RELIABILITY OF SUGARCANE RESISTANCE TESTS (SACCHARUM SPP. HYBRID): TESTS AGAINST BROWN RUST
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Abstract
Puccinia melanocephala, the cause of brown rust, is a damaging pathogen of sugarcane in most parts of the world where it is grown. One of the most effective strategies for its control is the use of resistant varieties. For this purpose, control cultivars are used in disease resistance tests, which allow the following categories to be distinguished: highly resistant, resistant, moderately resistant, moderately susceptible, susceptible, highly susceptible and very highly susceptible. The aim of this work was to investigate the effectiveness of sugarcane rust resistance trials conducted between 2020 and 2023 in classifying the resistance of new cultivars. Data from four locations and trials evaluating 16 commercial varieties were analyzed. The results showed that brown rust control remained stable throughout the study period and that five resistance categories were distinguished. Of the commercial cultivars studied, three are considered susceptible. The need for systematic monitoring of sugarcane plantations and training of phytosanitary staff, as well as systematic analysis of disease resistance tests, is demonstrated in order to provide timely recommendations and ensure the economic and sustainability of the crop.
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