mango diseases

2. Presentation No 1.
•Topic:
• Bacterial leaf Spot of Mango.
•Course Tittle:
• Plant Prokaryotes.
• Presented by Muhammad Ismail.
• Presented to Mr.Niamatullah.

3. Disease name:
Bacterial Leaf Spot of Mango.
Causal Organism:
Erwinia mangiferae.

4. Symptoms:
• This disease appears on mango leaves after the monsoon
rains in September producing water soaked spots, which
later on turn dark brown and blackish in colour and are
bounded by veins and veinlets of the leaf.
• With aging bacterial exudate starts depositing on the
necrotic portions, which become some what raised hard
and corky surrounded by clear haloes.
• Petioles are also sometimes infected developing
longitudinal cracks.

6. Pathogen:
• This disease was recorded for the first time in 1961 in sindh.
• The result have been shown that the pathogen (a bacterium)
is a wound parasite having optimum growth temperature of
35C with thermal death point at 55C (which is 5 lower than
that reported by Elliot).
• The bacterium is gram negative.It is mostly single celled and
rarely 2-3 celled occurring in chains.It is non sporing, non
capsulated and motile with peritrichous flagella.

7. Peritrichous Flagella

8. Control:
• All efforts should be made to minimize chances of
injuries.
• Destruction of diseased plant debris.
• Spray with Bordeaux mixture.
• Spray with any other copper based fungicides.
• Spray with streptomycin or other antibiotics.

9. Streptomycin

10. Copper based fungicides

11. THANKS TO ALL.
GOOD LUCK