Factors influencing the incidence of basal stem rot and blight disease caused by Sclerotium rolfsii in vegetable cowpea and its management using botanicals

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Authors

  • Sri P. T.
     Department of Plant Pathology, College of Agriculture, Kerala Agricultural University, Vellayani, Thiruvananthapuram – 695522, Kerala ,IN
  • Sajeena A.
     Integrated Farming System Research Station, Kerala Agricultural University, Karamana, Thiruvananthapuram – 695002, Kerala ,IN ORCID logo http://orcid.org/0000-0002-3381-5973
  • Johnson J. M.
     Department of Plant Pathology, College of Agriculture, Kerala Agricultural University, Vellayani, Thiruvananthapuram – 695522, Kerala ,IN
  • John J.
     Integrated Farming System Research Station, Kerala Agricultural University, Karamana, Thiruvananthapuram – 695002, Kerala ,IN
  • Radhika N. S.
     Department of Plant Pathology, College of Agriculture, Kerala Agricultural University, Vellayani, Thiruvananthapuram – 695522, Kerala ,IN

DOI:

https://doi.org/10.18311/jbc/2020/25599

Keywords:

Basal stem rot and blight, garlic bulb, garlic creeper, Sclerotium rolfsii
Biological control using botanicals

Abstract

Basal stem rot and blight disease incited by Sclerotium rolfsii resulted in significant crop loss in vegetable cowpea. Among the different levels of pH tested under in vitro conditions, pH 6.0 was revealed to be optimum for the mycelial growth, whereas pH 7.0 supported maximum sclerotia formation. Soil moisture of 35 to 50 per cent was ideal for early disease expression and establishment. A minimum level of two per cent fungal inoculum multiplied in sand oats medium resulted in complete disease incidence. Among the botanicals tested in vitro, garlic bulb extract (1%) and garlic creeper leaf extract (5%) revealed cent per cent inhibition of mycelial growth and sclerotia formation of the fungus. Both the extracts also inhibited the mycelial regeneration from sclerotia. Thus, garlic bulb and garlic creeper were revealed to be potent botanicals which can be used as effective alternatives to soil fumigants for the management of S. rolfsii.

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Published

2021-02-11

How to Cite

P. T., S., A., S., J. M., J., J., J., & N. S., R. (2021). Factors influencing the incidence of basal stem rot and blight disease caused by <i>Sclerotium rolfsii</i> in vegetable cowpea and its management using botanicals. Journal of Biological Control, 34(3), 215–222. https://doi.org/10.18311/jbc/2020/25599

Issue

Volume 34, Issue 3, September 2020

Section

Research Articles
Crossref
Scopus
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Europe PMC
Received 2020-07-04
Accepted 2020-12-22
Published 2021-02-11

 

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