How To Control Flies in Dairy Farm

If your farm has cows, you already know how important it is to keep flies off them (and off of your milk). But if you’ve ever tried to control flies on cows without success, don’t despair! Here are some easy ways to keep flies from breeding on your cows and ruining your dairy farm profits! How To Control Flies in Dairy Farm is as easy as knowing how to keep flies out of cows eyes.

What Are the Different Types of Flies?

Flies are a nuisance that can be tough to get rid of. There are many different types of flies, including the common house fly, horse fly and fruit fly. The best way to control flies on cows is to eliminate their food source, which is manure. Dispose of all manure piles and dispose of cow dung at least once every day if possible. Keep water sources as clean as possible by dumping out dirty water after use or installing a clean water system for your cows. Eliminating manure will help keep flies from breeding and reduce their numbers around your dairy farm!

Life Cycle of a Fly

House flies can be a nuisance on dairy farms and the only way to control them is through spraying fly killers or chemicals, which creates an unnecessary environmental hazard. The life cycle of a fly can help you understand how to keep flies off cows naturally. Houseflies generally start as eggs laid in moist soil, manure or decaying organic matter where they hatch and grow into larvae that feed on the bacteria found there. Once mature, they develop into pupae and then finally emerge from their cocoons as fully grown adults. If you want to avoid flies taking over your farm then make sure you keep these areas clean and dry. Regularly cleaning barns, gutters, manure piles or other moist places will also cut down your fly population.

What Attracts Flies?

Learn how to identify, manage and reduce the chance of flies entering your cattle housing. There are many different types of flies that can be found on your cows, the most common are the housefly and blowfly.

Blowflies generally breed on fresh manure piles or waste products close to your farm. These types of insects have a very short life span, less than 2 weeks. Houseflies, on the other hand, can lay up to 2000 eggs at a time and they typically prefer warm/humid climates like Florida or Texas as opposed to colder states like Montana or North Dakota.


Keeping cows healthy and comfortable is essential to keeping flies away. Proper sanitation can help control the fly population by eliminating sources of food, water and shelter for them. In a barn or milking parlor, this means cleaning out manure from stalls every day, scrubbing down the floors with soap and water, using screens on windows and doors to prevent flies from entering, sealing cracks around doors and windows to prevent access and regular use of flypaper. The most important part of controlling flies is not just cleaning up after them but also preventing them from entering in the first place.

If you want to avoid having to clean up after your cows all day long then you should keep them healthy so they can stay clean themselves!

Physical Barriers

Flies are a problem on dairy farms and can cause cows to be uncomfortable and have reduced milk production. There are many ways to control flies including physical barriers, biological controls, and chemical controls.

 One way to physically keep flies out of cows’ eyes is to use a net over their faces while they are being milked. The width and length of net should be large enough that it covers half of her body and wide enough to cover her face, without touching any cow’s eyes. This can be done at milking or during penning periods. Another way is using smooth metal mesh fences that prevent flies from landing on cows heads as well as keeping other flies away from them. Smooth mesh fencing could include rolled up chicken wire, geogrid panels, or plastic coated nylon fence panels, when selecting a barrier material it should not rust. It should also be smooth and preferably reflective so that it reflects sunlight preventing more insects from coming near your cows.

Flies Biological Control

One way to help control flies is by using the biological control method. This entails using natural predators, parasites, and pathogens to keep the fly population down. For example, you can introduce a parasite called Lumpy Skin Disease that can infect and kill flies. Another good way to eliminate flies is by introducing a wasp called Muscidifurax Ornithomyia that eats fly eggs, larvae, pupae and adult flies.

 You can also spray BTI (Bacillus thuringiensis israelensis) to kill maggots and eliminate flies. Bacillus thuringiensis israelensis is a naturally occurring bacterium that kills fly larvae that have ingested it. It does not harm other animals or humans, and will degrade into organic matter if ingested by other animals, making it safe for use around livestock and humans as well. You can get BTI at most gardening stores or agricultural suppliers, and may require a professional to apply it to your farm. Many producers prefer not to use chemicals on their farms so they may want to try natural methods first before resorting to chemicals.

Flies Chemical Control

Chemical control is necessary when the infestation is severe and cannot be controlled by non-chemical means. Insecticide use should be done only when there are enough flies to warrant its use. The most effective insecticides for controlling fly populations are synthetic pyrethroids, organophosphates, and carbamates. These chemicals can also be used in baits and spray formulations. It is important to remember that these chemicals are toxic to mammals, fish, birds, bees and other arthropods such as spiders or mantids.

 There are many products on the market today that claim to control flies, but be wary of claims like these. It is important to remember that while an insecticide will kill flies, it might also kill everything else in its path as well.

Collin Miller

Since 2002, Collin has specialized in the pest control industry. He has a Pest Control and Termite Control Commercial Applicator License. He serves on the Missouri Pest Management Association board of directors as a director at large, and he attempts to provide a personal touch in pest eradication to customers in the Ozarks. When the weather is great, Collin enjoys working in his yard, cooking, and hanging out with family and friends, as well as watching football.

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