Malathion 50

This page contains information on Malathion 50 for veterinary use.
The information provided typically includes the following:

  • Malathion 50 Indications
  • Warnings and cautions for Malathion 50
  • Direction and dosage information for Malathion 50

This treatment applies to the following species:

Manufacturer: Vétoquinol


  • Emulsifiable Concentrate

  • To Control Aphids, Leafhoppers And Certain Other Insects On Vegetables, Cereals, Forage And Ornamental Plants. Also Effective Against Livestock And Poultry Pests.

  • Back Rubbing For Dairy And Beef Cattle

  • Agricultural

  • Group 1b Insecticide

  • Read The Label And Insert Before Using

  • Keep Out Of Reach Of Children

  • Guarantee: Malathion - 534g/l

  • Registration Number 13883 Pest Control Products Act

  • Malathion 50 Caution: Poison

Directions For Use

Dosages refer to the quantity of litres of product per 1000 litres of water when not specified.

Asparagus: Asparagus Beetle - 2.75 L - Apply When Beetles Appear. Repeat As Needed. Spray To Harvest Interval 1 Day.


Pea Weevils, Pea Aphids, Pea Moths, Leafhoppers: 2.0 L - Apply at first sign of infestation and repeat as necessary. Spray to harvest interval 3 days.


Leaf Miners - 2.0 L - Apply at first sign of infestation, and repeat as necessary. Spray to harvest interval 7 days.


Mexican Bean Beetle, Aphids, Leafhoppers, Spider Mites - 1.5 to 2.75 L - Apply when insects appear. Repeat as needed. Spray to harvest interval 1 day.


Aphids, Spider Mites - 2.0 to 2.75 L - Apply when insects appear. Repeat as needed. Spray to harvest interval 3 days.

Field Lettuce (head & Leaf), Endive

Cabbage Looper, Six-spotted Leafhopper, Aphids, Spider Mites - 2.0 to 2.75 L - Apply when insects appear. Repeat as needed. Spray to harvest interval 7 days for Head Lettuce and Endive, 14 days for Leaf Lettuce.


Pepper Weevil, Pepper Maggot, Leafhoppers, Aphids - 2.0 to 2.75 L - Apply when insects appear. Use higher rate for Pepper Maggot and begin application about July 1. Check for correct timing in your area. For Maggots, apply 4 sprays at 7 days intervals. Spray to harvest interval 3 days.

Tomatoes, Potatoes, Turnips

Aphids - 1.5 L - Apply at first sign of infestation. Spray to harvest interval 3 days. Turnips (roots and tops) 7 days.


Leaf Miners, Aphids - 2.75 to 3.5 L - Spray when Miners appear. Repeat as needed. Spray to harvest interval 7 days.

Mushroom Beds

Mites, Phorid and Sciarid Flies - 2.5 to 3.5 L - Apply 100 L of spray mist per 1,000 m2 of bed surface immediately after picking. Repeat approximately twice a week or as required. Do not apply within 2 days of harvest.

MUSHROOM HOUSES (in production): Phorid and Sciarid Flies - 2.0 to 3.0 L - Apply as a spray or as a paint. Treat all wooden surfaces to the point of run-off. Repeat as necessary. DO NOT SPRAY THE BED SURFACE WHEN THE TIME OF APPLICATION OR THE VOLUME OF SPRAY DIFFERS FROM THAT RECOMMENDED FOR BED APPLICATION.

Ornamental Plants

Aphids, Spider Mites, Whiteflies, Mealy Bugs, Thrips, Leafhoppers - 1.5 L - Make thorough full coverage sprays and repeat as necessary. Injury may occur on certain ferns such as Boston, Maidenhair and Pteris, also Petunias, Crassula, African Violets and Holly.

CEREALS - (WHEAT, BARLEY, OATS, RYE): Greenbug, Grain Aphids - 1.5 to 2.75 L per hectare. Spray when infestation first appears. Cereal Leaf Beetle - 550 mL to 1.1 litre per hectare.

For Low Volume Aircraft Application, Apply When Adults Are Active. Repeat At Higher Rate In 2 To 14 Days For Control Of Adults And Young Larvae. Spray To Harvest Interval 7 Days. **see Aerial Application Instructions Below.


Young Grasshoppers - 1.1 to 1.75 L per hectare. Pastures may be grazed immediately after treatment. Dairy cattle should be removed from pasture during time of spraying.

Flax, Mustard (condiment Type Only), Canola, Rape

Grasshoppers - 1.1 to 1.75 L per hectare.


Grasshoppers - 2.0 to 2.75 L per hectare. Spray to harvest interval 7 days.

