Vol. 10, Issue 10 (2021)

Author(s):
Mina Kumari and PK Jha

Abstract:
Aloe vera is an important medicinal plant. Black spot in Aloe vera is most serious fungal disease caused by Colletotrichum gloeosporioides (Penz.) Penz. & Sacc. In the present investigation culture filtrate of four native biocontrol agents, (Trichoderma viride, T. harzianum, T. asperellum and Aspergillus niger) isolated from phylloplane and rhizosphere of Aloe vera were tested in-vitro for its efficacy against spore germination and growth of pathogen. All the treatments were found effective and recorded significant reduction in spore germination and growth of the test pathogen over untreated control. Out of four biocontrol agents, Aspergillus niger was the most effective and exhibited a spore germination inhibition of 80.66% followed by T. harzianum (76.48%), T. viride (75.10 %) and T. asperellum (73.93 %) at 15% concentration. The highest growth suppression was recorded in Trichoderma harzianum (86.61%) followed by T. viride (85.18%), A. niger (84.78%) and T. asperellum (82.91%) at 15 % concentration. The results of this study revealed that all the culture filtrate of all biocontrol agents have the potential to inhibit the spore germination and growth of C. gloeosporioides.