Lanthanum in vitro control of Alternaria solani and induction resistance mechanism against blight tomato plant

Rare earth elements have been tested in control of plant diseases. Lanthanum (La) was the Alternaria solani (in vitro) and tomato early blight vivo) using concentration 0; 0.1; 0.2; 0.4 0.8 g L-1. In vitro, were diluted V8 culture medium evaluated for mycelial growth rate index (MGRI) pathogen sporulation. vivo, 24 hours after application inoculate inoculation, leaflets collected quantification, specific catalytic activity guaiacol peroxidase. The severity also analyzed. As 0.27 0.28 L-1 reduces 28% 50% MGRI sporulation, respectively. Peroxidase catalase increased by 298% 151% treated with 0.5 L-1de La, vivo AUDPC 70% when applied La. can be used as resistance inducer controlling blight.