EVALUATION OF MICROBIAL AND ORGANIC FORMULATIONS FOR GROWTH PROMOTION AND BIOCONTROL ACTIVITIES IN BABY CORN (Zea mays L.)
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Date
2018-10-29
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
The present investigation was undertaken to evaluate the microbial and organic
formulations for growth promotion and biocontrol activities in baby corn (Zea mays L.)
under greenhouse and field condition in Department of Agricultural Microbiology, UAS,
GKVK, Bengaluru. To identify the best combinations of microbial and organic
formulations to enhance plant growth, nutrient supply and biocontrol activities. Among
the biocontrol agents tested Trichoderma harzianum showed maximum per cent
inhibition against selected pathogens and jeevamrutha organic liquid showed maximum
per cent inhibition against respective pathogens. Among all entomopathogens Beauveria
bassiana and panchagavya organic liquid showed highest pathogenic effect on
Helicoverpa armigera and Chilo partellus. Biocontrol efficiency, seedling vigour index
and mortality per cent were tested in seedling tray experiment using selected
microorganisms under green house condition. Higher biocontrol efficiency and seedling
vigour index was observed in plants treated with Pathogen + Gluconacetobacter
diazotrophicus + Bacillus megaterium + Piriformospora indica + Pseudomonas
fluorescens + Bacillus subtilis +Trichoderma harzianum on six pathogens of baby corn
and higher mortality per cent was found in larvae infested plants sprayed with Beauveria
bassiana + Photorhabdus luminescence + Bacillus thuringiensis on two pests of baby
corn. Multiple combination of Gluconacetobacter diazotrophicus + Bacillus megaterium
+ Piriformospora indica + Pseudomonas fluorescens + Bacillus subtilis +Trichoderma
harzianum showed positive influence on growth of baby corn in pot culture experiment
under green house condition and significantly increased plant growth, chlorophyll and
nutrient content, plant biomass, yield and quality parameters and established better under
field condition with less pest and disease incidence