Management of root diseases of fir (Abies pindrow Spach.) in forest nurseries of Kashmir valley
KrishiKosh
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Title |
Management of root diseases of fir (Abies pindrow Spach.) in forest nurseries of Kashmir valley
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Creator |
Dar, Waseem Ali
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Contributor |
Beig, M.A.
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Subject |
Integrated disease management, Root rot, Fir, Fusarium oxysporum f.sp. Pini
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Description |
Root rot is one of the major diseases adversely influencing the growth of fir (Abies pindrow) seedlings in Kashmir valley. Studies on management of root rot of fir seedlings were undertaken during 2009 and 2010 at Shalimar campus, Srinagar, Kashmir. The disease was prevalent in all the three fir growing nurseries surveyed with disease incidence 32.2 and 29.3 per cent during 2009 and 2010, respectively. The diseased plants showed characteristic darkening of their peripheral and central root system, stunted growth, yellowing of shoots and decaying of roots. The pathogens associated with the disease were isolated, morphologically characterized and identified as Fusarium oxysporum f.sp. pini (Schlecht.) Synd. and Hans, Fusarium solani (Mart) Sacc and Rhizoctonia solani Kuhn. All the three proved pathogenic and developed characteristic root rot symptoms. Fusarium oxysporum f.sp. pini was most frequently occurring pathogen with isolation frequency of 58.0 per cent, whereas F. solani and R. solani showed frequency of 22.0 and 13.5 per cent, respectively. Among the various fungitoxicants evaluated against F. oxysporum f.sp. pini during in vitro studies carbendazim and mancozeb exhibited maximum mycelial growth inhibition of 80.5 and 73.2 per cent, respectively. The two fungitoxicants also resulted in maximum spore germination inhibition of 64.1 and 60.7 per cent, respectively. Various antagonists and ectomycorrhizal fungi evaluated through dual culture tests inhibited the growth of F. oxysporum f.sp. pini with varying degrees of inhibition. Among antagonists Trichoderma harzianum and Trichoderma viride and among the ectomycorrhizal fungi Laccaria laccata and Boletus edulis were most effective and showed mycoparasitic action and also developed zone of inhibition. pH levels ranging between 6.0-7.0 resulted in the optimum growth of bio-agents however, optimum growth F. oxysporum f.sp. pini was recorded at pH level of 5.5. During in vivo studies, fungitoxicants (carbendazim and mancozeb), antgonists (T. harzianum and T. viride) and ectomycorrhizal fungi (L. laccata and B. edulis) used individually or in combination resulted in significant reduction in root rot intensity of fir seedlings. In comparison to control treatments resulted in a significant increase in growth parameters viz., shoot and root length and in turn increased the plant biomass. Bio-agents were at par with each other in respect of plant growth when evaluated individually. Bio-agents in combination showed synergistic growth promoting action and were superior in increasing shoot and root length of inoculated fir seedlings. Fungitoxicants individually or as component of treatment combination were significantly superior to bio-agents used singly or in combination. Among the fungitoxicants, carbendazim individually or in combination was significantly superior to mancozeb in reducing the disease intensity. Among the treatments, combination of T. harzianum, + L. laccata + carbendazim proved significantly superior to all the treatments with respect to reduction in disease intensity and increase in growth parameters and sturdiness quotient |
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Date |
2016-08-20T11:00:37Z
2016-08-20T11:00:37Z 2013 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/73128
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Language |
en
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Format |
application/pdf
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Publisher |
SKUAST
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