Pectobacterium Wilt And Blackleg

Question 0

Aymptoms

Answer 0

Basal portion stem blacken- blackleg
Leaves yellow,rolling upward margin,wilt,die- wilt
Stunted while plant
Bacteria solash soil- invade stems,petioles,leaves- aerial stem blackleg
Tuber sprouts decay before emerge

Question 1

Casual agents

Answer 1

Pectobacterium carotovorum carotovorum
Pectobacterium carotovorum brasiliensis
Pectobacterium carotovorum wasabiae
Dickeya dadantii

Gram -

Question 2

Soft rot symptoms

Answer 2

Tubers watery soft rot lesion with bad odour
Bad odour- invasion of sec org
Infected tuber- creamy to tan colou, black border
Clear liquid from exuded from decaying tubers
Whole tuber collapse
Deep pitting of lenticels

Question 3

Softrot biology

Answer 3

High soil moisture
High temp above 20
Dense canopies
Wounds/ stress
Pathogen not survive long in soil without host- seed NB inoculum

Question 4

NB

Answer 4

Bacteria anaerobic- low o2/high co2. Moisture create anaerobic cond

Question 5

Disease cycle

Answer 5

Notes

Question 6

Disease management

Answer 6

Reduce contamination seed tubers- limited generation seed,harvest dry,min tuber damage,cutting eq regularly cleaned

Min disease spread- no water logging,no diseased/damage tubers planted,plant cond fav fir rapid growth,rogue infected plant, remove mother and rotting tubers

Question 7

General management

Answer 7

Tubers at room temp- transport- no condensation
3-4 year crop rotation
Tuber water wah change and disinfectant
No chemicals