Thank you for reading this month's newsletter! This information is intended to be timely and practical for our livestock producers. If you have any questions regarding any information provided, events, or suggestions on topics to be addressed, please reach out to Laura at laura_elmore@ncsu.edu. Be sure to visit our website and our social media sites!

We are approaching the time of year when flies become an issue for your grazing cattle. Horn flies, stable flies, and face flies are certainly a menace to cattle, but can also have underlying economic impacts if not controlled. There are two types of flies that are most prevalent on cattle farms: horn flies and face flies.

Horn flies are around half the size of the average hohouseflyThey have an average life cycle of 10-14 days from egg to adult. These flies suck blood, which can cause irritation and reduce weight gain. Horn flies can also spread infections that can damage udder tissues, affecting the milking ability of cows. Roughly 200 flies per animal are when these flies start to cause economic issues. They are usually found around the back, sides, and poll area of cattle.

Face flies are slightly bigger than average house flies and have a 21-day life cycle. They do not bite but feed on animal secretions so they are typically found in clusters around the eyes, nose, and mouth. The main issue with face flies is damage to these areas, making them more susceptible to diseases such as pink eye. Face flies are the most difficult to control because they are not on the animal very long, and because of the location where they land on the animal.

Once the flies are identified, they can be controlled in numerous ways. Back rubbers and dust bags can be used effectively. These can be purchased ready to use or can be made for materials you likely already have on the farm. Cattle can “self-apply” with these back rubbers and dust bags, but attention must be paid by the producer to ensure that they have adequate amounts of insecticide to maintain control. These should also be used in conjunction with other fly control methods.

Insecticide ear tags are another effective option for fly control. These are tags similar to identification ear tags but have been drenched in insecticides. It is important that these tags not be placed too early, as they may be less effective when flies are most active, in mid to late summer. These tags should also be taken out when flies are less active so resistance to the insecticide is not built up by the flies. It is also important to rotate tags with differing insecticide classes from year to year to decrease the chance of resistance to the insecticide.

Insecticide sprays and pour-ons are other methods of control. These are a little more difficult, as they last around 21 days and will need to be reapplied throughout the season. This will include bringing cattle to a central location at least once a month to apply the insecticide. It is important to remember that most of these methods will need to be used in conjunction with other methods to get effective control over all the types of files mentioned. Once again, the classes of these insecticides need to be varied from year to year to ensure that they remain effective at controlling the flies. A little effort can go a long way when controlling these flies for both the well-being of your animals and your bottom line!

Take care to read all product labels before using fly control products including topical products and fly tags. Some products do have withdrawl times assoiciated.

Highly Pathogenic Avian Influenza (HPAI) has been detected in wild waterfowl off the coast of NC and SC through the USDA's surveillance program. Continue to practice proper biosecurity and keep domestic flocks away from wild birds, waterfowl, or other birds. The current recommendation from NCDA is to keep all flocks in an enclosed area, whether that be inside a coop/run or in a chicken tractor. The main point to keep in mind is that they do not need to have free access to the outdoors in a way that is not protected.


USDA has a great resource around biosecurity measures that can be taken at all times to ensure the health of your flock. Now is a good time to review those resources to know what you can do to keep your birds safe.