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Welcome
Topic
“Bemisia
tabaci
(sweetpotato
whitefly)”
Contents:-
• Introduction
• Distribution
• Importance
• Appearance
• Life cycle
Introduction
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hemiptera
Suborder: Sternorrhyncha
Family: Aleyrodidae
Genus: Bemisia
Distribution
• Found in worldwide in tropical,
subtropical, and less
predominately in temperate
habitats.
• Firstly discovered in 1894.
• Found from Florida to California
in United State.
• Commonly known as
sweetpotato whitefly
﴿ Two sweetpotato whitefly biocomplex
exist
i. Cotton strain
ii. Poinsettia strain
﴿ Poinsetta strain is first discovered in
Florida greenhouses in 1986, then on
fields crops in 1987, spread to Arizona
b/w 1988 and 1990.
﴿ Sweetpotato whitefly nymph suck
plan sap & excrete covering of sticky
honeydew.
﴿ They transmit viruses, including
lettuce fectious yellows and squash
silver leaf.
﴿ Host ant of this insect may more
than 400 sp.
﴿ Can cause severe damage to melons,
alfalfa, cotton, early-planted
lettuce,cauliflower,broccoli and
eggplant.
﴿ Can cause moderate demage in
citrus, grapes, lettus, sugarpeets,
tomatoes and green beas.
﴿ In california, Annual losses is more
than 100 million during severe
outbreaks.
Appearance
۞ Four-winged insect
۞ 1.5-2.0 mm long
۞ Resemble like tiny moths
۞ White dust or dusty powder
covers the wings
۞ Immature appears tranparent
oval forms, latter developing
two yellow spots about 1/3 of
way along the body.
۞ Eggs are oval shaped
۞ Arranged in semicircle
underside of leaves.
۞ Pupae are opaque yellow
۞ Adult resembles that of
greenhouse whitefly but having
yellow body color
۞ Greenhouse whitefly have white
body color
Life Cycle
₪The development time range
from 15-70 days, dependent
upon temperature and plant
host.
₪Have following stages:
a) Eggs
b) Nymphs
c) Adults
Eggs
 Females lay from 28-300 eggs
depending on host and
temperature.
Egg densities can be as high as
1,200 eggs per square inch.
On cotton, a female lays 81
eggs, on average
Nymphs
The first nymphal stage is called
crawler
last stage is often referred to as
the pupa.
After hatching the crawlers move
a short distance and settle to
feed.
Nymphs are creamy white to
light green and oval in outline
nymphal period lasts about 2-4
weeks
Adults
Adults live b/w 8 and 12
days, depending upon temp.
In California, overwinters on
desert weeds, colonizes in
January and February.
Then migrates to cotton in
April and May.
sweet potato white fly
sweet potato white fly
sweet potato white fly

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sweet potato white fly

  • 1.
  • 4. Contents:- • Introduction • Distribution • Importance • Appearance • Life cycle
  • 5. Introduction Scientific classification Kingdom: Animalia Phylum: Arthropoda Class: Insecta Order: Hemiptera Suborder: Sternorrhyncha Family: Aleyrodidae Genus: Bemisia
  • 6. Distribution • Found in worldwide in tropical, subtropical, and less predominately in temperate habitats. • Firstly discovered in 1894. • Found from Florida to California in United State. • Commonly known as sweetpotato whitefly
  • 7. ﴿ Two sweetpotato whitefly biocomplex exist i. Cotton strain ii. Poinsettia strain ﴿ Poinsetta strain is first discovered in Florida greenhouses in 1986, then on fields crops in 1987, spread to Arizona b/w 1988 and 1990.
  • 8. ﴿ Sweetpotato whitefly nymph suck plan sap & excrete covering of sticky honeydew. ﴿ They transmit viruses, including lettuce fectious yellows and squash silver leaf. ﴿ Host ant of this insect may more than 400 sp. ﴿ Can cause severe damage to melons, alfalfa, cotton, early-planted lettuce,cauliflower,broccoli and eggplant.
  • 9.
  • 10. ﴿ Can cause moderate demage in citrus, grapes, lettus, sugarpeets, tomatoes and green beas. ﴿ In california, Annual losses is more than 100 million during severe outbreaks.
  • 11. Appearance ۞ Four-winged insect ۞ 1.5-2.0 mm long ۞ Resemble like tiny moths ۞ White dust or dusty powder covers the wings ۞ Immature appears tranparent oval forms, latter developing two yellow spots about 1/3 of way along the body.
  • 12. ۞ Eggs are oval shaped ۞ Arranged in semicircle underside of leaves. ۞ Pupae are opaque yellow ۞ Adult resembles that of greenhouse whitefly but having yellow body color ۞ Greenhouse whitefly have white body color
  • 13.
  • 14. Life Cycle ₪The development time range from 15-70 days, dependent upon temperature and plant host. ₪Have following stages: a) Eggs b) Nymphs c) Adults
  • 15. Eggs  Females lay from 28-300 eggs depending on host and temperature. Egg densities can be as high as 1,200 eggs per square inch. On cotton, a female lays 81 eggs, on average
  • 16.
  • 17. Nymphs The first nymphal stage is called crawler last stage is often referred to as the pupa. After hatching the crawlers move a short distance and settle to feed. Nymphs are creamy white to light green and oval in outline nymphal period lasts about 2-4 weeks
  • 18.
  • 19. Adults Adults live b/w 8 and 12 days, depending upon temp. In California, overwinters on desert weeds, colonizes in January and February. Then migrates to cotton in April and May.