Pathogen Dispersal and Glomerella Leaf Spot Progress Within Apple Canopy in Brazil.

Glomerella leaf spot (GLS) of apple is caused by three different species complexes. This study evaluated the dispersal of spores related to GLS temporal progress and defoliation. Spores were monitored by air and water runoff in different plant heights, and the temporal progress of GLS and defoliation were assessed.

Sensitivity of the Species Complex From Apple Trees in Brazil to Dithiocarbamates, Methyl Benzimidazole Carbamates, and Quinone Outside Inhibitor Fungicides.

Glomerella leaf spot (GLS) and bitter rot (BR) on apples are often caused by in Paraná State, Brazil. GLS control is difficult because of its rapid development, with an incubation period of only 2 days under favorable conditions. Therefore, producers use successive fungicide applications every season; however, failure to control GLS has been commonly reported.