ABSTRACT
Anthracnose of grapevine is a disease caused by the fungus Elsinoe ampelina, responsible for great damages to the crop. Plant protection by means of resistance induction has been viewed as an important alternative control measure. Resistance elicitors stimulate a series of reactions in the host for the production of metabolic compounds, providing protection to the plant against pathogens. The aim of this study was to evaluate the efficiency of biotic and abiotic resistance elicitors in the management of anthracnose for the cultivation of vine ‘Isabel’. The experiment in the field was carried out in the municipality of Natuba, Paraíba State, and fruits were analyzed in the Phytopathology Laboratory of Federal University of Paraiba, Areia. Treatments were: T1 – Control; T2 - Fungicide (Metiram + Pyraclostrobin); T3 - Potassium phosphite; T4 - AgroMos®; T5 – Fungicide + Potassium phosphite; T6 – Fungicide + AgroMos®, T7 - Potassium phosphite + AgroMos®; T8 – Fungicide + Potassium phosphite + AgroMos® composed of four replicates in randomized blocks. Applications were carried out at every seven days, totaling 12 applications during the crop cycle. Evaluations were done at every 15 days, considering nine leaves per plant. The analyzed variables were: incubation period, disease incidence and area below the disease progress curve. For physicochemical evaluations of fruits, the design was in randomized blocks, constituted of three clusters. The following were analyzed: bunch weight; bunch length and diameter; pulp yield; soluble solids; pH; titratable acidity and SS / TA ratio. Potassium phosphite applied alone or alternated with fungicide and/or AgroMos® on vines ‹Isabel› provided lower severity of E. ampelina. The length and the weight of grape bunches were positively influenced by potassium phosphite application. Potassium phosphite and AgroMos® applied either alone or in association did not affect pulp yield.
Keywords
Control; Elsinoe ampelina; incidence; postharvest
