Evaluation of a microbial consortium for biocontrol of Alternaria alternata in tomato

Abstract

Alternaria alternata is a pathogenic fungus that affects tomato plants. It is a significant concern in agriculture and controlling its spread is crucial. The use of fungicides has been the primary method for controlling A. alternata, but there is growing consumer concern about pesticide residues in food. As a result, researchers have been exploring alternative methods, including biological control and environmentally friendly compounds. Microbial consortia composed of carefully selected and compatible beneficial microorganisms, including bacteria and fungi, have been shown to effectively control foliar diseases in tomato plants. These microbial consortia display an extended functionality and versatility in the biocontrol of a wider range of plant diseases, including foliar diseases. They can control pathogens through diverse mechanisms and application methods, such as direct antagonism or induced systemic plant resistance. The objectives of the present workwere to evaluate the biocontrol effect of Trichoderma harzianum ITEM 3636 and Pseudomonas putida PCI2, applied at the root level, on the severity of tomato leaf blight caused by A. alternata, and to determine if the inoculated plants show a strengthening of the production of defense enzymes.