Sudden Death in Backyard Poultry – Consider Black Flies
By Dr. Cindy Bell
Death associated with black flies is usually peracute or acute, occurring within 24 hours in cases of severe swarming. Sudden death may be the only problem noted. When swarmed by black flies, birds may exhibit lethargy, anorexia, ruffled feathers, and petechial hemorrhages on skin. Anemia may or may not be a feature.
Based on the life cycle of these flies, which breed only once during the year, the threat in Kansas for 2018 has likely passed as temperatures have soared and large swarms of adult black flies that emerged this spring have already started to die back. In Southern states, black flies are most severe in the spring and die back by early summer. In Northern states, late spring and early summer can be the peak time.
Barriers (e.g. screens) and mechanical control (fans, fly strips) may be sufficient to protect poultry and other livestock from morbidity and mortality associated with black flies. These methods are often safer than chemical insecticides and are uncomplicated by regulations. Historically, carbaryl (also known as Sevin dust) was used widely in poultry for control of arthropod pests and parasites. Permethrin products are recommended since they are generally safer and not as strictly regulated as carbaryl. (Please note, permethrin is highly toxic to cats!)
References and resources:
- Black flies – USA (Arkansas): Livestock deaths, ProMED mail, International Society for Infectious Diseases, http://www.promedmail.org/post/5732701
- Fly bites causing chicken deaths in central Iowa, Ames Tribune, http://www.amestrib.com/news/20180525/fly-bites-causing-chicken-deaths-in-central-iowa
- Avian Simuliotoxicosis: Outbreak in Louisiana Author(s): Rodney W. Schnellbacher, Kali Holder, Tim Morgan, Lane Foil, Hugues Beaufrère, Javier Nevarez, and Thomas N. Tully, Jr. Source: Avian Diseases, 2012; 56(3):616-620.
- Hall RD, Gerhardt RR. Flies (Diptera) in Medical and Veterinary Entomology, Mullen GR, Durden LA, Mullen G. eds. 2002, Elsevier Science & Technology, p. 127-146.
- Pesticides used for control of poultry insect pests, Mississippi State University Extension, http://extension.msstate.edu/content/pesticides-used-for-control-poultry-insect-pests
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