Browsing by Author "SOOD, DEEPIKA"
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ThesisItem Open Access STUDIES ON BACTERIAL WILT OF TOMATO AND ITS ECO-FRIENDLY MANAGEMENT(UHF, NAUNI, 2018-09) SOOD, DEEPIKA; SHARMA, MONICAABSTRACT bac The present investigation entitled “Studies onterial wilt of tomato and its eco-friendly management” was conducted in the laboratories and polyhouse of the Department of Plant Pathology. In the present research work, survey was done in district Solan and Sirmaur of Himachal Pradesh and highest disease incidence (70.45%) was observed in Nandal while, least incidence was observed in Deothi (10.00%). Characteristic symptoms of the disease appeared as initial loss of turgidityof young leaves as a result of disfunctioning of vascular bundles, flabby appearance usually at the warmest time of the day and later on, rapid wilting and collapse of entire plant. Morphological, cultural and biochemical tests of theolated p isathogen revealed that it was Ralstonia solanacearum. , tests of the isolated bacterium were performed by two methods out of which shorter incubation period (11 days) was observed in bacterial suspension drenching method than seedling root dip method (13 days).,of R.solanacearumrevealed that with the increase in soil moisture and soil temperature from 40 to 90 per cent and 25 to 35°C, respectively, there was a progressive increase in disease incidence, being maximum at 90 per cent soil moisture and 30 and 35°C temperature. Among different abiotic resistance-inducers evaluated under pot culture conditions, seedling dip treatment and drenching one week after transplanting with potassium chloride at 300 mM was found most effective in managing the disease and increasing plant weight and plant height. The activity level of key enzymes of plant defence namely polyphenol oxidase, peroxidase and phenyl alanine lyase was maximum at 24 h after elicitation and thereafter declined. Among three biocontrol agents used, Bacillus subtilis (seedling dip + foliar spray after 7 days of transplanting) treatment was most effective as it was able to reduce the disease by 56.76 per cent. A consortium of Bacillus subtilis and Trichoderma viride in neem cake and molasses was made which gave best result as it was able to completely hold off the disease as well as increased plant weight and plant height and resultedin 0 per cent disease incidence.ThesisItem Open Access TOXIMETRIC STUDIES OF BOTRAN AGAINST Rhizopus stolonifer CAUSING WHISKER'S ROT OF PEACHES(UHF,NAUNI, 1997) SOOD, DEEPIKA; KAUL, J.L.