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20211
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Subject: Microbiology × Author: Aravindharaja, S.T. M × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Validation of biocontrol efficacy of a microbial consortium against Sclerotinia rot of tomato under field conditions of tarai and hilly region of Kumaun
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2021-08) Aravindharaja, S.T. M; Sharma, Anita
    Present study revealed the biocontrol potential of a microbial consortium against a tomato pathogen viz., Sclerotinia sclerotiorum under laboratory and field condition at two locations. Bacterial consortium (consisted of MN8, MA13, AA17 and AA12) @ 1% dose effectively influenced and outperformed with individual bacterial isolates to promote the growth of tomato seedling in a biopriming experiment. Three fungicides namely carbendazim, mancozeb and hexaconazole effectively checked mycelial growth of Sclerotinia sclerotiorum at 500 ppm concentration. Bacterial consortium tolerated all the fungicides up to 500 ppm concentration. Outcome of the compatibility experiment of microbial consortium and fungicides was used to control Sclerotinia fungus using integrated disease management strategy. Percent disease incidence of Sclerotinia stem rot recorded in consortium treated tomato (T2) plants was 34.66 and 37.80%, whereas negative control (T5) showed disease incidence in the range of 60.93 and 65.64% in tarai and hilly regions of Kumaun after 30 days of disease induction. Application of bacterial consortium + carbendazim (T3) recorded 31.88 and 33.92% disease incidence. Two treatments (T2 and T3) showed nearly equal disease incidence as observed under carbendazim (T4) treatment (alone). Under biotic stress, bacterial consortium (T2) has played an effective role in number of growth parameters than consortium + carbendazim (T3), carbendazim (T4) treated and untreated control (T6) at tarai and hilly regions. Bacterial consortium (T2) treated tomato plants showed 1.30, 1.58 and 1.34-fold increase in plant height, number of leaves and leaf area in tarai and in hilly region values and were found in the range of 1.3, 1.49, 1.29 fold greater than control after 30 days of the induction. Above data mentioned, in tarai region bacterial consortium (T2) resulted least % disease incidence and high promotory activity of plant growth than hilly region of Kumaun, Uttarakhand.