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Evaluation of microbial consortia of biocontrol agents and PGPRS for enhancing seedling quality of solanaceous vegetables

KrishiKosh

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Title Evaluation of microbial consortia of biocontrol agents and PGPRS for enhancing seedling quality of solanaceous vegetables
 
Creator C. C, Maina
 
Contributor M. K, Shivaprakash
 
Subject fungi, diseases, pathogens, planting, bacteria, biological control, biological development, vegetables, crops, biochemical compounds
 
Description Present investigation was undertaken to evaluate microbial consortia of biocontrol
agents and PGPRs for enhancing the seedling quality of solanaceous vegetables. The
most virulent pathogens isolated belonged to genera Pythium sp., Phytophthora sp.,
Fusarium sp. and Rhizoctonia sp. The biocontrol agents Pseudomonas fluorescens
(NBAII-Pf1), Bacillus subtilis (UASBR-Bs1) and Trichoderma harzianum (NBAII-TH1)
were found to be most effective against these virulent pathogens. Maximum inhibition of
pathogens was recorded by Trichoderma harzianum through production of volatile
metabolites. All the three biocontrol agents were found to be compatible with the PGPRs
Azotobacter chroococcum and Bacillus megaterium and were used to develop consortia.
The survival of the above mentioned organisms as consortia was best in the
combination of coirpith (65 %), soilrite (25 %) and pongamia cake (10 %) in which the
highest population was recorded in the second and third week of incubation and was
chosen for raising seedlings for greenhouse and field evaluation studies.
The studies under greenhouse conditions revealed that the substrate enriched with
consortia of selected biocontrol agents, PGPRs and Glomus intraradices were more
effective in disease suppression and growth promotion activities of tomato, chilli and
brinjal seedlings under nursery conditions thereby enhancing the biocontrol efficiency
and seedling vigour of the seedlings. Solanaceous seedlings raised with the substrate
enriched with consortia of Azotobacter chroococcum, Bacillus megaterium,
Pseudomonas fluorescens, Bacillus subtilis Trichoderma harzianum and Glomus
intraradices,established better under field conditions with less disease incidence, better
growth and yield in an ecofriendly manner.
 
Date 2016-05-18T11:35:36Z
2016-05-18T11:35:36Z
2012-09-18
 
Type Thesis
 
Identifier Th-10385
http://krishikosh.egranth.ac.in/handle/1/66064
 
Language en
 
Format application/pdf
 
Publisher University of Agricultural Sciences, Bengaluru