3. Name
• Common Name:
Citrus Psylla
• Technical Name:
Diaphorina citri
• Famil:
Psyllidae
• Order:
Hemiptera
4. Introduction
The Citrus Psylla is a sap sucking insect .
Its belong to Psyllidae family .
It is an important pest of citrus .
It is widely distributed in southern Asia and has spread to
other citrus growing region .
5. Identification
The insect is brown with
its pointed head.
The nymphs are flat,
louse like and orange
yellow.
Congregates in numbers
on the young leaves and the
buds.
8. 3-4 mm ( 0.12-0.16 in.) in length.
Mottled, yellowish-brown body with brown legs and a light brown head
Abdomen of females turns bright yellow-orange when ready to lay eggs.
Transparent Wings with white spots, or light-brown with a central being
band.
Very short antennae ( 0.48mm ( 0.07 in.)}, eight yellow segements , and
two shorts hairs at tip.
9. Five nymphal instars.
0.25 mm-1.7 mm ( 0.01-0.07 in.) in length.
Light yellow to dark brown.
Red eyes.
Well- deweloped, large wing pads.
10. Approximately 0.01 –
0.15 ( less than 0.005
in.).
Bright yellow –
orange .
Almond-shaped,
thicker at the base , and
taper toward the
opposite end.
11.
12.
13. Eggs are laid on tips of growing shoots on and between
unfurling leaves.
Females may lay more than 500 almond shaped eggs during
their lives.
The total life cycle requires from 15 to 47 days, depending
upon the season.
Adult may live for several months. But population are low in
winter.
The Whole development cycle takes from two to seven weeks
depending on the temperature and the time of year.
14.
15. Damage
Young fruits often drop.
Citrus psyllids are a vector of citrus greening disease, adisease that causes misshapen,
bitter fruit, ultimately kills the tree.
Citrus psyllids inject a toxin which stops shoot elongation and deforms leaves and shots .
Severely curled leaves , premature defoliation is common .
Twenty –four hours of feeding by a psyllid can cause permanent deformation.
16. Both nymphs and adults suck sap from the plants and
injection of toxic saliva.
Nymphs - are more destructive, crowd on the terminal
shoots, buds and tender leaves.
Excrete honeydew - growth of sooty moulds.
Affected plant parts dry and die away.
It is transmits the "Greening" virus.
Symptoms of damage
21. Management
Biological:
Diaphorina citri can be controlled with a wide range of
modern insecticides.
Injection of trees with tetracycline antibiotics to control
greening disease.
Natural :
Lady Bird beetle and Green lace wings are important natural
enemies of citrus Psylla.
22. Chemical:
Spray Malathion 0.05% or monocrotophos 0.036%
or Carbaryl 0.1% or methyl parathion 0.05%.
Spray with imidacloroprid SL 40ml/100 of
water.
Endosulfan EC 200ml/100 of water.
Management