spray tank with clean water and start the agitation. Add the required amount of SHARPEN directly into the partly filled spray tank with agitation operating. Rinse any empty containers thoroughly and add rinsate to the spray tank. Add partner herbicides and adjuvant. Complete filling and maintain agitation until spraying is completed. SHARPEN can be applied through conventional spray equipment used for glyphosate application. Care must be taken to avoid drift. Ensure the water rate is sufficient for complete coverage of target weeds.

Drift Management

As SHARPEN is used with glyphosate, application should be undertaken with minimization of drift in mind. Avoid spray solution contacting any desirable plants. Do NOT apply when conditions favour drift e.g. high winds or incorrect pressure and nozzle setup.


SHARPEN is rainfast once dried on the crop. Do NOT apply if rainfall is expected within 1 hour of application.

Tank Cleaning:

To avoid injury to subsequent spayed crops, thoroughly remove all traces of chemical from mixing and spraying equipment. Flush equipment thoroughly with water after use.

Crop Plant Back & Rotational Recommendations

SHARPEN, when used as directed, does not provide long term residual activity. Refer to the table below for the application-to-sow intervals. For crops not specified, such as tomato and fodder beet, a soil sample must be checked for suitability for planting by means of a germination test prior to full planting. If in doubt contact your spray representative. Check the label of any partner mixed with SHARPEN to determine any other plant back periods or restrictions on use (see label).


Do NOT handle until all safety precautions have been read and understood. This product must be under the personal control of an APPROVED HANDLER when applied in a wide dispersive manner or used by a commercial contractor.


Prevent further spillage and product from entering waterways. Wear overalls, gloves, footwear and goggles. Sweep and shovel up spill and place in sealable container labelled for disposal. Avoid dust formation. Wash affected area with water and detergent. Absorb and collect washings and place in the same sealable container as the spilled material. Dispose of the waste safely in suitable landfill.

Personal Protection

When mixing or applying, wear overalls buttoned to the neck and wrist, suitable footwear, a washable hat, suitable chemical resistant gloves, and safety goggles or face shield.

General Safety and Hygiene Measures

Avoid contact with skin, eyes and clothing. Avoid inhalation of spray mist. Do NOT eat, drink or smoke while using this product. Remove protective clothing and wash hands and exposed skin thoroughly with soap and water before meals and after work. Wash protective clothing immediately after use. Store work clothing separately.


Apply by ground based methods only. Do NOT apply onto or into water. Apply with well-maintained and accurately calibrated equipment. Prevent spray drift onto other crops and non-target plants outside of the target area or severe damage may result. Clean out application equipment thoroughly after use. Do NOT contaminate water when disposing of equipment wash waters. Wear personal protective equipment if re-entry work is required within 24 hours of application where this product has been applied at 30 g/ha or greater. Public access is not permitted during this period.

Record Keeping

Records of use must be kept if 3 kg or more of this product is applied in a place where it is likely to enter air or water and leave the place.


Storage, application and record keeping must be as described in the current version of the New Zealand Standard for the Management of Agrichemicals NZS8409.

First Aid

If exposed or concerned get medical advice/attention. IF SWALLOWED: Do NOT induce vomiting. Rinse mouth. For advice contact the National Poisons Centre 0800 POISONS (0800 764 7660800 764 766 FREE) or a doctor. Have product container or label at hand. IF ON SKIN OR HAIR: Remove contaminated clothing and flush skin and hair with running water. Do NOT scrub the skin. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. If eye irritation persists, get medical advice/attention. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Get medical advice/attention if you feel unwell.


Do NOT use on any crop not specified on the label.

Except on planted maize crops, do NOT apply within one day of planting or if rain is expected immediately after planting.


Store in original container, tightly closed in a dry, cool, well-ventilated place away from food and animal feeds. Protect against moisture and from direct sunlight. Stores containing 100 kg or more of this product require emergency response plans and secondary containment systems and are subject to signage. When stored appropriately this product should show no significant degradation for two years from the date of manufacture. Contact your supplier for further information about the use of any product that is older than this.


Container: Ensure container is completely empty. Triple rinse container and add rinsate to the spray tank. Recycle the rinsed container through Agrecovery (0800 247 3260800 247 326 FREE, Product: Dispose of this product only by using according to the label or at an approved landfill. Do NOT burn product. Do NOT contaminate surface water with chemical or empty container. Do NOT reuse this container for any other purpose.



May be harmful if swallowed, inhaled or absorbed by the skin. May cause reproductive/developmental damage through repeated oral exposure. TOXIC. May cause organ damage including hepatotoxicity through repeated oral exposure.

Very Toxic to Aquatic Organisms

May cause long-term adverse effects in the aquatic environment. Drift and runoff from treated areas may be hazardous to aquatic plants in adjacent aquatic sites.

Product details last updated on 29 Aug 2012

DISCLAIMER: This is not the SHARPEN label. To view or print the label for this product, click the "SDS/Label" tab at the top of this page. Always follow label instructions.

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