Biological Control of Groundnut Stem Rot and Collar Rot Pathogens under  in vitro Conditions

V. Divya Rani; Hari Sudini; P. Narayan Reddy; G. Uma Devi; K. Sadaiah; K. Vijay Krishna Kumar

doi:10.9734/ijecc/2023/v13i51767

Research Article Open access CC BY 4.0

Biological Control of Groundnut Stem Rot and Collar Rot Pathogens under in vitro Conditions

V. Divya Rani, Hari Sudini, P. Narayan Reddy, G. Uma Devi, K. Sadaiah, K. Vijay Krishna Kumar

International Journal of Environment and Climate Change · pp. 254–268 · Published 31 Mar 2023

10.9734/ijecc/2023/v13i51767

Abstract

The experiment was conducted under laboratory conditions by using native isolates. These were tested against stem rot (S. rolfsii) and collar rot (A. niger) pathogens of groundnut under in vitro conditions by using dual culture technique. The fungal and bacterial bioagents which are inhibitory against these pathogens were identified by 18S rRNA (fungi) and 16S rRNA (bacteria) techniques and were compared with those from the GenBank using the BLAST program. Among fungal isolates T. harzianum (MBNRT-1) was superior in inhibition of S. rolfsii and A. niger and the per cent inhibitions were 70.5% in case S. rolfsii whereas; in A. niger the inhibition was 72.9 per cent. Among native bacterial isolates the isolate B. amyloliquifaciens (MBNRB-3) and is significantly superior over the other isolates in inhibiting the pathogens S. rolfsii and A. niger under in vitro conditions and the inhibitions were 66.6 per cent and 63.0 per cent respectively. Further, compatibility of effective fungal and bacterial bioagents T. harzianum (MBNRT-1) and B. amyloliquifaciens (MBNRB-3) with six fungicides and eight herbicides indicated that among the fungicides the azoxystrobin was highly compatible with both the bioagents T. harzianum (MBNRT-1) and B. amyloliquifaciens (MBNRB-3) whereas, among the herbicides imazethapyr + imazamox was found to be compatible with both the bioagents with all the concentrations. While, tebuconazole, thiram, mancozeb+carbendazim (fungicides) and quizolofop-p-ethyl and pendimethalin (herbicides) were highly inhibitory to the T. harzianum (MBNRT-1) and B. amyloliquifaciens (MBNRB-3) under in vitro conditions.

Biological control groundnut stem rot collar rot compatibility fungicides herbicides

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V. Divya Rani, Hari Sudini, P. Narayan Reddy, G. Uma Devi, K. Sadaiah, K. Vijay Krishna Kumar (2023). Biological Control of Groundnut Stem Rot and Collar Rot Pathogens under in vitro Conditions. International Journal of Environment and Climate Change , 254–268. https://doi.org/10.9734/ijecc/2023/v13i51767

Affiliations

V. Divya Rani — Department of Plant Pathology, Professor Jayashankar Telangana State Agricultural University, Hyderabad, Telangana (500030), India.
Hari Sudini — International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Telengana (502324), India.
P. Narayan Reddy — Anurag Agricultural University, Venkatapur, Ghatkesar Rd, Hyderabad, Telangana (500088), India.
G. Uma Devi — Department of Plant Pathology, Professor Jayashankar Telangana State Agricultural University, Hyderabad, Telangana (500030), India.
K. Sadaiah — Department of Genetics and Plant Breeding, Professor Jayashankar Telangana State Agricultural University, Hyderabad, Telangana (500030), India.
K. Vijay Krishna Kumar — Department of Plant Pathology, Professor Jayashankar Telangana State Agricultural University, Hyderabad, Telangana (500030), India and Department of Plant Pathology, Acharya N G Ranga Agricultural University, Guntur, Andhra Pradesh (522034), India.

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