EVALUATION AND CHARACTERIZATION OF BIO FERTILIZER AND BIOLOGICAL CONTROL ACTIVITIES OF AERATED AND NON- AERATED COMPOST TEA AGAINST LATE BLIGHT IN POTATO AND BLAST DISEASE IN RICE CROPS
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Date
2017-08-16
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Devastating crop diseases such as Late Blight of Potato and Blast of Rice cause
extensive loss of yield globally. The environmental pollution caused by excessive use of
agrochemicals, has led to use of biological alternatives such as ‘Compost tea’, an
enriched microbial liquid suspension. Earlier work by Anil and Coworkers showed that,
aerated Compost Tea (ACT) in an integrated formulation with reduced fungicide (RF)
increased plant biomass, chlorophyll, yield and managed Late Blight in Potato field
experiments, (Anil et al., 2017). The objective of the present study was to comparatively
evaluate the effects of aerated and non-aerated compost tea (ACT & NCT), along with
the reduced number of sprays (ACT5, and NCT5) on Potato and Rice crop. All aerated
and non aerated compost tea treatments with ten and five sprays resulted in higher
biomass, increased chlorophyll, yield. ACT10 sprays among all treatments managed Late
Blight of Potato and Blast of Rice to the best extent. However, lower number of sprays
and nonaerated formulations also managed the disease. Biochemical analysis indicates
induced systemic resistance by induction of defense as evaluated by increased SOD,
POX, Phenolic and flavonoid levels. An evaluation of microbial composition showed
compost teas have a rich microbiota. The fungal and bacterial isolates from compost tea
showed significant inhibition of P. infestans and M. grisae on dual plate inhibition
assays. The results of this study indicate that Compost tea based strategy is an eco
friendly, effective biocontrol and biofertilizer in managing Late Blight of Potato and
Blast of Rice.
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