Lecture 5: Flies and Myiasis Flashcards
Flies belong to what insect class
Diptera
Adult flies have __ pair of wings
1
Adult of all species have 1 pair of ___ modified wings
Halteres
What is the purpose of halteres
Balancing organs
Club shaped
Do flies undergo a holometabolous or heterometabolous metamorphosis
Complete holometabolous metamorphosis
What is the complete metamorphosis cycle of flies
Egg—>larvae—> pupa—> adult
oviparous
Eggs hatched outside of parents body
Ovoviviparous
Eggs hatched inside parents body
What does hematophagous mean
blood feeding species with biting mouthparts
What are the 3 main groups of flies (Diptera)
- Nematocera
- Brachycera
- Cyclorrhapha
What are examples of nematocera flies
Mosquitoes, black flies, midges, and sandflies
What are some examples of brachycera flies
Horseflies and deerflies
What are some examples of cyclorrhapha flies
Myiasis:Blowflies, botflies, face flies
non biting: housefly and face fly
biting: stable fly, horn fly, tstete fly, and ked or louse fly
Larvae of which type of fly feed on host animal tissue
Cyclorrhapha
What is myasis
Larvae that feed on host animal tissue
Why are biting flies clinically important
- Painful/irritating disrupt normal behaviors (reduce production)
- Inflammation- pruritis and dermatitis, scratching, rubbing biting
- Severe blood loss
- Pathogens transmitted
What can severe inflammatory reactions to biting flies lead to
Alopecia, secondary bacterial infections, production losses, death
What is the clinical importance of non-biting flies
- Annoy animals and disrupt normal behavior (production losses)
- Spines on mouthparts irritate/damage mucous membranes
- Transmission of pathogens
What is the clinical importance of myiasis
- Tissue destruction
- Obstruction (respiratory passages, GI)
How can a taxonomic ID be achieved
Preserve in 70% ethanol and identify via pictorial keys
What can be done in a comprehensive control program of flies
- Reduce host exposure to adult flies, eliminate eggs/larvae on hosts
- Control existing environmental infestation (all life stages)
- Prevent subsequent re-infestation of host and/or environment
What are some treatment/prevention options for adult flies
- Insecticides
- Oral insect growth regulators (disrupt life cycle)
- Repellants
- Fly masks
- Smudge pots
- Shelter for animals
What are some treatment and prevention options against myiasis
- Insecticides
- Macrocyclic lactones
- Physical removal of host, cleaning and debridement of wounds
How can you treat and prevent horse bot eggs
Scrape eggs off host or apply warm water and insecticide
Permethrin is toxic for what species
Cats
Ivermectin is toxic in some breeds of what species
Dogs
What chemical/drug is not approved for lactating cows
Ivermectin
What are some environmental control methods
- Removal or larval habitat
- Chemical control
- Biological control
- Screens, traps, zappers
- Monitoring
What is the appropriate chemical control for adult flies
Insecticides
What is the appropriate chemical control for larvae
Insecticides, insect growth regulators, smothering agents
What are some biological controls
Parasitoid wasps and bacillius thuringiensis
Parasitoid wasps target what type of pupae
Cyclorrhaphans- house flies, face flies
What are some examples of non-chemical control methods for adult flies
Screens, fly traps, flypaper, zappers
what are some examples for non-chemical control methods for mosquito larvae
Modification of aquatic habitat (source reduction)
What types of mosquitoes afflict mammals, birds, reptiles and amphibians
Aides, anopheles, culex
Culicidae are what type of Nematocera
Mosquitoes
What pathogens are commonly carried by mosquitoes
Canine heartworm, plasmodium spp (malaria), west Nile, EEE, rift valley fever, and feline mosquito bite hypersensitivity
What rare reaction can cats have to mosquitoes
Feline mosquito bite hypersensitivity resulting in exsanguination
Simuliidae are what type of Nematocera
Black flies
What type of black fly commonly feeds on blood of birds and mammals
Simulium
What pathogens can be carried by black flies
- Filiaroid nematodes of equids and ruminants
- leucocytozoon spp of poultry and other birds
- Vesicular stomatitis virus- equids, cattle, swine
what is leucocytozoon
Parasitic Protozoa of poultry and other birds