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Starbar Inhibidor Insecticidal Pour-On

This treatment applies to the following species:
Company: Wellmark

Current label information has not been provided by the product owner.

This information is provided as a service to our users.



Combination of an insect growth regulator, adulticide and synergist

Provides control of chewing and sucking lice

Kills horn flies, horse flies and deer flies

For use on: beef cattle and calves

2.5 gallon treats 320 cattle; 64 oz treats 64 cattle (1,000 lb per animal)


Active Ingredient




Piperonyl Butoxide*








*(butylcarbityl)(6-propylpiperonyl) ether and related compounds

**Contains petroleum distillates


EPA Reg. No. 89459-127

EPA Est. No. 2724-TX-1



● Immediately call a poison control center or doctor for treatment advice.

● Do not induce vomiting unless told to do so by a poison control center or doctor.

● Do not give any liquid to the person.

● Do not give anything by mouth to an unconscious person.

HOT LINE NUMBER: Have the product container or label with you when calling a poison control center or doctor, or going for treatment. You may also contact 1-800-347-8272 for emergency medical treatment information.

NOTE TO PHYSICIAN: Contains petroleum distillate - vomiting may cause aspiration pneumonia.


Applicators and other handlers must wear the following:

Long-sleeve shirt and long pants;

Chemical-resistant gloves made of barrier laminate, nitrile rubber ≥ 14 mils, neoprene rubber ≥ 14 mils, or Viton ≥ 14 mils when mixing/loading or when using handheld equipment

Shoes and socks

Chemical-resistant apron for persons cleaning equipment, and for handlers performing animal dip applications

USER SAFETY REQUIREMENTS: Follow manufacturer’s instructions for cleaning/maintaining PPE. If no such instructions for washables exist, use detergent and hot water. Keep and wash PPE separately from other laundry. Discard clothing and other absorbent materials that have been drenched or heavily contaminated with this product’s concentrate. Do not reuse them.


Users should:

● Wash hands before eating, drinking, chewing gum, using tobacco, or using the toilet.

● Remove clothing/PPE immediately if pesticide gets inside. Then wash thoroughly and put on clean clothing.

● Remove PPE immediately after handling this product. Wash the outside of gloves before removing. As soon as possible, wash thoroughly and change into clean clothing.

PHYSICAL OR CHEMICAL HAZARDS: This product is extremely toxic to aquatic organisms, including fish and invertebrates. To protect the environment, do not allow pesticide to enter or run off into storm drains, drainage ditches, gutters or surface waters. Do not contaminate water when disposing of equipment washwaters or rinsate. Applying this product in calm weather when rain is not predicted for the next 24 hours will help to ensure that wind or rain does not blow or wash pesticide off the treatment area. See Directions for Use for additional precautions and requirements.

This product is highly toxic to bees exposed to direct treatment on blooming crops or weeds. Do not allow this product to drift to blooming crops or weeds while bees are actively foraging the treatment area.

Directions For Use

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

RESISTANCE-MANAGEMENT: For resistance management, please note that Starbar® Inhibidor™ Insecticidal Pour-On (Inhibidor™ Insecticidal Pour-On) contains both a Group 15/diflubenzuron and Group 3A/lambda-cyhalothrin insecticide. Any insect population may contain individuals naturally resistant to Inhibidor™ Insecticidal Pour-On and other Group 15 or Group 3A insecticides. The resistant individuals may dominate the insect population if these insecticides are used repeatedly in the same fields. Appropriate resistance-management strategies should be followed.

To delay insecticide/acaricide resistance, take the following steps:

● Adopt an integrated pest management program for insecticide use that includes scouting, uses historical information related to pesticide use, record keeping, and which considers cultural, biological and other chemical control practices.

● Monitor after application for unexpected target pest survival. If the level of survival suggests the presence of resistance, consult with your local university specialist or certified pest control advisor.

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

● For further information or to report suspected resistance contact Central Garden & Pet Company at (1-800-347-8272) or at (



● Apply this product only as specified on the label.

● Do not apply more than once every two weeks.

● Do not contaminate food or feedstuffs.

● Do not apply when food or feed is present.

● Remove or cover food processing equipment and food preparation surfaces or wash them before use.

● Do not make applications during rain. Avoid making applications when rainfall is expected before the product has sufficient time to dry (minimum 4 hours). Rainfall within 24 hours after application may cause unintended runoff of pesticide application.

