Vol. 12, Issue 12 (2023)

Author(s):
Mayekar AN, Bhagwat RG, Kadam JJ, Arai MFN, Arote RR, Dhole GS, Divkar PM and Phondekar UR

Abstract:
Collar rot of groundnut caused by Aspergillus niger is an important seed and soil borne disease. Collar rot is reported to cause losses in yield up to 40% in India. Utilization of biocontrol agents along with fungicides is best suited for integrated disease management. In this study, total six bioagents were evaluated in vitro against A. niger, out of which Pseudomonas fluorescensrecorded significantly highest mycelial growth inhibition (61.66%) of the test pathogen, followed by T. longibrachiatum (58.33%), T. harzianum (57.41%), T. koningii (53.52%), Bacillus subtilis (53.15%) and Penicillium funiculosum (50.00%). Among eight fungicides evaluated in vitro were found effective against A. niger. However, Copper oxychloride 50% WP @ 0.25%, Carbendazim 12% + Mancozeb 63% WP @ 0.2%, Tebuconazole 25.9% EC, Carbendazim 50% WP and Carboxin 37.5% + Thiram 37.5% WP each @ 0.1% resulted with cent per cent (100%) mycelial growth inhibition. These were followed by Azoxystrobin 23% SC @ 0.1% (57.51%), Mancozeb 75% WP @ 0.2% (52.04%) and Thiram 75% WP @ 0.2% (50.74%).