MÉTODOS DE AVALIAÇÃO DE SEVERIDADE DE SEPTORIOSE NO TOMATEIRO E EFICÁCIA DE FUNGICIDAS

Abstract

The objective of this work was to study the comparison between two methods of determining the severity of septoria in sown tomato; and comparing the control efficacy of some of the most commonly used pesticides in the agricultural market when placed in ha-1 dose and dose concentration (dose to 100 L of water). The work was developed in the Advanced Experimental Field BASF S.A, located in the municipality of Uberlândia, MG, using tomato cultivar Absoluto type salad was planted. The experimental design was a randomized complete block design, with 13 treatments and four replications: T1 - Witness; T2-Piraclostrobin (0.3 kg p.c. in 100 L water); T3 - Tetraconazole + azoxystrobin (0.1 L p.c. in 100 L water); T4 - Meticonazole (0.1 L p.c. in 100 L water); T5 - Fluxapiroxade + pyraclostrobin (0.04 L p.c. in 100 L water); T6 - Propiconazole + diphenoconazole (0.05 L p.c. in 100 L water); T7 - Azoxystrobin + diphenoconazole (0.04 L p.c. in 100 L water); T8 - Piraclostrobin (3.0 kg p.c. ha-1); T9 Tetraconazole + azoxystrobin (1.0 L p.c. ha-1); T10 - Meticonazole (1.0 L L p.c. ha-1); T11 Fluxapiroxade + pyraclostrobin (0.3 L p.c. ha-1); T12 - Propiconazole + diphenoconazole (0.5 L p.c. ha-1); T13 - Azoxystrobin + diphenoconazole (0.4 L p.c. ha-1). Artificial inoculation with Septoria lycopersici sprayer at a concentration of 3.0 × 10 4 spores per mL was carried out after the fourth application of the fungicides. The degree of septoriosis control was evaluated using a diagrammatic scale and LeafDoctor application, based on digital image analysis every 7 days after the last application of fungicides, closing the evaluations at 21 days after the last application. The area under the disease progress curve (AACPD), which was submitted to analysis of variance for statistical comparison of treatments in terms of disease intensity. The fungicides fluxapiroxade + pyraclostrobin, in both dosage forms (T2 and T11), and tetraconazole + azoxystrobin (T3) were the most effective for controlling septoriosis. In general, the products applied at the concentration dose (for 100 L of water) were less effective compared to the dosages per hectare in these analyzes. Both the diagrammatic scale and the LeafDoctor provide similar results and are equally accurate in terms of quantification of the severity of septoriosis.