Biological Management of Common Scab (Streptomyces scabiei) of Potato

Abstract

At the Potato Research Station, S. D. Agricultural University, Deesa, Gujarat (India) a field experiment was carried out from 2019–20 to 2021–22 to assess the effectiveness of the three most widely used bioagents against the potato common scab. Five distinct treatments were assessed: T1 seed treatment with Trichoderma viride and soil application of Trichoderma viride enriched FYM; T2 seed treatment with Pseudomonas fluorescens and soil application of Pseudomonas fluorescens enriched FYM; T3 seed treatment with Bacillus subtilis and soil application of Bacillus subtilis enriched FYM; T4 seed treatment and soil application with boric acid and T5 served as the control. The pooled data result showed that T4 i.e. seed treatment and soil application with boric acid, had the lowest disease incidence and severity (33.95% & 38.67%) of common scab. This was found at par to T3 (39.06% & 44.40%) which involved seed treatment with Bacillus subtilis and soil application with Bacillus subtilis enriched FYM. Next best treatment was T2 (47.04% & 46.93%), which was seed treatment with Pseudomonas fluorescens and soil application with Pseudomonas fluorescens enriched FYM. There was no significant difference between treatments in terms of tuber yield (t/ha).