Intervalo de pulverização de nanocristais no controle da mancha bacteriana (Xanthomonas spp.) do tomateiro

Abstract

Bacterial spot in tomato plants, caused by Xanthomonas spp., may cause significant losses in crop production, and nanoparticles emerge as a new resource for plant protection. Thus, we aimed to evaluate the performance of nanoparticle spraying intervals to control Xanthomonas spp. in tomato plants. Tomato plants of the Santa Cruz Kada cultivar featuring 3 to 4 trefoils were initially sprayed with nanoparticles (ZnO:1Mg, ZnOCl and ZnOCl:0.1Cu), copper hydroxide and water. Three days later, the plants were sprinkled with a bacterial suspension (109 CFU/mL). Then, after 3, 6, 9 or 12-day intervals, the plants were sprinkled with the products again. The bacterial spots were analyzed in terms of severity, and the area under the disease progress curve (AUDPC). The plants showed less incidence of disease (AUDPC) when sprayed with ZnO:1Mg nanoparticles at the 3-day interval. When sprayed with nanoparticles at 3 and 6-day intervals, tomato plants showed less severe bacterial spots, which makes these intervals adequate to control the disease.