Fungicide compatible potential biocontrol agents against Colletotrichum gloeosporioides Penz. causing mango anthracnose.
Devamma M. N., Rajkumari J. P., Devi P. S.
Author Affiliation: Department of Botany, Sri Venkateswara University, Tirupati - 517 502, India.
Current Biotica 5 : 454-464
Abstract : Pathogenic studies were conducted under greenhouse conditions to test the virulence of Colletotrichum gloeosporioides Penz. isolates collected from different regions of Chittoor district, Andhra Pradesh. The results indicated that the isolate PTR6 was highly virulent (76.30%) and the isolate VDM2 (12.55%) was found to be least virulent. Of all the six fungicides evaluated, the systemic fungicide thiophanate-methyl (100%) and the non-systemic fungicide mancozeb (100%) proved to be effective in inhibiting the mycelial growth of the highly virulent pathogen at 50 ppm and 500 ppm concentrations, respectively. Among the 21 bacterial biocontrol agents screened in dual culture, the potential biocontrol agents viz., BP5 (100%), BL5 (100%), BL4 (97.11%) and BL6 (90.44%) were superior in arresting the growth of the pathogen. Compatibility studies revealed that the potential bacteria BL5 from leaf endophyte habitat was highly compatible with thiophanate-methyl (100%) followed by mancozeb (98.33%) which can be exploited for field evaluation.