Inhibition Effects of Culture Filtrates and Volatile Compounds of Antagonistic Microbes Isolated from Vermicompos and Compost Teas on the Growth of Alternaria solani Sor. in Vitro

Alternaria solani Sor. is one of destructive pathogens in solanaceous plants including tomato. Bacteria and yeast isolated from water extract organic matters are potential as biological control agents plant pathogenic fungi. Mechanisms antagonism bacteria can be through antibiosis. This study was conducted to examine the abilities culture filtrate volatile compounds produced by antagonistic compost vermicompost teas inhibit growth A. vitro. The experiments were arranged randomized complete design with four replications. experiment applied well diffusion method, while compound effect used petri dish sandwich method. results showed that filtrates three isolates inhibited vitro 16.6-87.5%. highest inhibition level KSB4 isolate (Bacillus subtilis), a bacterial cow manure tea. In experiment, tested pathogen 31.3-75.2%, KcB3, its both high (62.7% 87.5%) on (B. subtilis).