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Survey on the Incidence and Severity of Common Scab of Potato in Bangladesh

NAJMUN NAHER
Departmnent of Botany, Life & Earth Science group, National University, Gazipur

MOHAMMAD HOSSAIN
Tuber Crop Research Centre, Bangladesh Agricultural Research Institute, Gazipur

M . A . BASHAR
3Department of Botany, University of Dhaka, Dhaka

Abstract/ Executive Summary:

A survey on the incidence and severity of common scab ( Streptomyces sp.) of potato was made in the major potato growing districts of Bangladesh during the cropping season of 2007-2008. A total of 150 fields was surveyed for collection of potato common scab infected samples. It was observed that there was a lot of variation in disease severity and its incidence in different districts of Bangladesh. Highest per cent scab incidence (71.41 %) was recorded in Kahalo Upazila (Bogra) and lowest (13.79 %) i n Pirgacha Upazila (Rangpur). Disease incidence also varied among the tested varieties namely , Cardinal, Diamant, Granola, Binella and Raja. Highest incidence was observed in Cardinal (54.08 %) followed by Binella (50.71 %) and it was lowest in Raja (3.07 %). Cardinal and Binella were found to be highly susceptible and Raja was resistant to common scab disease. Diamant, the commercial variety showed medium susceptible reaction to the disease.

Keywords: Survey, Incidence, Common scab, Potato, Bangladesh

Location:

Start Date:

End Date:

Program Area: Pest Management

Commodity: Potato

Objectives:

The present investigation was undertaken to study the regional variations on the disease incidence, severity and susceptibility of common scab disease of commercially cultivated potato in Bangladesh.

Methodology:

Fifteen Upazilas, three from each district of Bogra, Rangpur, Rajshahi, Munsiganj and Comilla were selected for the survey. The Upazilas and districts located into eight different Agro-ecological zones of Bangladesh (Anonymous 2005). The disease incidence (DI), disease severity (DS) and percentage of disease index (PDI) were recorded during the potato harvesting season of December 2007 to February 2008. Disease incidence was calculated on the basis of number and weight of infected tubers and it was expressed in percentage. Disease severity was recorded based on the symptom as shown on the surface of the tuber. One hundred tubers were selected randomly , categorized into 0-5 scale (Liu et al. 1995) and finally percentage of disease incidence was calculated following the formula of Goswami et al. (2002). Disease severity was recorded according to disease severity rating scales where 0 = No symptom, 1 = Very small lesions, 2 = Small superficial lesions, 3 = Periderm broken, 4 = Light pitted and 5 = Deep pitted.

Source of Information: J. Asiat. Soc. Bangladesh , Sci. 39(1): 35-41 , June 2013

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Among the surveyed districts the highest scab incidence was recorded in Bogra (62.81 %) and lowest in Rangpur (28.86 %). The scab incidence was 51.14, 38.3, and 32.49 % in Rajshahi, Comilla and Munsiganj respectively. The highest percentage of disease index (POI) was also recorded in Bogra (22.75 %) followed by Comilla (20.36 %), Rajshahi (20.l l %) and Munsiganj (10.16 %). Lowest PDI was recorded in Rangpur (8.76 %).

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