Bioefficacy of botanicals against Colletotrichum gloeosporioides of onion

Abstract

Onion (Allium cepa) (Latin 'cepa' = onion), also known as the bulb onion or common onion, is used as a vegetable and is the most widely cultivated species of the genus Allium.) crop is affected by number of pathogenic fungi, causing significant qualitative and quantitative losses. Therefore, present in vitro study was conducted to asses bioefficacy of eight bioagents against pathogen Colletotrichum gloeosporioides, by applying Dual Culture Technique. Experiments were planned and conducted with Completely Randomized Design (CRD) and all the treatments replicated thrice. The results revealed that all of the eight test bioagents significantly inhibited mycelial growth of Colletotrichum gloeosporioides, over untreated control. However, T. hamatum was found most effective with least mycelial growth (16.33 mm) and highest mycelial inhibition (81.11%), followed by T. virens (20.00 mm and 77.77%), T. koningii (22.33 mm and 75.55%), T. harzianum (26.00 mm and 71.11%), T viride, (26.50 mm and 70.00%), A. niger (27.33 mm and 69.63%), P. fluorescens (55.66 mm and 38.15%) and B. subtilis (60.00 mm and 33.33%).