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20131
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Subject: Plant Pathology × Author: Gairola, Kalpana × Start date: 2000 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Drechslera blight of soybean: Symptomatology, etiology and management
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2013-06) Gairola, Kalpana; Dubey, K.S.
    Drechslera blight of soybean caused by Drechslera glycini is widely distributed in warm and humid areas, especially in the tropics and it causes heavy losses (quantitatively and qualitatively). Under artificial inoculated conditions brownish spots were observed on leaves near the leaf margin with light brown centre and dark brown margin. and brownish discoloration were observed on hypocotyls and cotyledons. Seven media were tested for the growth of the Fungus, wherein, Oat meal agar was best for growth as well as sporulation of the test fungus. The pathogen grew best at pH 7 and 350C temperature. In-vitro antagonistic potential of six fungal and three bacterial bioagents wherein T. harzianum showed as potential strong potent bioagent against D. glycini. Among eight organic matters amended soil extracts tested, Press mud was found most effective against test fungus. Out of eight organic matter amended soils, inoculated with the test pathogen, Press mud was found most effective and gave highest seed germination. Tea waste was found best for nodulation and Press mud showed least disease severity as well as minimum preemergence mortality. while the post emergence mortality was found least in Bannana peel amended soil. Among eight Botanical extracts tested for their antifungal property, Ginger was found most effective. Out of Nine fungicides tested in which Tabuconazole gave maximum control of the test pathogen and Tridemefon, Thiophanatemethyle and Companian were found less effective.