This document discusses several diseases that affect sweet orange trees, including Tristeza, Citrus Scab, Citrus Canker, Anthracnose, Citrus greening, Phytophthora gummosis, Citrus Chlorotic dwarf virus, and Pseudocercospora Fruit and Leaf Spot. Citrus Canker is a serious bacterial disease that reduces fruit growth and causes leaves to drop and fruit to fall prematurely. Citrus greening causes mottling and yellowing across leaf veins and can kill trees if not reported. Phytophthora gummosis commonly causes dark exudate from tree bark and can stunt or kill trees.

2. Sweet Orange Diseases
A
Lecture To ToT trainees ( FFS)
By
Mr. Allah DadKhan
Provincial Coordinator IPM
KPK
MINFAL Pakistan

4. Tristeza

5. Tristeza

6. Tristeza

7. Tristeza

8. Citrus Scab

9. Citrus Scab

10. Citrus Scab

11. Citrus Scab

13. Citrus Canker
 Citrus canker is a serious bacterial disease of citrus trees including
grapefruit, lemons, limes and oranges. It reduces the growth of new fruit and
spoils healthy fruit. Outbreaks of this disease have been eradicated from
Queensland and the Northern Territory at great cost to industry and growers.
 The disease attacks the leaves, twigs and fruit of citrus trees. It causes the
leaves to drop and fruit to fall to the ground before it ripens. People may also
contribute to disease spread by moving infected plants or plant parts

14. Citrus Canker

15. Citrus Canker

16. Citrus Canker

17. Citrus Canker

20. Anthracnose

21. Anthracnose

22. Citrus greening
Identification tip:
 Mottling and yellowing that
cross leaf veins help to
distinguish citrus greening
(Huanglongbing), an exotic
tree-killing bacterium. When
zinc deficiency is the cause,
discoloring occurs between
distinctly greener veins.
Report to agricultural
officials any finding citrus
greening disease

23. Huanglongbing( HBL)Citrus Greening)

24. Huanglongbing( HBL)Citrus Greening)

25. Huanglongbing( HBL)Citrus Greening)

26. Phytophthora gummosis
Identification tip
 :Phytophthora
gummosis is the most
common cause of
profuse dark exudate
from bark. Several other
limb, trunk, and root
diseases cause oozing
bark and can stunt and
sometimes kill trees.

27. Phytophthora gummosis

28. Phytophthora gummosis

29. Phytophthora gummosis

36. Citrus Chlorotic dwarf virus

37. Citrus Chlorotic dwarf virus

38. Citrus Chlorotic dwarf virus

39. Pseudocercospora Fruit and Leaf Spot

40. Pseudocercospora Fruit and Leaf Spot

41. Pseudocercospora Fruit and Leaf Spot

42. Pseudocercospora Fruit and Leaf Spot