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“STUDIES ON MANAGEMENT OF SHEATH ROT DISEASE OF RICE”

KrishiKosh

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Title “STUDIES ON MANAGEMENT OF SHEATH ROT DISEASE OF RICE”
M.Sc. (PLANT PATHOLOGY)
 
Creator Kindo, Deepmala
 
Contributor Tiwari, P.K.
 
Subject diseases, rice, biological phenomena, fungi, fungicides, planting, extraction, biological development, heterocyclic compounds, plant extracts
 
Description The present investigation entitled “Studies on management of Sheath rot disease of rice.”was carried out in field experimental site and laboratory of the Department of Plant Pathology, College of Agriculture, IGKV, Raipur, (C.G.).
The pathogen was derived from infected leaf and sub cultures were maintained in PDA medium. The isolated fungus Sarocladium oryzae was identified on the basis of morphological characteristics. Pathogenecity test of the fungus was confirmed by artificial inoculation method with S. oryzae. In pathogenecity test, Initial disease symptoms were most severe on the uppermost leaf sheaths (flag leaf) that encloses the emerging young panicle during the boot stage. Lesions were oblong or irregular oval spots (0.5 to 1.5 × 0.3 to 0.5 cm) with an undulated dark brown margin and gray or light brown centers or sometimes dark reddish brown, diffuse margin, or lesions may from an irregular pattern after seven days of inoculation. The infected panicles were showed large no. of chaffy and discoloured grains. The results of the screening nursery showed that the promising hybrid varieties i.e. VNR-2245, Dhani, IRH-1012, Tej, PAC-835, CORH-3, NP-3114, JRH-5, and national hybrid entries no. IET no. 22346, 22354, 22359, 22362, 22367, 22372, 22373, 22374, 22375, 22376, 22377, 22378, 22321, 22333, 22337, 22338, 22340, 22394, 22395, 22396, 22399, 22400, 22409, 21825,22326, 21832, were recorded for resistant reactions of sheath rot disease under high disease pressure. Where as the scented varieties collected from different Agro climatic zones of Chhattisgarh region showed less disease are Jeera basmati, Tarun bhog, Adanchini, Dhanprasad, Chinnor, Chinishakkar, Taroori basmati, Pusa-83, Pusa-677, Vishnubhog, Bisni, Jeera phool, Londhi, Jaiphoola, Chinor, Gopal bhog, Dujai and Kubrimohar. Among the botanical plant leaf extracts Nilgiri and Neem extracts and the medicinal extracts of Ghritkumari and Pachouli were found best in reducing the mycelia growth of S. oryzae. The results efficacy of indigenous Technology Knowledges (ITKs) indicated that the panchgavya at all concentrations significantly reduced the redial growth of S. oryzae. The commercially
produced IGKV cultures of Trichoderma harzianum and Trichoderma viride were effectively reduced the growth of the pathogen. Whereas under in-vitro evaluation study of test fungicides against S. oryzae, the Hexaconazole 5 SC (Contaf), Propiconazole 25 EC (Tilt), Tricyclazole 75% WP (Beam) and Tebuconazole 250 EC (Folicur) were found best in reducing mycelia growth of the pathogen. Under in-vivo conditions the Hexaconazole 5 SC (Contaf) treatment followed by Tebuconazole 250 EC (Folicur) , Carbendazim 50% WP (Bavistin), Propiconazole 25 EC (Tilt), Saaf [Carbendazim 12% + Mancozeb 63%] and Mancozeb 75% WP (Dithane M-45) treatment significantly reduced the sheath rot intensity and increased the grain yield. In the pesticide compatibility study under in-vitro conditions the test fungicide Hexaconazole 5 SC (Contaf) alone and insecticides combinations. Carbofuran 3% G encapsulated + Hexaconazole 5 SC (Contaf), Chlorpyriphos 20% EC (Tricel) + Hexaconazole 5 SC (Contaf), Carbaryl 50% WP + Hexaconazole 5 SC (Contaf) significantly reduced the sheath rot intensity over control after third spray at maturity of the crop.
 
Date 2016-09-22T12:06:13Z
2016-09-22T12:06:13Z
2012
 
Type Thesis
 
Identifier 119p.
http://krishikosh.egranth.ac.in/handle/1/78347
 
Language en
 
Format application/pdf
 
Publisher INDIRA GANDHI KRISHI VISHWAVIDYALYA, RAIPUR