INTEGRATED MANAGEMENT OF SHEATH BLIGHT (Rhizoctonia solani Kuhn) OF RICE.
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Date
2019-07-15
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CSKHPKV, Palampur
Abstract
The investigation on “Integrated management of sheath blight (Rhizoctonia solani Kuhn) of rice” was undertaken during 2017-19 in the Department of Plant Pathology, CSK HPKV, Palampur. Sheath blight pathogen was isolated from infected rice plants and pathogenicity was proved. Among six organic amendments, Jeevamrit and Neem Cake gave cent per cent mycelial growth inhibition of the Rhizoctonia solani at ≥ 15 and 30 per cent concentration, respectively by poisoned food technique. In vivo Neem Cake gave maximum disease control with 55.17, 52.94 and 50.00 per cent reduction in disease incidence and 40.49, 38.85 and 35.33 per cent reduction in disease severity at maximum tillering, booting and panicle formation stages, respectively followed by Jeevamrit. In vitro, Bavistin 50 WP (at ≥ 25 ppm), Nativo 75 WG (≥ 50 ppm), Vitavax 75 WP (≥ 100 ppm) and Raxil 250 EC at 250 ppm concentration gave cent per cent inhibition of R. solani. Bavistin 50 WP (0.1 %) was found to be most effective both as seedling root dip treatment with 64.52 and 51.27 per cent reduction in disease incidence and severity and foliar sprays with 70.59 and 85.93 per cent reduction in incidence and severity of ShB, respectively at maximum tillering stage and similar pattern of effectivity was observed at booting and panicle formation stages. Among 50 genotypes of rice screened under artificial infection conditions 14 genotypes were found to be resistant while 16 genotypes were moderately resistant. In compatibility studies T. harzianum (TH-4) showed complete compatibility with Raxil 250 EC at 1 ppm and moderate compatibility up to 7 ppm while all the bioagents viz., T. koningii (DMA-8), T. harzianum (TH-4), T. viride, T. harzianum (TH-11), T. harzinum (Isolate-7) and T. harzianum (Isolate-8) showed complete incompatibility with Bavistin 50 WP at all the concentrations (1-20 ppm). The integrated treatment T9 (soil amendment with Neem Cake + seedling root dip treatment with Bavistin 50 WP + foliar application of T. harzianum (TH-4) + foliar application of Raxil 250 EC) was found to be most effective in reducing disease incidence (64.56, 63.76 and 59.45 %) and severity (69.24, 66.27 and 66.31 %) at three crop stages (maximum tillering, booting and panicle formation), respectively.
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