M.Shahid Siddique 2012-ag-2094 ssiddique560@gmail.com 03008998805

2. Screening of potato germplasm
against Black Scurf and its
Management
M.Shahid Siddique
2012-ag-2094
8th Semester
B.sc(Hons) Plant Pathology
University of Agriculture, Faisalabad

3. Potato (Solanum tuberosum L.)
 World's fourth-largest staple food, follow by rice, wheat and maize.
World
Annual Production : 381,682,000 (Thousand Tonnes)
(FAO, 2014)
Pakistan
Cultivated Area: 179.3 (Thousand Hectares)
Annual production 3,849.5 (Thousand Tonnes)
(PBS 2016-17)

4. Nutritional Value
Potassium 15.6%
Fiber 15%
Vitamen B5 10.1%
Copper 9%
Vitamen B 38.5 %
Calories (102) 5%
Tryptophan 15.6%

5. Causes of low production
Abiotic Factors
Biotic Factors

6. Infectious Agents of Potato Diseases

7. Potato Fungal Diseases
Early Blight
Black Scurf
Late Blight Powdery scab

8. Incidence caused by Potato Black Scurf
Black scurf is very important disease of potato caused by Rhizoctonia
solani.
World
First observed by Julias Kuhn in 1858.
Pakistan
In Pakistan, it was reported by Geddes in 1989.
Incidence
World
Black scurf can cause 35 % incidence globally.
(Olanya et al., 2009)
Pakistan
65.55 % incidence reported in Punjab zone and 12.82 % incidence in
Northern areas.
(Rauf et al., 2007)

9. OBJECTIVE
 To find out resistant source against Black scurf
 To check the efficacy of chemical against the Black scruf

10.  For disease severity following disease rating scale was used:
0= no symptoms
1= less than 1 % area affected
2= 1-10 % area affected
3= 11-20 % area affected
4= 21-50 % area affected
5= above 50 % area affected
 Whereas
1 = Resistant, 2 = Moderately resistant,
3 = Moderate susceptible, 4= susceptible,
5= Highly susceptible
(Ahmed et al., 1995)

11. Materials and Methods
No of cultivars = 20
Design = Randomized Complete Block
Design
Replications = 20
(Rauf et al., 2007)

12. Data was recorded according to following
parameters:
Disease incidence = No. of infected tubers X 100
Total no. of Tubers
Disease severity = infected Poration X 100
Total Portion

13. In Vivo Management
 Collection of seed
 Treatment
 Chemical

14.  Layout(RCBD)
 Sowing
 Irrigation

15. RESULTS

16. RESULTS
FD 74-38 SL 10-4

17. Effect of Disease on different Cultivars
Cultivars Incidence Severity Reaction
FD 76-78 73.00A 1G R
FD 77-4 1.300 J 1.30 FG MR
FD 73-110 3.200 I 1.90 E MR
SL 11-50 2.900 I 1.70 EF MR
FSD RED 3.60 HI 1.90 E MR
FD 69-1 1.10 J 1.20 G MR
FD 74-38 1.60 J 1.30 FG MR
FD 78-51 3.90 HI 1.70 EF MR
FD 74-33 2.90 I 1.50 EFG MR
FD White 3.60 HI 1.90 E MR

18. Cultivars Incidence Severity Reaction
FD 78-36 3.50 HI 2.70 CD MR
FD 76-35 7.500 F 2.70 CD MS
SL 35-36 5.800 G 2.70 CD MS
FD 10-4 11.10 E 2.90 C MS
FD 78-51 14.70 D 2.70 CD MS
FD 76-67 11.80 E 2.50 CD MS
FD 74-40 4.60 H 2.40 D MS
SL 1-13 7.700 F 2.70 CD MS
FD 8-1 21.30 C 3.40 B S
FD 74-30 30.90 B 3.70 B S
LSD Values 1.18 0.46

19. Reaction of Potato Cultivars
Sr. #
0
Host Status
Resistance
Disease
incidence
0.900
Disease
severity
1
Cultivars
FD 76-78
1
Moderately Resistant
(MR)
1-10 9
SL 11-50,FD 35-25, FD 73-
110, FD 69-1, FD Red,FD
White FD 74-38, FD 77-4 FD
73-38
2
Moderately
Susceptible (MS)
11-20 7
SL 10-4, , FD 76-55, FD
76-35, FD 76-67, FD 78-
36, FD 35-36
3 Susceptible (S) 21-50 2 FD 74-30, FD 8-1
4
Highly Susceptible
(HS)
51 or above 1 SL 9-13

21. M.Shahid Siddique
ssiddique560@gmail.com
+923008998805