Biological control of anthracnose in green onions under organic production system

Abstract

The objective of this research was to evaluate methods of biological control of anthracnose in green onion production under organic cultivation. The experimental design was in randomized blocks with eight treatments and four replications of 3 lines with 6 plants each line, with the central plants considered useful in splits. The treatments used were Trichoderma asperelloides (FT10®/0.001g-60ml), Trichoderma harzianum and Trichoderma viride (Biotricho®/0.175g/m²), Trichoderma harzianum (Trichordermil®0.1ml/60ml), Trichoderma harzianum (UFAC isolate/105 spores mL^-1/field), Bacillus amyloliquefaciens (Chevelle®4g/80ml), biofertilizer (3%), efficient microorganisms (3%) and water (control). Classes began 40 days after planting using the weekly leaf-by-leaf method, with a total of seven in the spring experiment and five in the summer, harvesting and counting diseased and healthy leaves. Subsequently, fresh mass of commercial leaves, severity and yield per area were measured. There was no significant effect of treatments on the control of green onion anthracnose in the experiment during the spring and summer of Rio Branco, Acre.