Skip to main content

Larvadex 1% Premix

This page contains information on Larvadex 1% Premix for veterinary use.
The information provided typically includes the following:
  • Larvadex 1% Premix Indications
  • Warnings and cautions for Larvadex 1% Premix
  • Direction and dosage information for Larvadex 1% Premix

Larvadex 1% Premix

This treatment applies to the following species:
Company: Elanco US (Farm Animal)

For fly control in and around

(1) Caged or slatted flooring layer chicken operations.

(2) Breeder chicken operations.


Active Ingredient

Cyromazine: N-cyclopropyl-1,3,5-triazine-2,4,6-triamine


Inert Ingredients:





Larvadex 1% Premix Caution

EPA Reg. No. 70585-1 / EPA Est. 7455-IA-001



IMPORTANT: Read the entire Directions for Use and the Conditions of Sale and Warranty before using this product. If terms are not acceptable, return the unopened product container at once.

Conditions Of Sale And Warranty

The Directions for Use of this product reflect the opinion of experts based on field use and tests. The directions are believed to be reliable and should be followed carefully. However, it is impossible to eliminate all risks inherently associated with use of this product. Injury, ineffectiveness, or other unintended consequences may result because of such factors as weather conditions, presence of other materials, or the manner of use or application all of which are beyond the control of Elanco US Inc. or the Seller. All such risks shall be assumed by the Buyer.

Elanco warrants that this product conforms to the chemical description on the label and is reasonably fit for the purposes referred to in the Directions for Use subject to the inherent risks referred to above. Elanco makes no other express or implied warranty of Fitness or Merchantability or any other express or implied warranty. In no case shall Elanco or the Seller be liable for consequential, special, or indirect damages resulting from the use or handling of this product. Elanco and the Seller offer this product, and the Buyer and user accept it, subject to the foregoing Conditions of Sale and Warranty, which may be varied only by agreement in writing signed by a duly authorized representative of Elanco.

General Information

Larvadex 1% Premix is a premix which, when blended into a poultry ration according to the Directions for Use given below, will control certain fly species which develop in poultry manure. Larvadex 1% Premix is intended for use only in poultry (chickens) layer and breeder operations.

Directions For Use

It is a violation of federal law to use this product in a manner inconsistent with its labeling.


Fly control in poultry operations should include appropriate sanitary and management practices to reduce the number and size of fly breeding sites. A successful sanitary and management program may allow less than constant use of insecticides. This, in turn, should prolong the effective life of such control agents.

Eliminating Fly Breeding Sites

Certain conditions around poultry operations encourage flies and should be brought under control or eliminated as an aid to fly control. These include:

● Removing broken eggs and dead birds.

● Cleaning up of feed spills, manure spills, especially if wet.

● Reducing feed spills in the manure pits.

● Reducing moisture in manure in the pits.

● Repairing water leaks that cause wet manure.

● Cleaning out weed-choked water drainage ditches.

● Minimizing sources from other fly-infested animal operations in close proximity to the poultry house.

Determining The Threshold Of Fly Tolerance

Fly pressure can vary depending on farm location, season of the year, and emphasis on sanitation. Newer, controlled environment poultry houses are known to be less susceptible to fly populations re-establishing, once brought under control. Frequency of manure removal and proximity of the farm to neighbors or residential areas will greatly influence the expected degree of fly control. Each farm must determine the level of fly control required and follow an appropriate control program.

Blending And Feeding Larvadex 1% Premix

Housefly, soldier fly, lesser housefly: Mix 1 lb of Larvadex 1% Premix per ton of feed. Feed the treated feed as a daily ration. Begin feeding when adult flies become active and continue treatment as prescribed through the fly season.

Important Note To Feed Mill Operators

Larvadex 1% Premix feed formulators (those mixing as a service to customers) must inform the feed user that treated feed must be removed from layers and breeders at least 3 days before slaughter. The following label statement is suggested for use on treated feed containers: “This poultry feed is formulated with 5.0 ppm (0.01 lb./ton) cyromazine. Treated feed must not be fed to layers and breeders for a minimum of 3 days (72 hrs.) before slaughter for food.”