● Do not make applications with a sponge.

● Do not apply by high pressure hand wand, handheld foggers, or fog/mist generators.

● Not for broadcast application.

● Do not use this product directly on domestic (companion) animals (dogs, cats, puppies, or kittens).

● This product is not for use in outdoor residential misting systems (indoor or outdoor), or in metered release misting systems.

● Not for use in commercial animal premise automatic misting systems.

● Removable chemical extraction probes (also knows as “stingers”) used in suction/extraction systems must be rinsed within the pesticide container prior to removal.

● Do not apply this product to face of beef cattle or calves.

● Do not apply this product in a way that will contact workers or other persons, either directly or through drift. Only protected handlers may be in the area during application.

● Do not apply the product into fish pools, ponds, streams or lakes. Do not apply directly to sewers or drains, or to any area like a gutter where drainage to sewers, storm drains, water bodies, or aquatic habitat can occur. Do not allow the product to enter any drain during or after application.

May be used only for pour-on application to beef cattle and calves, indoors or outdoors.


Apply To:

Target Pests

Application instructions

Beef Cattle and Calves

Chewing and Sucking Lice, Horn Flies, Stable Flies, Horse Flies, Deer Flies

Apply 0.1 fl oz (3 ml) of Inhibidor™ Insecticidal Pour-On per 100 lb body weight of cattle. This is equivalent to 1 fl oz (30 ml) per 1,000 lb animal. Pour correct dose along back directly from tip and measure container, graduated applicator gun or ladle/dipper. Keep away from eyes and mucous membranes of the animal being treated. Inhibidor™ Insecticidal Pour-On is not recommended for use on veal calves.

Special Note: This product is not effective in controlling cattle grubs, and can be used any time of year without risk of host-parasite reactions associated with grub treatment products.

Use this product in an integrated pest management system which may involve repeat treatments and the use of other pest control practices.


Do not contaminate water, food or feed by storage and disposal. PESTICIDE STORAGE: Store in a cool, dry and secure area. Store in original sealed container away from food or feed. PESTICIDE DISPOSAL: Wastes resulting from the use of this product must be disposed of on site or at an approved waste disposal facility. CONTAINER DISPOSAL: Nonrefillable Container (5 gallons or less) Nonrefillable container. Do not reuse or refill this container. Triple rinse container (or equivalent) promptly after emptying. Triple rinse as follows: Empty the remaining contents into application equipment or a mix tank and drain for 10 seconds after the flow begins to drip. Fill the container 1/4 full with water and recap. Shake for 10 seconds. Pour rinsate into application equipment or a mix tank or store rinsate for later use or disposal. Drain for 10 seconds after the flow begins to drip. Repeat this procedure two more times. Offer for recycling if available or reconditioning if appropriate, or puncture and dispose of in a sanitary landfill, or by other procedures approved by state and local authorities. Nonrefillable Container (greater than 5 gallons)] Nonrefillable container. Do not reuse or refill this container. Triple rinse container (or equivalent) promptly after emptying. Triple rinse as follows: Empty the remaining contents into application equipment or a mix tank. Fill the container 1/4 full with water. Replace and tighten closures. Tip container on its side and roll it back and forth, ensuring at least one complete revolution, for 30 seconds. Stand the container on its end and tip it back and forth several times. Turn the container over onto its other end and tip it back and forth several times. Empty the rinsate into application equipment or a mix tank or store rinsate for later use or disposal. Repeat this procedure two more times. Then offer for recycling if available or reconditioning if appropriate, or puncture and dispose of in a sanitary landfill or by other procedures approved by state and local authorities.

For information or in an emergency, call 1-800-347-8272 or visit our website:

Manufactured for: Central Garden & Pet Company, 1501 East Woodfield Road, 200W, Schaumburg, Illinois 60173

NOTE: This specimen label is for informational purposes only. All uses may not be approved in all states. See product labeling for use directions.

Inhibidor and Starbar with design are trademarks of Wellmark International.

© 2021 Wellmark International.

Schaumburg, IL

December, 2021

FR 22-002

NET CONTENTS: 2.5 GAL (9.46 L)

CPN: 1093037.0

General Inquires:   800-877-6374
Fax:   800-426-7473
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.


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