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Dr. Y. S. Parmar University of Horticulture & Forestry, Solan

Dr. Yashwant Singh Parmar University of Horticulture and Forestry, Solan, was established on 1st December, 1985 with the objective to promote education, research and extension education in the fields of Horticulture, Forestry and allied disciplines. Late Dr. Yashwant Singh Parmar, the first Chief Minister and the architect of Himachal Pradesh perceived the importance of Horticulture and Forestry to develop and improve the State economy which led to the establishment of this University. Its history lies in erstwhile Himachal Agricultural College, Solan, established in 1962 and affiliated to the Panjab University. It became one of the campuses of Agriculture Complex of Himachal Pradesh University on its formation in 1970. Consequent upon the establishment of Himachal Pradesh Krishi Vishvavidyalaya in 1978, this campus became its Horticulture Complex and finally in 1985, assumed the status of a State University, being the only University in the country engaged exclusively in teaching, research and extension in Horticulture and Forestry. The University is located at Nauni in Solan District of Himachal Pradesh, 13 km from Solan on Solan-Rajgarh Road, at an elevation of 1300 metres above mean sea level. Solan town is situated on national highway (NH-22) and is well connected by train and bus services. The University has four constituent colleges, out of which, two are located at the main campus Nauni, one for horticulture and the other for forestry, having 9 and 7 departments, respectively. The third College i.e., College of Horticulture & Forestry is located at Neri in Hamirpur District on Nadaun-Hamirpur state highway, about 6 Km from Hamirpur town and is well connected with bus service. The college offers three Undergraduate Degree Programmes i.e. BSc (Hons.) Horticulture, BSc (Hons.) Forestry and B. Tech. Biotechnology and MSc degree programme in a few subjects. The fourth college i.e. College of Horticulture and Forestry, Thunag (Mandi) is located at Thunag District Mandi. This college offer BSc (Hons.) Horticulture and BSc (Hons.) Forestry degree programme. In addition, there are five Regional Research Stations, 12 Satellite Stations and five Krishi Vigyan Kendras (KVKs) situated in different zones of the State.

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Subject: Plant Pathology × Author: GUPTA, SHIVANI × End date: 2019 × Start date: 2019 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    ETIOLOGY AND MANAGEMENT OF CERCOSPORA LEAF SPOT OF MARIGOLD
    (UHF,NAUNI, 2019-08) GUPTA, SHIVANI; CHANDEL, SUNITA
    ABSTRACT The present investigation onABSTRACT The present investigation on Cercospora leaf spot of marigold (Cercospora tageticola Ellis & Everhart) were undertaken in relation to prevalence during 2017 and 2018 crop seasons. Highest disease incidence and severity (62.4% and 70.4%) was recorded in Nauni while, least incidence was observed in Chhogtali (8.9% and 8.6%) of Sirmaur district. Characteristic symptoms of the disease first appeared as circular to angular, dark reddish brown to purplish and later almost to brown black, the centre of which is often greyish in colour. On advancement, symptoms slowly develop from lower to upper leaves giving blighted appearance. The lesions on the flowers were small but conspicuous light to dark brown as they grow, circular initially becoming unequal to irregular blotches. Morphological studies of the test pathogen revealed that the mycelia (8.54-11.34m) were hyaline, septate and branched in old cultures whereas pathogen produced geniculate, conidiophores of 3.5-6 x 50-300m on which hyaline conidia were formed which ranged from 2.7-5 × 70-200 m in size. On the basis of morphological characters, the associated pathogen was identified as Cercospora tageticola Ellis & Everhart. Pathogenicity of test pathogen was proved following Koch’s postulates on cv. “Pusa Narangi Gainda”. The symptoms of the disease appeared on leaves after 8 days of inoculation of the pathogen, suggesting incubation period of 192 hours best for occurrence. Cultural and physiological factors viz., solid cultural media, temperature and pH were found to have a significant impact on the pathogen growth in in vitro conditions. Best solid cultural media (Carrot decoction agar) was found to have maximum radial mycelial growth (50.67mm) of Cercospora tageticola whereas in