POTENCIAL DE PRODUTOS BIÓTICOS E ABIÓTICOS COMO INDUTORES DE RESISTÊNCIA NO CONTROLE DE PODRIDÕES PÓS-COLHEITA EM MANGA, NO SUBMÉDIO SÃO FRANCISCO

Abstract

With the purpose to minimize the incidence of stem-end rot, mango, caused by Lasiodiplodia theobromae, Fusicoccum aesculi, and Colletotrichum gloeosporioides, five resistance inductors were tested under field conditions: (T1) absolute control (no treatment); (T2) Fosetyl-AL; (T3) Agromós; (T4) Calcium Phosphite; (T5) Potassium Phosphite: (K30) and (T6) Acibenzolar-S-methyl; which were compared to the control treatment, to the conventional treatment on the farm (T7) compound: Pyraclostrobin; Thiophanate methyl; Azoxystrobin; Difeconazole; Tebuconazole; Thiabendazol; Tetraconazole. The sprayings were performed using a knapsack sprayer in a total of seven applications with 15-day intervals. The statistical design was a randomized block design with seven treatments and four replications, with each plant being considered a repetition, totaling 28 plants. Incidence of post-harvest rot was obtained for 77.9% of the treated fruit. No significant difference between the tested resistance inducers was observed, not even regarding the control. However, the conventional treatment (T7), adopted by the farm, showed a 25% disease incidence only and diverged statistically from the others. Studying the etiology of the rot, high indices of C. gloeosporioides, with 75% incidence, were verified, followed by L. theobromae, F. aesculi, A. niger and Alternaria sp, with incidence of 11%, 5.5%, 2.7% and 1.3%, respectively. Moreover, 4.3% of non-identified micro-organisms were detected.