Baterial leaf spot of mango

mango diseases

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

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

3. 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.

4. 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.

5. Peritrichous Flagella

6. 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.

7. Streptomycin

8. Copper based fungicides

9. THANKS TO ALL. GOOD LUCK