Efeito do estádio de maturação, tipo de inóculo e local de inoculação na severidade da podridão peduncular em manga

Abstract

The mango crop is one of the principal activities of Brazilian agribusiness, and it has grown steadily over recent years. Postharvest rots are responsible for great losses in fruit storage, with prominence to steam-end rot, caused by Lasiodiplodia theobromae and Fusicoccum parvum. The objective of this work was to compare isolates of the species L. theobromae and F. parvum on the aggressivity, inoculum type, inoculation place and state of ripeness in cv. Tommy Atkins. The aggressivity test was carried out with five isolates of L. theobromae and 10 isolates of F. parvum. Isolates L2 and L5 of L. theobromae and isolates F6 and F10 belonging to the species F. parvum were considered the most aggressive. These isolates were tested in relation to the state of ripeness (2; 2,5; 3; 4 and 5), inoculum type (disc of PDA containing structures of the plant pathogens and conidia suspension - 105 conidium/mL) and inoculation place (peduncle region and equatorial area) on the mango. In general, the more mature the fruit, the greater the severity of the disease for isolates of the two plant pathogens, independent of the place of inoculation and the type of inoculum. In the earliest states of ripeness the smallest lesions were observed when inoculated with conidium suspension. As for the inoculation place, no marked influence was observed for the isolates of the plant pathogens studied