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Myiasis Producing Flies (view source)
Revision as of 14:53, 10 November 2008
, 14:53, 10 November 2008no edit summary
*After 3 months larvae reach '''winter resting sites''' where they remain from November to Feburary/March whilst moulting to the L2 stage
*After 3 months larvae reach '''winter resting sites''' where they remain from November to Feburary/March whilst moulting to the L2 stage
**Epidural fat in the spinal canal for ''H. bovis''
**Epidural fat in the spinal canal for ''H. bovis''
**Wall of the oesophagus for ''H. lineatum''
**Wall of the [[Oesophagus - Anatomy & Physiology|oesophagus]] for ''H. lineatum''
*Larvae then migrate back to the subcutis along the midline of the back where they bore a breathing hole through the skin and moult to the L3 stage
*Larvae then migrate back to the subcutis along the midline of the back where they bore a breathing hole through the skin and moult to the L3 stage
**Toxin release
**Toxin release
**Pressure on the spinal cord (''H. bovis'')
**Pressure on the spinal cord (''H. bovis'')
**Bloat from pressue on the oesophageal wall (''H. lineatum'')
**Bloat from pressue on the [[Oesophagus - Anatomy & Physiology|oesophageal wall]] (''H. lineatum'')
'''Control'''
'''Control'''
*Larvae are squirted into the nostils of sheep in a jet of liquid
*Larvae are squirted into the nostils of sheep in a jet of liquid
*The larvae crawl caudally into the nasal cavity and feed on the nasal mucosa and mature before returning to the nostrils
*The larvae crawl caudally into the [[Nasal cavity - Anatomy & Physiology|nasal cavity]] and feed on the nasal mucosa and mature before returning to the nostrils
*Larval development takes up to two months
*Larval development takes up to two months
**Larvae can overwinter in the nasal cavity if deposited late in the summer
**Larvae can overwinter in the [[Nasal cavity - Anatomy & Physiology|nasal cavity]] if deposited late in the summer
*Once the larvae have developed they are sneezed out and pupate on the ground
*Once the larvae have developed they are sneezed out and pupate on the ground
***Eggs laid in the intermandibular area
***Eggs laid in the intermandibular area
*''G. haemorrhoidalis''
*''G. haemorrhoidalis''
***Eggs laid around the lips
***Eggs laid around the [[Lips - Anatomy & Physiology|lips]]
*Larvae crawl into the mouth and penetrate the tissues of the buccal mucosa which takes a few weeks
*Larvae crawl into the mouth and penetrate the tissues of the buccal mucosa which takes a few weeks
*Larvae then emerge and are swallowed
*Larvae then emerge and are swallowed
*Larvae pass into the stomach and attach to the gastric mucosa
*Larvae pass into the [[Forestomach - Anatomy & Physiology|stomach]] and attach to the gastric mucosa
**Larvae are now known as '''bots'''
**Larvae are now known as '''bots'''
**''G. nasalis'' attaches to the pylorus
**''G. nasalis'' attaches to the pylorus
*After 10-12 months in the stomach, the larvae detach and are passed out in the faeces
*After 10-12 months in the [[Forestomach - Anatomy & Physiology|stomach]], the larvae detach and are passed out in the faeces
**''G. haemorrhoidalis'' attaches to the rectal mucosa before being passed out
**''G. haemorrhoidalis'' attaches to the rectal mucosa before being passed out
'''Control'''
'''Control'''
*Treatment of horses with [[Ectoparaciticides|insecticides]] over winter
*Treatment of horses with [[Ectoparaciticides|insecticides]] over winter
**Breaks the life cycle as all the population are present as bots in the stomach
**Breaks the life cycle as all the population are present as bots in the [[Forestomach - Anatomy & Physiology|stomach]]
*If eggs are present in late summer, the horse's coat can be sponged with an [[ectoparasite|insecticide]]
*If eggs are present in late summer, the horse's coat can be sponged with an [[ectoparasite|insecticide]]