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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: ANKITA × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    STUDIES ON DOWNY MILDEW OF ONION (Allium cepa L.)
    (UHF,NAUNI, 2018-07-05) ANKITA; CHANDEL, SUNITA
    ABSTRACT Onion downy mildew disease is a serious threat to Onion production in India. Onion downy mildew is caused by Peronospora destructor (Berk.) Casp. ex Berk. which causes heavy losses to onion worldwide as well as in Himachal Pradesh. Therefore detailed investigations were undertaken with the objectives to record the disease severity of downy mildew of onion in Solan district of Himachal Pradesh, and to study the morphological, epidemiological parameters of the pathogen and device suitable management strategies with SAR inducers and other chemicals. Survey revealed that disease was moderately prevalent in Solan district with severity range varying between 4.78 to 58.65 per cent, maximum at Pandah (58.65 %) and minimum at Dharampur (4.78 %). The pathogen was identified based on the morphological features as Peronospora detructor (Berk.) Casp. ex Berk. Most distinguishing morphological features of pathogen were production of hyaline, coenocytic mycelia having width of 3.7-6.8 μm, dichotomously branched sporangiophores and hyaline pyriform/fusiform sporangia measuring in length (50.4-65.8 μm ) and width (24.6-25.2 μm). The pathogenicity results were obtained within 8-12 days of inoculation. Among various temperature regimes, the maximum germination (73.96 %) and germ tube length growth (202.98 μm) was observed at temperature 15º C whereas RH levels of more than 95 per cent were suitable for germination as maximum germination (71.4 %) was seen at 100 per cent RH with maximum germ tube length (142.63 μm). Effect of different meteorological parameters on progress of downy mildew of onion (cv. ‘Palam Lohit’) was studied under field conditions and it was observed that the disease severity become apparent in last week of February with minimum disease severity of 3.55% which gradually increase in respective months and assumed highest proportion (72.76%) in the second week of April, 2018. The mean maximum temperature ranging from 21.5-26.6 oC, mean minimum temperature of the range 6.7-17.23 oC, average relative humidity of 52-68%, cumulative rainfall of 1-4.5 mm favoured the disease spread. In vitro evaluation of 4 non-systemic and 3 combi-products fungicides revealed that one systemic fungicide Dithane M-45 and two combi-products Ridomil Gold and Cabrio Top were most efficacious. Highest inhibition of sporangial germination (100%) was recorded in Ridomil Gold followed by Dithane M-45 and Cabrio Top while Blitox 50 gave minimum inhibition even at higher concentrations. Best performing fungicides under in vitro were tested under in vivo conditions along with other three SAR chemicals (Chitosan, Potassium orthophosphate and BABA) and reported their effectiveness by reducing the disease severity to 12.5 per cent in comparison of the control (69.5%) of onion downy mildew and increasing the average plant height, bulb yield to 43.9 cm, 26.7 t/ha, respectively.