The document describes the Asian citrus psyllid (Diaphorina citri), a pest affecting citrus trees across various countries. It details its life cycle, including egg laying, nymph and adult stages, and the damage it causes, such as plant wilting and virus spread. Control measures include biological, chemical, and cultural methods to manage this significant pest.

2.  Ehtisham Ali Hussain
 BAGF15E258
 University College Of Agriculture,
 University Of Sargodha, Sargodha

3. kingdom:
Animalia
Phylum:
Arthropoda
Class:
insecta
Order:
Hemiptera
A Family:
psyllidae
Genus:
diaphorina
Species:
Diaphorina citri

4. Common name:
Asian citrus psyllid
Techanical name:
Diaphorina citri

5. Distribution:
 Afghanistan
 China
 Hong kong
 India
 Indonesia
 Malaysia
 Nepal
 Pakistan
 Mexico

6. Identification:
Eggs
Female lay bright yellow orange, almond shaped eggs on the tips of growing shoots.
The number of laying eggs depends upon host plant .The eggs hatch in about 4 days.
Nymph
The nymph are flat, louse like and orange yellow , congregates in large numbers on
the young leaves and the buds.
Adults
Adults are brownish.
Adults live for 1 to 2 months.
Adult is 3mm long.

8. Life cycle:
 The adults lay 500 almond _shape ,orange and stalked eggs on tender leaves and
shoots of citrus trees
 The eggs are laid either singly or in groups which hatch in one week in the
summer
 There are 5 nymph stages and the development is completed in 2 weeks
 Full grown nymphs migrate to the lower surface of the leaves and convert into
adults
 There are 8_9 overlapping generation in a year

10. Eggs
Adult lay 500 almond shape eggs
nymph
Hatch in 1 week
8_9 gen. per year 5 nymphal stages
adult Development complete in 2 weeks
Full grown nymph migrate.
Convert into adult

11. Damage:
 With the help of their sharp piercing sucking mouthpart they suck the cell sap.
 The vitality of the plants deteriorates and their young leaves and twigs stop
growing further.
 The leaf buds flower buds and the leaves may wilt and die.
 Moreover the nymph secrete drops of a sweet thick fluid on which a black fungus
develops adversely affecting photosynthesis.
 This insect is also responsible for spreading the greening virus.
 If the pest is not checked in time the entire orchard may be lost with in one or two
year of continuous damage,

13. Control:
Biological
 Lady bird beetles and lace wings are important natural enemies of citrus psylla.
 Chemical
 Spray trees with imidacloprid SL 40ml per 100 L of water
 Or endosulfan EC 200ml per 100 l of water
Cultural control
Hand picking