Enhanced activity of introduced biocontrol agents in solarized soils and its implications on the integrated control of tomato damping-off caused by Pythium spp |
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Authors: | J Jayaraj N V Radhakrishnan |
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Institution: | (1) Department Plant Pathology, Faculty of Agriculture, Annamalai University, Annamalai Nagar 608 002, Tamil Nadu, India;(2) Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada;(3) Coconut Research Station, Kerala Agricultural University, Balaramapuram, Thiruvananthapuram, 695 509, Kerala, India |
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Abstract: | Soil solarization in combination with introduction of biocontrol agents (BCA) was evaluated as a potential disease management
strategy for tomato damping-off caused by Pythium spp. A rifampicin resistant Pseudomonas fluorescens strain (PfT-8) and a carbendazim resistant Trichoderma harzianum strain (ThM-1) were introduced into soil following solarization. Tomato seeds were planted into treated field plots. The
influence of soil solarization and application of biocontrol agents on damping-off incidence, plant biomass, rhizosphere population
of introduced antagonists, and native Pythium spp. was assessed by two consecutive field trials. Damping-off incidence was significantly reduced in solarized plots compared
to control. Soil inoculation of biocontrol agents into solarized plots resulted in the highest suppression of damping-off
incidence (PfT-8 up to 92%; ThM-1 up to 83%), and increase in plant biomass (PfT-8 up to 66%; ThM-1 up to 48%) when compared
to un-solarized control plots. Rhizosphere population of introduced biocontrol agents gradually increased (PfT-8 up to 102%
and ThM-1 up to 84%) in solarized soils when compared to unsolarized control. The population of Pythium spp in rhizosphere soil was reduced up to 55% in solarized plots; whereas, application of BCA to solarized soils reduced
the rhizosphere population of Pythium spp. by 86 and 82% in P. fluorescens and T. harzianum applied plots respectively. |
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Keywords: | Pseudomonas fluorescens Trichoderma harzianum Soil solarization Damping-off disease control Rhizosphere population |
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