Larvadex 1% Premix will provide a high degree of fly control and will give best results when integrated with a well-managed fly control program which includes minimization of fly breeding sites, a determination of the degree of fly control desired, a monitoring of adult fly populations in and around the operation; and frequent examinations of manure for maggot activity.

When And How To Use Larvadex 1% Premix

First, monitor adult flies in and near the poultry house. When the population reaches a level to cause concern, use a registered adulticide spray or fog to reduce the breeding potential. Then, examine manure in the pits for maggot activity. If maggots are active, start Larvadex 1% Premix in the ration.

Feed Larvadex 1% Premix continuously as directed for 4 to 6 weeks. Usually, this is enough time for Larvadex 1% Premix to thoroughly cover the droppings and break the fly population cycle in the poultry house.

After a minimum of 4 to 6 weeks of Larvadex 1% Premix feeding, carefully examine the manure pits. If little or no activity is observed in the manure, discontinue Larvadex 1% Premix and continue the sanitary and management program. Continue monitoring the manure pits. If maggots become active again, repeat the procedure.

Use bait, sprays, or fogs as needed during and between Larvadex 1% Premix feeding periods to control any adult flies.

During winter months or during periods of low fly pressure, discontinue Larvadex 1% Premix use for at least 4 consecutive months per year.

Consult with local extension service poultry entomologists or your State Agricultural Experiment station for additional localized fly control suggestions.

Note: Do not feed Larvadex 1% Premix treated feed to broiler poultry. Larvadex 1% Premix use in poultry is limited to use as a feed-through in chicken layer and breeder operations only and may not be fed to any other poultry species.

To avoid illegal residues, Larvadex 1% Premix treated feed must be removed at least 3 days (72 hrs.) before slaughter.

Manure from chickens fed Larvadex 1% Premix may be used as a soil fertilizer supplement. Do not apply more than 3 tons of manure per acre per year. Do not apply to small grain crops that will be harvested or grazed or illegal residues may result. Do not feed manure from chickens fed Larvadex 1% Premix to animals.

Storage And Disposal

Do not contaminate water, food, or feed by storage or disposal practices. Store in a dry place.

Pesticide: Wastes resulting from the use of this product may be disposed of on site or at an approved waste disposal facility.

Container: Non-refillable container. Do not use or refill this container. Completely empty bag into mixer. Then offer for recycling if available or dispose of empty bag in a sanitary landfill or by incineration or, if allowed by state and local authorities, by burning. If burned, stay out of smoke.

In case of fire, accident, major spillage, or Transportation Emergency, contact CHEMTREC at 1-800-424-9300, day or night.

Precautionary Statements

Hazards to Humans and Domestic Animals

Larvadex 1% Premix Caution

Harmful if inhaled or absorbed through the skin. Avoid breathing dust. Avoid contact with skin or clothing. May cause skin sensitization reactions in certain individuals. Wash thoroughly with soap and water after handling.

First Aid

Call a poison control center or doctor for treatment advice. Have the product container or label with you when calling a poison control center or doctor, or going for treatment.

If on skin or clothing - Take off contaminated clothing. Rinse skin immediately with plenty of water for 15 - 20 minutes.

If in eyes - Hold eye open and rinse slowly and gently with water for 15 - 20 minutes. Remove contact lenses, if present, after the first 5 minutes, then continue rinsing eye.

If inhaled - Move person to fresh air.

- If person is not breathing, call 911 or an ambulance, then give artificial respiration, preferably mouth-to-mouth if possible.

Hot Line Number


Environmental Hazards: Keep out of lakes, ponds, or streams. Do not contaminate water by cleaning of equipment or disposal of wastes.


Larvadex, Elanco and the diagonal bar logo are trademarks of Elanco or its affiliates.

Product of China

Distributed by: Elanco US Inc. 2500 Innovation Way, Greenfield, IN 46140

Net Weight

Product ID.


25 Pounds



CPN: 1114091.8

Distributed by ELANCO US, INC.
Customer Service:   317-276-1262
Technical Service:   800-428-4441
THIS SERVICE AND DATA ARE PROVIDED "AS IS". DVMetrics assumes no liability, and each user assumes full risk, responsibility, and liability, related to its use of the DVMetrics service and data. See the Terms of Use for further details.

Copyright © 2023 Animalytix LLC. Updated: 2023-02-28