Studies on blue mould rot of aonla (Emblica officinalis Goerth.) caused by Penicillium islandicum (Sopp.)
| dc.contributor.advisor | Sharma, Sushil Kumar | |
| dc.contributor.author | Saini, Anil Kumar | |
| dc.date.accessioned | 2017-09-29T07:13:52Z | |
| dc.date.available | 2017-09-29T07:13:52Z | |
| dc.date.issued | 2017 | |
| dc.description.abstract | Aonla or Indian gooseberry (Emblica officinalis Goerth. Syn. Phyllanthus emblica L.) is one of the most important indigenous fruit of Indian sub continent. The blue mould rot caused by Penicillium islandicum adversly affects the fruit quality, quantity and ultimately reduces the marketable value. In India, nearly 20 – 35 per cent of perishables are lost due to post harvest diseases. Keeping the above facts in view, the present study was undertaken to survey orchards and terminal markets of Hisar and Rewari districts of Haryana, screen different varieties, study the various biochemical and epidemiological factors, and to develop suitable strategies through use of fungicides, chemicals, bioagents and botanicals for management of blue mould rot of aonla. Fortnightly survey carried out from November to January, 2015-16 revealed that blue mould rot incidence was higher in terminal markets of Hisar and Rewari Distt as compared to orchards in the respective locations. Varietal screening revealed that least blue mould rot intensity was found in Desi (2.67%) and Kanchan (3.33%) while maximum rot was observed in Chakaiya (50.00%) and Banarsi (49.33%) aonla varieties. In biochemical studies, it was observed that total soluble solids, total phenol, peroxidase and polyphenol oxidase activity increased in diseased fruits in comparison to healthy fruits, while ascorbic acid and acidity decreased over time in both healthy and diseased fruits. The epidemiological studies revealed that the injury of the aonla fruits was found to be a pre-requisite for infection. A minimum number of 50 spores/ml was necessary for disease initiation whereas maximum blue mould rot incidence was noted at 30ºC and 100 per cent relative humidity. Relative efficacy of five chemicals against blue mould rot tested in vitro and in vivo at 0.2, 0.5 and 1.0 M concentrations revealed that boric acid at 1.0 M concentration was the best to inhibit growth in pre- and post-inoculation after five and ten days of inoculation in both test conditions. In vitro and in vivo bio-efficacy studies involving ten plant extracts at 5, 10 and 20 per cent concentration for the management of blue mould rot indicated that treatment with neem leaf extract exhibited maximum mycelial growth inhibition (91.88%) at concentration of 20 per cent resulting in minimum pre- and post-treatment disease intensity of 7.31 and 8.13%, respectively, after five days of inoculation. Similar trend was also recorded in pre and post treatment after ten days of inoculation. Five bioagents were also studied for control of Penicillium islandicum by dual culture technique. Significantly highest per cent growth inhibition of P. islandicum was noted in Trichoderma harzianum (83.06%). T. harzianum with disease intensity 6.0 and 6.31 per cent was found most efficient antagonist in reducing the blue mould rot with disease intensity of 34.48 and 39.75% in pre- and post- inoculation, respectively, after five days of inoculation. Similar results were also obtained in pre- and post-treatment after ten days of inoculation. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810031950 | |
| dc.keywords | Aonla, Penicillium islandicum, Blue mould rot, Biochemical, Plant extracts | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | CCSHAU | en_US |
| dc.sub | Plant Pathology | en_US |
| dc.subject | null | en_US |
| dc.theme | Studies on blue mould rot of aonla (Emblica officinalis Goerth.) caused by Penicillium islandicum (Sopp.) | en_US |
| dc.these.type | Ph.D | en_US |
| dc.title | Studies on blue mould rot of aonla (Emblica officinalis Goerth.) caused by Penicillium islandicum (Sopp.) | en_US |
| dc.type | Thesis | en_US |