Insects pt 3 Flashcards
Cochliomyia hominivorax common name
screwworm
Cochliomyia hominivorax Host
Livestock
Cochliomyia hominivorax ID
- 10mm, bluish green flies
- Three stripes on thorax
- orange brown eyes
Cochliomyia hominivorax life cycle
- Larvae feed invasively on living tissue
- Adult females mate only once in entire life
Cochliomyia hominivorax site of infection
- eggs laid on fresh
- uninfected wounds
Cochliomyia hominivorax Pathogenesis/lesions/CS
- fresh wound attracts female flies
- Foul smelling lesion
- rapidly leads to death of host
Cochliomyia hominivorax Diagnosis
- Recognition of maggots in lesions
- Must report to vet authorities immediately
- Place dipteran larvae in alcohol
Cochliomyia hominivorax Treatment and prevention
- treat wounds
- releasing sterile males
Cochliomyia hominivorax Recent development
- 7/13/16 start of outbreak
- affected: key dear from a wildlife refuge in big pine key FL
- More than 30 years from the last known outbreak
Sarcophagidae common name
Flesh flies
Sarcophagidae host
any animal
Sarcophagidae ID
-adult 2x the size of houseflies
Sarcophagidae Life cycle
- F lay 1st instars in sores, wounds, necrotic tissue, wool soiled with feces or urine
- Develop to 3rd instars and leave host to pupate
- Pupae-overwintering stage
Sarcophagidae sites of infection
- skin
- wool
Sarcophagidae Diagnosis
Fly ID
Sarcophagidae treatment and prevention
- prevent situations that attract flies
- sanitation
- improved husbandry
- tail docking
- treat wounds immediately
Insect: Lice (Phthiraptera) life cycle
E-N-N-N-E
- entire life cycle on host
- Host specific
Lice (Phthiraptera) suborder Ischnocera (mallophage) morphology
- Biting, chewing lice
- Head>thorax
- Feed on skin, hairs, feathers, other organic materials
- 3mm yellow
- rapid movement to move over skin and covering
Trichodectes canis common name
- dog biting louse
- canine chewing louse
Trichodectes canis host
dog
Trichodectes canis ID
- yellowish color
- Biting/chewing mouthparts
- active louse
- adults 2mm
Trichodectes canis life cycle
- Females lay eggs
- Develop to nymphs and adults
- require host to complete life cycle
Trichodectes canis sites of infection
- hair
- skin
Trichodectes canis pathogenesis and lesions:
- vector of D. caninum
- heavy infestations in neglected and underfed animals
- affects young
Trichodectes canis CS
- Pruritus
- Dogs scratch
- cause loss of hair
- restless and scratch continuously
Trichodectes canis Diagnosis
ID of louse
Trichodectes canis treatment and prevention
- avoid direct contact with brushes, combs and blanlets
- MCL
Felicola subrostratus common name
cat biting louse
Felicola subrostratus host
cats
Felicola subrostratus ID
- Beige or yellow color
- Transverse brown bands
- Triangular anterior portion of the head
- small legs
- 1-1.5mm
Felicola subrostratus predilection site
- Skin
- face
- pinnae
- back
Felicola subrostratus Pathogenesis:
- elderly or chronically ill animals
- Longhaired breeds
Felicola subrostratus Diagnosis:
Louse ID
Damalinia bovis common name
cattle biting louse
Damalinia bovis hosts
cattle
Damalinia bovis ID
- typical ischnoceran
- reddish brown color
Damalinia bovis site of infection:
-head, poll, neck, shoulders, rump, tail switch
Damalinia bovis life cycle (favorable season):
- winter favors proliferation
- Thick coat
- cattle housed
- parthenogenesis
Damalinia bovis life cycle (non-favorable season)
- In summer louse numbers are low
- Thin pelage limits sheltered habitat
- Skin surface temp high
- Sunlight is leathal
Damalinia bovis pathogenesis/lesions/CS
- chronic dermatitis
- in large numbers intensive irritation and pruritus
- Sign of malnutrition of chronic disease
Damalinia bovis Diagnosis
ID of louse
Damalinia bovis Treatment and prevention
- various ectoparasiticides
- MCLs
Damalinia ovis common name:
-Bitting louse of sheep
Damalinia ovis host
- sheep
- goats
Damalinia ovis ID
-typically Ischnoceran
Damalinia ovis life cycle
typical louse
Damalinia ovis site of infestation
wool over whole body
Damalinia ovis pathogenesis and lesions/CS
- most pathogenic of all sheep lice
- highly active
- Lose body condition
- Damage to fleece
- Attractant for blow flies
Damalinia ovis diagnosis
-Louse ID
Damalinia ovis treatment and prevention
-several remedies effective
Damalinia caprae common name
red louse
Damalinia caprae hosts
- goats
- all others similar to Damalinia ovis
Ischnocera (avian lice) common name
biting chewing lice
Ischnocera (avian lice) hosts
Domestic and wild fowl
Ischnocera (avian lice) ID
> 40 species, typical Ischnoceran
Ischnocera (avian lice) site of infestation
note common name I.E., wing louse, Fluff louse
Ischnocera (avian lice) pathogenesis and lesions/CS
- Lice digest Keratin, bite feathers
- Effects of pediculosis similar among host species
- Sleeplessness, inappetence, scratching, feather plucking
- Secondary effects may be more serious than the immediate damage of lice
Ischnocera (avian lice) Diagnosis
Identification of louse
