Application of sonicated extracts of cyanobacteria and microalgae for the mitigation of bacterial canker in tomato seedlings

Abstract Microalgae and cyanobacteria could play an important role in crop protection, since they produce bioactive substances that promote plant growth and/or trigger the resistance mechanisms. The present study focuses on control of bacterial canker caused by Clavibacter michiganensis subsp. tomato plants using sonicated extracts from microalgae genera Leptolyngbya , Nostoc Chlorella Scenedesmus . For development this study, 8 strains were firstly tested for their capacity to inhibit C. vitro, as well cytokinins salicylic acid. In order discard those more phytotoxic strains, germination index was also estimated watercress seeds. -677 -1267 selected first phase based pesticide phytostimulant vitro. Subsequent bioassays seedlings showed root application be aimed at controlling disease while foliar Leptolyngbya- 1267 seems related strengthening through acid route. These preliminary results serve basis a deeper characterization biopesticidal biostimulant effect both reveal benefits derived combination capacities.