Potentiality of bioagents and botanicals against papaya black spot fungus: Asperisporium caricae

Abstract

Among the seven bio agents evaluated in the experiment by following dual culture technique T. viride (72.59%) exhibited highest mycelial inhibition, followed by T. asperellum (70.37%), T. harzianum (64.81%), Ampelomyces quisqualis (63.33%), antagonistic bacteria Bacillus subtilis (9.63%), P. fluorescens (6.67%) whereas, least inhibition was observed by Bacillus pumilis (4.44%). Poison food technique was followed with seven plant extracts to test their efficacy against papaya black spot (A. caricae). Excellent mycelial growth inhibition was observed by Allium sativum (27.93%) which was significantly higher than all other treatments, which was followed by Zingiber officinale (24.15%). Next best inhibition was imparted by Vinca rosea (1.77%) but which was much less effective as compared to Allium sativum and Zingiber officinalis. Little inhibition was imposed by Tinospora cordifolia (1.47%), Azardiracta indica (1.12%), Tagetes erecta (1.07%) and Seaweed extract (0.67%) which were on par with each other.