Fleas
Download
1 / 26

- PowerPoint PPT Presentation


  • 296 Views
  • Updated On :

Fleas. Insects as Weapons or "Bug Bombs". What are the possibilities?. Insects that sting Insects that carry disease Insects that bite/suck Insects that produce toxic substances Affect food supply. World War II. Japan and the Pingfan Project Plague and fleas

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about '' - LeeJohn


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript


What are the possibilities l.jpg
What are the possibilities?

  • Insects that sting

  • Insects that carry disease

  • Insects that bite/suck

  • Insects that produce toxic substances

  • Affect food supply


World war ii l.jpg
World War II

  • Japan and the Pingfan Project

  • Plague and fleas

  • Mass produced (500 million fleas per year).

  • Released fleas from aircraft

  • Also developed other insect-vectored

  • diseases.


Taxonomic classification l.jpg
Taxonomic classification

  • Phylum: Arthropoda

  • Class: Insecta

  • Order: Siphonaptera

  • Genera:

  • Pulex irritans (human flea) 致痒蚤,亦称人蚤

  • Xenopsylla  cheopis 印鼠客蚤

  • Ctenocephalides canis (dog flea)

  • Ctenocephalides felis (cat flea): the most prevalent of all flea species


Host spectrum l.jpg
Host spectrum

  • Canids(犬科动物), felids(猫科动物), humans, calves, opossums(负鼠), chickens, raccoons(浣熊)(best found on cats, stray dogs and mongoose猫鼬)

  • Host preferential rather than host specific


Geographic distribution l.jpg
Geographic distribution

  • Worldwide - survive best in humid conditions (90% humidity).


Morphology l.jpg
Morphology

  • Adults - 1.5 to 4 mm long, dark brown, laterally flattened, wingless, piercing-sucking mouthparts, genal (on the cheek) and pronotal (on the posterior border of the 1st thoracic segment) combs (ctenidia), rounded head




Slide13 l.jpg

  • 致痒蚤(Pulex  irritans)  亦称人蚤,在眼下方有眼鬃毛1根;受精囊的头部圆形,尾部细长弯曲

  • 印鼠客蚤Xenopsylla  cheopis  眼鬃毛1根,位于眼的前方;受精囊的头部与尾部宽度相近,且大部分呈暗色


Slide14 l.jpg




Slide20 l.jpg

Life cycle about 4 x 2 mm


Life cycle stages l.jpg
Life cycle (stages) about 4 x 2 mm

  • Eggs are laid in the host‘s bed, den 兽穴, etc. (called environmental hot spots); or laid on the host, where they fall off easily because they are not sticky.

  • Larvae feed on dry blood, feces, etc. and may remain in this stage as long as 200 days.


Slide22 l.jpg

  • Pupal stage is the most tolerant stage and can last from 10 days up to 50 weeks as pre-emergent adult, depending on environmental conditions

  • Pre-emergent adults are stimulated to emerge by heat, carbon dioxide, movement (human or pet activity). Without stimuli, emergence will be delayed.

  • Life cycle takes an average of 18-21 days but may take 20 months or more.


Habits l.jpg
Habits days up to 50 weeks as pre-emergent adult, depending on environmental conditions

  • Life span of adult: 1 year, several months when unfed.

  • Breeding places: Eggs are laid in hosts’nest or even hair.

  • Feeding: The larvae take adult fleas’ feces and other organic debris as their food. Both male and female adults are blood suckers. They have relative blood preference.


Habits24 l.jpg
Habits days up to 50 weeks as pre-emergent adult, depending on environmental conditions

  • Thermo-tropism: Fleas prefer warmth.

  • Seasonal distribution: Majority are prevalent from May to October.

  • Activity: They may jump as far as 30-40 cm and as high as 20 cm, but their jumping is not directional. The transmission of flea is performed only by their host.


Fleas and diseases l.jpg
Fleas and Diseases days up to 50 weeks as pre-emergent adult, depending on environmental conditions

  • Causes irritation, scratching, restlessness

  • Vector of Yersinia pestis (plague)

  • Endemic typhus or flea-borne typhus.

  • Intermediate hosts of some tape-worm: Dipylidium caninum, Hymenolepis nana.


Control l.jpg
Control days up to 50 weeks as pre-emergent adult, depending on environmental conditions

  • Eradication of rodents.

  • Eradication of fleas by burning, chemicals.

  • Personal hygiene, rat-proof buildings, and do not let dogs and cats come into the houses.