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Reaction of Some Potato Germplasm Against Stem Canker and Black Scurf Disease Under Natural Infection in the Field

M. M. Rahman
PSO
Tuber Crops Research Sub-Center, BARI, Bogura, Bangladesh

M. A. Ali
Professor
Department of Plant Pathology, BAU, Mymensingh, Bangladesh

T. K. Dey
Director
Pulses Research Centre, BARI, Ishurdi, Pabna, Bangladesh

M. R. H. Mondol
Senior Scientific Officer
TCRSC, BARI, Bogura, Bangladesh

K. M. Khalequzzaman
Principal Scientific Officer (Plant Pathology)
Spices Research Centre (SRC), Bangladesh Agricultural Research Institute (BARI), Shibganj, Bogura, Bangladesh

Abstract/ Executive Summary:

The experiment was conducted at Tuber Crops Research Sub-Centre, BARI, Bogra during 2007-2008 to evaluate the reaction of some potato germplasm against stem canker and black scurf of potato under natural infection in the field. Nineteen potato germplasm such as V-4, Quincy, Billini, Meridian, Raja, Innovator Lady Rosetta, Diamant, Lalpakri, Courage, Heera, Ajiba, Cardinal, V-36, BARI-TPS-1, Daifla, Asterix, Felsina and Granola were evaluated. Among the germplasm, only three (Raja, Heera and BARI-TPS-1) were found to be moderately resistant, eight germplasm were (V-4, Quincy, Billini, Lady Rosetta, V-36, Courage, Daifla, Lalpakri) were moderately susceptible and two were susceptible to Rhizoctonia solani.

Keywords: Potato, Disease reaction, Black scurf, Stem canker,

Location: Tuber Crops Research Sub-Centre, BARI, Bogura

Start Date: 01-10-2007

End Date: 30-04-2008

Program Area: Variety and Species

Commodity: Diseases, Potato

Objectives:

To assess the reaction of some potato cultivars against stem canker and black scurf of potato in natural infection in the field.

Methodology:

The experiment was conducted during 2007-2008 cropping season at Tuber Crops Research Sub-Centre, BARI, Bogra. Seed tubers of different germplasm were collected from Breeder Seed Production Centre, Debigonj, Panchagarh. Nineteen potato germplasm were included under the study. The experiment was conducted in previously Rhizoctonia solani infested soil. The experiment was set up in randomized complete block design with three replications. Block to block and plot to plot distance was 100 cm and 50 cm respectively. Row to row distance and tuber to tuber distance was 60 cm and 25 cm, respectively. Each plot had three rows, twelve seed tubers were sown in each row. Recommended doses of fertilizers and manures were applied as suggested by Tuber Crops Research Centre, BARI, Gazipur (Anon. 2007). Seed tubers were planted on 27 November 2007 maintaining 25 cm seed to seed distance. The 2nd half of urea was applied at 30 days after planting (DAP). Weeding was done at 25 DAP and earthing up was done at 30 DAP. Irrigation was applied at 20 and 40 DAP. The insecticides Dursban 50 WP (Chloropyrifos) @ 0.5% and Admire 200 SL (Imidacloprid) @ 0.1% were applied respectively, to control cutworms and aphids. Secure 600 WG (Pyrimunamined) @ 0.1% was sprayed at 10 days interval as preventive measures against late blight disease of potato. The crop was harvested on 24 February 2008. Data on germination, number of stem per hill, plant height were recorded from the field. After harvest, data on healthy and infected tubers were collected. The black scurf infected tubers were separated into three groups such as russet, deformed and sclerotia infected. Number and weight of tubers under each group were recorded. Number and weight of healthy tubers harvested from each plot were also recorded. Disease related data such as incidence, percent disease index (PDI), tuber infection and yield were collected. To record disease incidence, 20 plants were randomly selected from each unit plot at 70 DAP, uprooted carefully, washed with running tap water and checked for infection. At 70 DAP, severity of stolon infection was indexed on a 0-6 indexing scale (Bakr et al. 2010), where 0 = No symptom on stolon, 1 = minute brown lesion on stolon or root, 2 = moderately brown lesion on stolon and curling tendency on central leaf, 3 = stolon symptom discolored accompanied by brown discoloration on roots, 4 = brown to black discoloration on underground parts, tissue discoloration and curling of growing leaves, 5 = profuse emerging of auxiliary leaves, leaf size reduced markedly and pale green on leaf margin, and 6 = production of aerial tuber with green color. Twenty plants in each plot were randomly selected and uprooted carefully from soil, washed with water. The plants were checked individually and severity of stolon infection was indexed. Number of stem canker infected plants under each grade (0-6 scale) was recorded and the percent disease index (PDI) was calculated using the following formula: (Singh 1984).

Source of Information: Int. J. Sustain. Crop Prod. 10(4):17-22 (November 2015); ISSN-1991-3036 (Online)

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The results reveal that none of the potato germplasm showed of resistance reaction to R. solani. Only three, Raja, Heera, and BARI-TSP-1 showed moderately resistant reaction to stem canker and black scurf disease.

Knowledge Management: Journal