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Articles by Gh. Hassan Dar
Total Records ( 2 ) for Gh. Hassan Dar
  Gh. Hassan Dar , M.A. Beig , F.A. Ahanger , Nadeem A. Ganai and M. Ashraf Ahangar
  The present study was aimed to identify root rot pathogens of blue pine (Pinus wallichiana) in Kashmir and develop appropriate eco-friendly disease management strategy. During nursery surveys, Fusarium oxysporum, Rhizoctonia solani and Macrophomina phaseolina were found root rot incitants with isolation frequency of 47.3, 29.7 and 13.0%, respectively. Locally isolated antagonists inflicted 33.0-73.3 and 29.5-70.8% mycelial growth inhibition in F. oxysporum and R. solani, respectively, with Trichoderma harzianum and T. viride proving most effective. The mycorrhizal fungi, Pisolithus tinctorius and Laccaria laccata, significantly inhibited the growth of R. solani and F. oxysporum by 46.2 and 45.4 and 44.7 and 43.7%, respectively. Bioagents significantly improved seedling biomass and root/shoot length. Mycorrhizal plants showed 5-13 fold higher rhizosphere phosphatase activity than non-mycorrhizal ones. Four effective fungal bioagents, inoculated individually and in combination with pathogen under nursery conditions, significantly improved seedling biomass and height with maximum gain by P. tinctorius and L. laccata. Rhizoctonia infection decreased biomass and seedling height by 32.6 and 35.4%, whereas bioagents mitigated the pathogenic effect. The bioagents in R. solani/F. oxysporum-infected soil significantly improved seedling biomass and height over pathogen treatments alone. P. tinctorius and L. laccata exhibited 44.2 and 39.1% root colonization in comparison to 19.5-24.2% in presence of pathogens. The study revealed that bioagents, especially mycorrhizae, effectively mitigate root rot in blue pine and can be efficiently exploited in integrated disease management module.
  Farooq A. Ahanger , Gh. Hassan Dar , Muzafar A. Beig and T.A. Sofi
  Blue pine (Pinus wallichiana), the dominant species of pine widely grown in the Himalayan region including Jammu and Kashmir State, has been found affected by needle cast disease. Recently during forest survey for needle blight diseases conducted in the year 2010 a new fungal pathogen, Lophodermium macci Sokolski and Berube, was identified for the first time from Asia with the help of morphological characterization and ITS-1 DNA sequencing technique. A free hand section in lactic acid fuchsin was used for morphological characterization. For molecular identification DNA was isolated from hysterothecia formed on the infected needles. The fungus, previously recorded on Pinus strobus, has been noticed for the first time on Blue pine (Pinus wallichiana) and Aleppo pine (P. halepensis). The pathogen L. macci is closely (98%) related to L. pini-excelsae and L. nitens. The conidiomata of L. macci which have not previously been documented were observed for the first time. The conidiomata were subepidermal dark brown to black in color. Black zone lines were only present when adjacent to other Lophodermium species. Since Lophodermium macci Sokolski and Berube has not so far been reported from any of the Asian countries so this forms the first report of this fungus from Asia. Further, the presence of L. macci on Pinus wallichiana and P. halepensis are new host records worldwide.
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