Diptera - Culicoides, Simulium, Gasterophilus and control Flashcards Preview

Parasitology - Ectoparasites > Diptera - Culicoides, Simulium, Gasterophilus and control > Flashcards

Flashcards in Diptera - Culicoides, Simulium, Gasterophilus and control Deck (26)
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1

What are the biting midges? How big are they?

Culicoides spp

2

What are the distinguishing features of culicoides?

Tiny (1-4mm)
Brown/black body
Mottled wings

3

How do culicoides feed?

Dig holes and feed on free blood

4

Where do culicoides lay eggs?

Damp areas (marsh land, compost)

5

How long is the egg to adult life cycle of culicoides?

3 weeks

6

How many generations of culicoides are there per year?

1-2
But in huge numbers

7

What do culicoides cause?

Sweet itch (allergic response to them)
Irritation, allergic dermatitis
Self-inflifcted rubbing lesions on withers, mane, tail

8

What disease are midges vectors of?

Equine arboviruses:
African horse sickness
Blue tongue
Schmallenberg

9

What is the species of black flies?

Simulium spp

10

What are the distinguishing features of simulium spp flies?

Small (1-4mm)
Brownish/orange stout body
Humped thorax
Clear wings

11

Where do simulium spp lay their eggs?

Require running water
(Rivers, streams)

12

How long does it take for a generation of simulium to form?

4 weeks

13

What do simulium spp cause in ducks and geese?

Leucocytozoon (arctic regions)

14

What is the species of the horse bot fly, in the Oestridae family?

Gasterophilus spp

15

What type of parasites are Gasterophilus spp? When are they active/

Obligate myiasis parasite

16

What are the 3 species of Gasterophilus?

G. intestinalis
G. nasalis (around teeth/nasal cavity)
G. haemorrhoidalis (retum)

17

What are the distinguishing features of Gasterophilus flies and eggs?

Long triangular shaped abdomen
Large barrel shaped eggs with double row of spines

18

How many generations of Gasterophilus intestinalis are there each year? When are the eggs laid and where?

1 generation
Eggs laid in Summer on inner legs, hock and shoulders

19

Describe the life cycle of G.intestanlis

Burrow in tongue
Moult and exit to pharynx
Moult to L2 and cluster in stomach
Moult to L3 and remain to dune
L3 passed into dung in June

20

Do Gasterophilus spp have clinical significance?

Surprisingly little - large red larvae in faeces cause alarm to owner s

21

How is Gasterophilus diagnosed?

Larve in faeces in Spring
Eggs on tips of hairs in Summer

22

How can Gasterophilus be controlled?

Removal of eggs on tips of hairs
MLs - ivermectin, moxidectin

23

What type of management is used for fly control?

Integrated pest management - treat accommodation, fly insecticides, habitat and husbandry, barrier methods (stripes!)

24

What is the main group used as fly insectidcides?

Synthetic pyrethroids (ear tags, spray on, pour on)
Essential oils gain popularity

25

Dung removal in barns can be used to control which species of fly?

Musca domestica
Stomoxys calcitrans

26

How can Culicoides midges be reduced? (What can be removed)

Compost heap