Abstract:
Phytopathogenic fungi, Phytophthora palmivora and Phytophthora megakarya continue to be a major
threat to cocoa production worldwide. To counter these drawbacks, producers rely heavily on
agrochemicals leading to pathogen resistance and environmental hazards. There is also increasing
demand by cocoa consumers for pesticide-free seeds. Therefore, biological control through the use of
natural microbial antagonists is more rational and safer crop management option. The plant-associated
Bacillus amyloliquefaciens, ESI was selected in vitro, among seven other Bacillus species as the most
promising, using the zone of inhibition techniques. The B. amyloliquefaciens together with two other
laboratory contaminants, Aspergillus and Penicillium spp. were used to control black pod disease of
cocoa caused by P. palmivora and P. megakarya on detached cocoa pods and under field conditions.
Even though all the eight bacterial isolates inhibited the black pod fungi in vitro, B. amyloliquefaciens,
ESI inhibited P. palmivora with the highest inhibition zone of 21.21 mm and P. megakarya with 16.00
mm. The Aspergillus and Penicillium spp. also inhibited P. palmivora with an inhibition zone of 22.41
and 16.81 mm, respectively. Detached cocoa pod areas protected with broth suspensions of the three
microbial antagonists and challenged with a zoospore suspension of P. palmivora, completely
prevented black pod lesion development. Field pods sprayed with individual microbial broth
suspensions and their mixtures and also challenged with a zoospore suspension inoculum, controlled
black pod disease with percentage disease control ranging from 53.33-66.67% in the minor season and
40.00-66.67% in the major season. Results clearly show that these antagonists have the potential to be
developed as biocontrol agents for the management of black pod disease of cocoa.
Key words: Biocontrol agents, pathogenic fungi, microbial antagonists, inoculum, Bacillus amyloliquefaciens,
Aspergillus sp. and Penicillium sp.