case of temperature and pH, maximum radial growth was found at 25°C (50.67 mm) and dry mycelial weight at pH5.5 (765.15 mg) with good sporulation possessing black to greyish mycelial growth. For disease management, different four non-systemic and six systemic fungicides and nine botanicals and bioresources were evaluated against test pathogen both under in vitro and in vivo conditions. Among fungicides, Folicure 25% EC (tebuconazole) (83.70 per cent) recorded maximum mycelial inhibition with minimum radial growth (14.67mm) of test pathogen while in case of botanicals/bioresources, darak leaves extract (Melia Azedarach Makino) and beejamrit was most effective and significantly superior to all other treatments with 79.79 and 63.38 per cent inhibition in mycelial growth, respectively. Out of best fungicides, botanicals/bioresources and well known biocontrol agents tested as seed treatment to know their impact on seed health parameters and seed infection, three treatments, Folicure 25% EC (tebuconazole), Score 25% EC (difenoconazole) and Trichoderma harzianum were found superior in improving high germination percentage from 63.33 to 76.00, other seed growth parameters and reduction in seed infection. Four available varieties of marigold were screened against Cercospora tageticola under natural epiphytotic conditions out of which UHF 786 was found to be moderately resistant. of marigold (Cercospora tageticola Ellis & Everhart) were undertaken in relation to prevalence during 2017 and 2018 crop seasons. Highest disease incidence and severity (62.4% and 70.4%) was recorded in Nauni while, least incidence was observed in Chhogtali (8.9% and 8.6%) of Sirmaur district. Characteristic symptoms of the disease first appeared as circular to angular, dark reddish brown to purplish and later almost to brown black, the centre of which is often greyish in colour. On advancement, symptoms slowly develop from lower to upper leaves giving blighted appearance. The lesions on the flowers were small but conspicuous light to dark brown as they grow, circular initially becoming unequal to irregular blotches. Morphological studies of the test pathogen revealed that the mycelia (8.54-11.34m) were hyaline, septate and branched in old cultures whereas pathogen produced geniculate, conidiophores of 3.5-6 x 50-300m on which hyaline conidia were formed which ranged from 2.7-5 × 70-200 m in size. On the basis of morphological characters, the associated pathogen was identified as Cercospora tageticola Ellis & Everhart. Pathogenicity of test pathogen was proved following Koch’s postulates on cv. “Pusa Narangi Gainda”. The symptoms of the disease appeared on leaves after 8 days of inoculation of the pathogen, suggesting incubation period of 192 hours best for occurrence. Cultural and physiological factors viz., solid cultural media, temperature and pH were found to have a significant impact on the pathogen growth in in vitro conditions. Best solid cultural media (Carrot decoction agar) was found to have maximum radial mycelial growth (50.67mm) of Cercospora tageticola whereas in case of temperature and pH, maximum radial growth was found at 25°C (50.67 mm) and dry mycelial weight at pH5.5 (765.15 mg) with good sporulation possessing black to greyish mycelial growth. For disease management, different four non-systemic and six systemic fungicides and nine botanicals and bioresources were evaluated against test pathogen both under in vitro and in vivo conditions. Among fungicides, Folicure 25% EC (tebuconazole) (83.70 per cent) recorded maximum mycelial inhibition with minimum radial growth (14.67mm) of test pathogen while in case of botanicals/bioresources, darak leaves extract (Melia Azedarach Makino) and beejamrit was most effective and significantly superior to all other treatments with 79.79 and 63.38 per cent inhibition in mycelial growth, respectively. Out of best fungicides, botanicals/bioresources and well known biocontrol agents tested as seed treatment to know their impact on seed health parameters and seed infection, three treatments, Folicure 25% EC (tebuconazole), Score 25% EC (difenoconazole) and Trichoderma harzianum were found superior in improving high germination percentage from 63.33 to 76.00, other seed growth parameters and reduction in seed infection. Four available varieties of marigold were screened against Cercospora tageticola under natural epiphytotic conditions out of which UHF 786 was found to be moderately resistant.