Radiação ultravioleta pulsada no controle da podridão -por-Fusarium em melão amarelo

Abstract

With a growing and demanding market for high quality, residue-free fruits. Alternative techniques for protection of post-harvest fruit treatments have been necessary to ensure good quality and safe fruits. At this point the use of pulsed ultraviolet radiation (UVp) has acquire space as an efficient, clean and safe technique. The objective of this work was to evaluate the efficiency of UVp in the control of rot-by-Fusarium in yellow melon. The isolates LPPC 28, LPPC 74, LPPC 76 and LPPC 77 were evaluated using the isolates of pure colonies from the collection of fungi from the Post-harvest Pathology Laboratory at the Embrapa Tropical Agroindustry at doses of 0.0 J.cm-2; 4.8 J.cm-2; 7.8 J.cm-2; 10.8 J.cm-2; 13.8 J.cm-2 of UVp. Considering the in vitro results and LPPC 76 isolate was selected for in vivo evaluation of the doses of 0.0 J.cm-2; 6.0 J.cm-2; 9.0 J.cm-2; 12 J.cm-2 of UVp in artificially inoculated fruits. Inhibition of colony-forming units in 98% at the dose of 7.8 J.cm-2 of UVP-C either a prominent control from the 4.8 J.cm-2 dose of UVp in vitro was observed. The use of UVP-C reduced by more than 70% the incidence of the disease in melon fruits at the dose of 9.0 J.cm-2 of UVp, however at the dose of 6.0 J.cm-2 of UVp presented significant activity in the control of rot-by-Fusarium. The use of UVp demonstrated a lethal effect on the colony forming units of Fusarium spp. and evident control of Fusarium rot in yellow melons.