Full Length Research Paper

Management of common scab (Streptomyces scabies) of potato

M. H. Hossain1 and S. K. Bhowal2*, A. K. M. S. Haque3, A. S. M. M. R. Khan4

Abstract

A field experiment was conducted at OFRD, BARI, Comilla and farmer’s field of Matihara in Barura upazilla under Comilla district during the rabi season of 2013-2014 and 2014-2015 to find out the effect of variety, Boric acid, Liming and poultry refuse for controlling common scab of potato. The potato var. Diamant (BARI Alu-7), Cardinal (BARI Alu-8) and Asterix (BARI Alu-25) were used. Seven treatments i.e. T1 = Tuber of Cardinal (BARI Alu-8), T2 = Tuber of Asterix (BARI Alu-25), T3 = Seed treatment with 3% Boric acid before sporting, T4 = 3% Boric acid as spray at 50 days after planting, T5 = Liming @ 150 kg ha-1 were applied 7 days before planting, T6=Fresh poultry refuse @ 5 t ha-1 were applied 21 days before planting and T7 =Untreated control were used as check in this experiment.  Out of seven treatments Diamant (BARI Alu-7) was used in five treatments (T3-T7). From the research findings it was revealed that in both on-station and on-farm situation, T2 = Tuber of Asterix (BARI Alu-25) and T3 = Seed treatment with 3% Boric acid before sporting gave the best result among all the treatments to control per cent common scab incidence with higher tuber yield followed by T6 = Fresh poultry refuse @ 5.0 t ha-1 were applied 21 days before planting in case of both the consecutive years. The untreated control treatment produced maximum disease incidence and minimum tuber yield in both the years. From cost and return analysis, it was observed that the highest gross return and gross margin were also recorded from the same treatment such as T2 and T3, respectively in case of on station and farmers field in both the years where the minimum gross return and gross margin was obtained from untreated control plots.

Key words: Streptomyces scabies, Incidence, management approach, potato common scab, yield and yield loss.

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