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Management of root diseases of fir (Abies pindrow Spach.) in forest nurseries of Kashmir valley

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Title Management of root diseases of fir (Abies pindrow Spach.) in forest nurseries of Kashmir valley
 
Creator Dar, Waseem Ali
 
Contributor Beig, M.A.
 
Subject Integrated disease management, Root rot, Fir, Fusarium oxysporum f.sp. Pini
 
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
 
Date 2016-08-20T11:00:37Z
2016-08-20T11:00:37Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/73128
 
Language en
 
Format application/pdf
 
Publisher SKUAST