blackleg of potato disease
TRANSCRIPT
![Page 1: Blackleg of potato disease](https://reader035.vdocument.in/reader035/viewer/2022081605/58d125691a28ab2a738b6399/html5/thumbnails/1.jpg)
Blackleg of PotatoMuhammad Ammar
![Page 2: Blackleg of potato disease](https://reader035.vdocument.in/reader035/viewer/2022081605/58d125691a28ab2a738b6399/html5/thumbnails/2.jpg)
• Introduction Potato blackleg is a bacterial disease caused by the bacterium Pectobacterium atrosepticum. It is early potato disease and symptoms can be seen in early June
Infected Plant
![Page 3: Blackleg of potato disease](https://reader035.vdocument.in/reader035/viewer/2022081605/58d125691a28ab2a738b6399/html5/thumbnails/3.jpg)
•Casual agent
The bacterium Pectobacterium atrosepticum
Causal Agent Under Microscope
![Page 4: Blackleg of potato disease](https://reader035.vdocument.in/reader035/viewer/2022081605/58d125691a28ab2a738b6399/html5/thumbnails/4.jpg)
Pathogen Biology:A Gram-ve , rod-shaped
bacterium. Carried by contaminated seed tubers.
Cause disease when environmental
conditions are favorable.
![Page 5: Blackleg of potato disease](https://reader035.vdocument.in/reader035/viewer/2022081605/58d125691a28ab2a738b6399/html5/thumbnails/5.jpg)
Alternate Hosts
Lambs QuartersParslaneMallow
![Page 6: Blackleg of potato disease](https://reader035.vdocument.in/reader035/viewer/2022081605/58d125691a28ab2a738b6399/html5/thumbnails/6.jpg)
Symptoms Stems : •Stem of potato plants appear pale green or yellow.•At ground level, these affected stems appear black and rotted.Leaves: •Leaves at the top of affected stems may be small and have margins curled inward.Tubers:•In tuber , the flesh may be grey or brown and rotten.
![Page 7: Blackleg of potato disease](https://reader035.vdocument.in/reader035/viewer/2022081605/58d125691a28ab2a738b6399/html5/thumbnails/7.jpg)
Effected Stem
![Page 8: Blackleg of potato disease](https://reader035.vdocument.in/reader035/viewer/2022081605/58d125691a28ab2a738b6399/html5/thumbnails/8.jpg)
Infected Tubers
![Page 9: Blackleg of potato disease](https://reader035.vdocument.in/reader035/viewer/2022081605/58d125691a28ab2a738b6399/html5/thumbnails/9.jpg)
Rotten Brownish Flesh
![Page 10: Blackleg of potato disease](https://reader035.vdocument.in/reader035/viewer/2022081605/58d125691a28ab2a738b6399/html5/thumbnails/10.jpg)
Disease Cycle and Epidemiology• High soil temperatures and physical attack on seed
tubers, favor seed-piece decay.
• RH - 94 to 100% & temp - 21 to 29oC
• The blackleg bacterium survives poorly in soil.• The seed tuber is the most important source of
inoculum in the blackleg disease cycle.• The blackleg bacterium does not survive very
well outside of association with host plant tissue.
![Page 11: Blackleg of potato disease](https://reader035.vdocument.in/reader035/viewer/2022081605/58d125691a28ab2a738b6399/html5/thumbnails/11.jpg)
Disease Cycle
![Page 12: Blackleg of potato disease](https://reader035.vdocument.in/reader035/viewer/2022081605/58d125691a28ab2a738b6399/html5/thumbnails/12.jpg)
Management•Plant only certified, disease-free seed tubers
•Seed treatment
•Streptomycin sulphate 0.1 % for 10 min
•Streptocycline ( 100 ppm) and copper sulphate
( 40 ppm) for 30 min.
•Removal and destruction of infected plants as soon as symptoms are noticed.•Rotation also reduces the risk of infection arising from infected potatoes