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Cyren 500 WP



APVMA Code :51513

Active Constituent(s):

500g/kg chlorpyrifos

(an anticholinesterase compound)

Registered For:


 Commercial use

 Domestic use

Overview: For the control of insect pests in fruit and other situations.

Chemical Group organophosphates


 SDS (305.7 KB)

 Label (193.6 KB)

General Instructions




Spray Mix: One third fill the spray tank with water and add the required number of water soluble pre-packs to the strainer/sieve. Complete filling allowing the remaining water to run over the bags. The bags will completely dissolve in a few minutes.


Add the required number of pre-packs to a mixing bucket and add enough water to completely cover the bags. Stir until the bags are completely dissolved and pour the pre-mix into the spray tank. Triple rinse the bucket and stirring implement, adding the rinse water to the spray tank. Agitate continuously to ensure thorough mixing before and during application. Only mix sufficient chemical for each day's work.


Tank mixtures: CYREN 500 WP Insecticide should be added to the partially full spray tank first, followed by dry flowables, suspension concentrates (flowables), aqueous concentrates and then emulsifiable concentrate formulations.


Seed Dressing: Use a respirator with a dust canister, wear elbow-length PVC gloves and cover all bare skin. Half fill the seed box and sprinkle half the powder evenly over the seed. Mix thoroughly with a wooden or metal stirrer. Repeat the process after adding the remaining seed and powder. Only mix in the seed box prior to sowing. DO NOT store treated seed for later use.



CYREN 500 WP Insecticide is compatible with benomyl, carbendazim, dicofol, dinocap, dodine, fenarimol, mancozeb, thiram, thiophanate-methyl, and ziram.




Unless specified, it is essential to apply CYREN 500 WP Insecticide in sufficient water to obtain thorough coverage. Apply through accurately calibrated equipment.


Cleaning Spray Equipment

Rinse water should be discharged onto a designated disposal area or, if this is unavailable onto unused land away from homes and watercourses.

After using CYREN 500 WP Insecticide, empty the spray equipment completely and drain the whole system. Quarter fill the spray equipment with clean water and circulate through the pump, line, hoses and nozzles. Drain and repeat procedure twice.



DO NOT apply if bees are actively foraging


Resistance Warning


For insect resistance management CYREN 500 WP INSECTICIDE is a Group 1B insecticide.


Some naturally-occurring insect biotypes resistant to CYREN 500 WP INSECTICIDE and other Group 1B insecticides may exist through normal genetic variability in any insect population. The resistant individuals can eventually dominate the insect population if CYREN 500 WP INSECTICIDE or other Group 1B insecticides are used repeatedly. The effectiveness of CYREN 500 WP INSECTICIDE on resistant individuals could be significantly reduced. Since occurrence of resistant individuals is difficult to detect prior to use, Cheminova accepts no liability for any losses that may result from the failure of CYREN 500 WP INSECTICIDE to control resistant insects.


CYREN 500 WP INSECTICIDE may be subject to specific resistance management strategies. For further information contact your local supplier, representative or local agricultural department agronomist.


Protection of wildlife, fish, crustaceans and environment



DO NOT contaminate streams, rivers or waterways with the chemical, used containers or containers used for mixing or holding seed.


DO NOT feed or expose treated seed to wildlife and domestic animals, particularly birds. Only treat target plants.


DO NOT re-apply to the same crop within 7 days (unless specifi cally recommended in the directions for use).


Spray drift may occur under adverse meteorological conditions or from certain spray equipment. DO NOT allow spray to drift onto sensitive areas including, but not limited to, natural streams, rivers or waterways and human dwellings. A spray drift management strategy such as those in the Best Management Practices Manual for Cotton Growers or the Pilot and Operators Manual should be applied. Options for minimising drift to sensitive areas include not spraying within a certain distance of sensitive areas when the wind is blowing towards them (see table for guidance) or ensuring that drifting spray will be intercepted by a catching surface such as a row of shelter trees an unsprayed row of orchard trees, or hail netting.


Orchard (dormant trees, citrus, large trees) - buffer - 30 m


Cotton (aerial application) - buffer - 300 m


Other crops (aerial application) - buffer - 100 m


DO NOT apply if heavy rains or storms that are likely to cause surface runoff are forecast in the immediate area within 2 days of application. DO NOT apply when irrigating, or to waterlogged soil; or while water remains on the surface or in furrows, unless tail water is captured on farm.


DO NOT allow contaminated runoff water from treated paddocks to enter adjacent areas or water bodies. Runoff contaminated by irrigation events (tailwater) and a 25 mm rainstorm should be captured on farm for 2 days after application.


Protection of crop, native and other non-target plants

Only treat target plants. DO NOT allow spray to drift.


Safety Directions


Product is poisonous if absorbed by skin contact, inhaled or swallowed. Repeated minor exposure may have a cumulative poisoning effect. Obtain an emergency supply of Atropine tablets 0.6mg. Will irritate the eyes and skin. Avoid contact with eyes and skin. Do not inhale dust or spray mist. When opening the container, preparing the spray or using the prepared spray, wear cotton overalls buttoned to the neck and wrist, a washable hat, elbow-length PVC gloves and a face shield or goggles. If product on skin, immediately wash area with soap and water. After use and before eating, drinking or smoking, wash hands, arms and face thoroughly with soap and water. After each day's use wash gloves, face shield or goggles and contaminated clothing.



Store in the closed, original container in a dry, cool, well-ventilated area out of direct sunlight.



Single rinse before disposal. Add rinsings to spray tank. Do not dispose of undiluted chemicals on site. Puncture and bury empty containers in a local authority landfill. If no landfill is available, bury the containers below 500mm in a disposal pit specially marked and set up for this purpose clear of waterways, desirable vegetation and tree roots. Empty containers and product should not be burnt.



Wear appropriate clothing whilst cleaning up small spills (see Safety Directions). Remove bulk dust from surfaces and sweep up residual material. Place in a refuse container which prevents further dispersion of the powder. If spilled inside a building, wipe contaminated surfaces with a dilute solution of bleach (sodium hypochlorite). Dispose of the contaminated material in accordance with State and/or local regulations. Triple rinse cleaning equipment, discharging rinse water onto a designated disposal area, or if this is unavailable, onto unused land away from homes and water courses.


Precautions Re-entry Period

Field crops, tree crops and vines: DO NOT allow entry into treated crops until spray deposits have dried. If prior entry is required, limit duration of entry and wear cotton overalls buttoned to the neck and wrist (or equivalent clothing) and chemical resistant gloves. Clothing must be laundered after each day's use.


Greenhouses: DO NOT allow entry into greenhouses until spray deposits have dried and treated areas are adequately ventilated. If prior entry is required, limit duration of entry and wear cotton overalls buttoned to the neck and wrist (or equivalent clothing), chemical resistant gloves and half-facepiece respirator. Clothing must be laundered after each day's use.



Seed treated with CYREN 500 WP must not be used for human consumption.


Product details last updated on 25 Jun 2010


DISCLAIMER: This is not the CYREN 500 WP label. To view or print the label for this product, click the "MSDS/Label" tab at the top of this page. Always follow label instructions.


For specialist advice in an EMERGENCY only phone 1800 033 111, TOLL-FREE, ALL-HOURS, NATIONWIDE

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