Note Re: Grasshoppers: Apply In Sufficient Water To Give Good Coverage. Apply When Temperature Is Above 18oc And Bees Are Absent. To Control Young Grasshoppers, Use Lower Rate And For More Mature Insects Use The Higher Rate Per Hectare.

Mustard (condiment Type Only), Canola, Rape

Diamond Back Moth - 550 mL to 850 mL per hectare.

For low volume application by aircraft. Do not apply within 7 days of harvest.

Canola, Rape

Flea Beetles - 1.1 L per hectare. Apply with conventional ground sprayer or aircraft. Do not apply within 7 days of harvest.


Weevil Larvae - 2.25 L per hectare.

For low volume aircraft application. Treat when 50 - 75% of leaves show feeding. Do not treat when in bloom. Do not apply within 7 days of harvest. Do not treat seed alfalfa.

Farm Buildings

Stable Flies, House Flies, Mosquitoes, Lice - 2 to 4 L of product per 200 L of water - Spray walls and ceiling of barns thoroughly to point of run-off. Attractants such as molasses, syrup or sugar may be used at the rate of 10 L per 500 L of water. Repeat in 2 to 3 weeks, or as needed. Do not apply to fresh white wash until after 14 days, do not treat dairy barns.

For Poultry Houses

Chicken Mite, Northern Fowl Mite, Lice - use a mixture of 525 mL of product per 10 L of water for Lice and a mixture of 175 mL of product per 10 L of water for Mites. Apply mix to get thorough coverage of nests, roosts, floors and litter. Do not apply directly to birds. Repeat as needed. May be used on shipping crates after use. Avoid contamination of food and water troughs. Avoid exposing birds to drafts after spraying. See limitation 5.

Beef Cattle, Non-milking Dairy Cattle

To control Lice use 4 L of product per 100 L of water (2.4 L in 60 L or 160 mL in 4 L). Spray for complete coverage. Avoid eyes, ears and nose of animals. See limitations 1, 3 and 4.

Back Rubbing Devices For Dairy Cattle And Beef Cattle

For the reduction of Lice and Horn Flies on Dairy and Beef Cattle, apply a mixture of 350 mL of product per 10 L of fuel or diesel oil to back rubbing devices. These devices should always be accessible (one for each 35-45 animals) and refilled every 2 to 3 weeks. See limitations 1 and 4.


Sarcoptic Mange Mite - Apply 2.3 L of a solution containing 175 mL of product per 10 L of water per animal. Repeat in 12 days if necessary. Avoid eyes, mouth and nose of animals. See limitations 1, 2 and 4.

GRANARY BINS (FOR GRAINS): Confused Flour Beetle, Granary Weevil, Sawtoothed Grain Beetle, Flat Grain Beetle, Rusty Grain Beetle - Mix 250 - 300 mL of product per 5 L of water and apply to 100m2 - 2 to 4 weeks before storing grain. May be used within 1 day of storing grain. When bins are empty, repeat as needed. Also, treat outside of bins.


1- Do not apply to animals under one month of age.

2- Do not apply to adult animals nursing young.

3- Do not apply to dairy animals within two weeks of calving.

4- Do not apply to livestock within 30 days of slaughter.

5- Do not apply to poultry within one week of slaughter.

For resistance management, please note that MALATHION 50 contains a Group 1B insecticide. Any insect population may contain individuals naturally resistant to MALATHION 50 and other Group 1B insecticides. The resistant individuals may dominate the insect population if this group of insecticides are used repeatedly in the same fields. Other resistance mechanisms that are not linked to site of action but are specific for individual chemicals, such as enhanced metabolism, may also exist. Appropriate resistance-management strategies should be followed.

To Delay Insecticide Resistance

1. Where possible, rotate the use of MALATHION 50 or other Group 1B insecticides with different groups that control the same pests in a field.

2. Use tank mixtures with insecticides from a different group when such use is permitted.

3. Insecticide use should be based on an IPM program that includes scouting, record keeping, and considers cultural, biological and other chemical control practices.

4. Monitor treated pest populations for resistance development.

5. Contact your local extension specialist or certified crop advisors for any additional pesticide resistance-management and/or IPM recommendations for the specific site and pest problems in your area.

6. For further information or to report suspected resistance, contact Vétoquinol N.-A. Inc. at 1-800-363-1700 or at


KEEP OUT OF REACH OF CHILDREN AND DOMESTIC ANIMALS. Hazardous if swallowed. Avoid inhalation of spray mist. Avoid contact with skin and eyes. Wash exposed skin with soap and water after spraying. Remove contaminated clothing and clean before re-use. Use a proper respirator when spraying in an enclosed area. Do not store near food or feed. Do not contaminate food and foodstuffs. Highly toxic to fish and bees. Do not contaminate water supplies. Do not treat any plants while in bloom. Keep container tightly sealed when not in use. If this pest control product is to be used on a commodity that may be exported to the U.S. and you require information on acceptable residue levels in the U.S., contact 1-866-375-4648 or

Environmental Precautions

This product contains a petroleum distillate which is moderately to highly toxic to aquatic organisms. Avoid contamination of aquatic systems during application. Do not contaminate these systems through direct application, disposal of waste or cleaning equipment.


Keep container closed and away from excessive heat and open flame.

First Aid

DANGER - This product contains petroleum distillate, therefore if swallowed, DO NOT induce vomiting. If patient is unconscious, give air. Obtain medical attention immediately, or call a Poison Control Centre. If in eyes, flush with plenty of water, get medical attention. If on skin wash with soap and water. Take container, label or product name and Pest Control Product Registration Number with you when seeking medical attention.

Toxicological Information

Malathion, upon repeated or prolonged use, may cause cholinesterase inhibition. Atropine is the antidote. In severe cases administer 4mg intravenously at intervals of 10 to 15 minutes until atropinization is achieved. For children administer proportional dosage based on body weight. Do not use 2-PAM.


1. Triple- or pressure rinse the empty container. Add the rinsings to the spray mixture in the tank. 2. Follow provincial instruction for any required additional cleaning of the container prior to its disposal. 3. Make the empty container unsuitable for further use. 4. Dispose of the container in accordance with provincial requirements. 5. For information on disposal of unused, unwanted product, contact the manufacturer or the provincial regulatory agency. Contact the manufacturer and the provincial regulatory agency in case of a spill, and for clean-up of spills.


Directions for Use: Apply only by fixed-wing or rotary aircraft equipment which has been functionally and operationally calibrated for the atmospheric conditions of the area and the application rates and conditions of this label.

Label rates, conditions and precautions are product specific. Read and understand the entire label before opening this product. Apply only at the rate recommended for aerial application on this label. Where no rate for aerial application appears for the specific use, this product cannot be applied by any type of aerial equipment.

Ensure uniform application. To avoid streaked, uneven or overlapped application, use appropriate marking devices.

Use Precautions: Apply only when meteorological conditions at the treatment site allow for complete and even crop coverage. Apply only under conditions of good practice specific to aerial application as outlined in the Basic Knowledge Requirements for Pesticide Education in Canada: Applicator Core and Aerial Module, developed by CAPCO.

Do not apply to any body of water. Avoid drifting of spray onto any body of water or other non-target areas. Specified buffer zones should be observed.

Coarse sprays are less likely to drift, therefore, avoid combinations of pressure and nozzle type that will result in fine particles (mist). Do not apply during periods of dead calm or when wind velocity and direction pose a risk of spray drift. Do not spray when the wind is blowing towards a nearby sensitive crop, garden, terrestrial habitat (such as shelter-belt) or aquatic habitat.

Operator Precautions: Do not allow the pilot to mix chemicals to be loaded onto the aircraft. Loading of premixed chemicals with a closed system is permitted.

It is desirable that the pilot have communication capabilities at each treatment site at the time of application.

The field crew and the mixer/loaders must wear chemical resistant gloves, coveralls and goggles or face shield during mixing/loading, cleanup and repair. Follow the more stringent label precautions in case where the operator precautions exceed the generic label recommendations on the existing ground boom label.

All personnel on the job site must wash hands and face thoroughly before eating and drinking. Protective clothing, aircraft cockpit and vehicle cabs must be decontaminated regularly.

Product Specific Precautions: Read and understand the entire label before opening this product. If you have questions, call the manufacturer at 1-800-363-1700 or obtain technical advice from the distributor or your provincial agricultural representative. Application of this specific product must meet and/or conform to the above-mentioned recommended minimum rates spray volume of liters per hectare.

Notice To User

This pest 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 this product in a way that is inconsistent with the directions on the label. The user assumes the risk to persons or property that arises from any such use of this product.

Vétoquinol N.-A. Inc., 2000, ch. Georges, Lavaltrie, QC, Canada J5T 3S5












Nac No.



Telephone:   450-586-2252
Order Desk:   800-363-1700
Fax:   450-586-4649
Email:   This email address is being protected from spambots. You need JavaScript enabled to view it.
Every effort has been made to ensure the accuracy of the Malathion 50 information published above. However, it remains the responsibility of the readers to familiarize themselves with the product information contained on the Malathion 50 product label or package insert.