27 Revista Agrotecnologia, Ipameri, v.7, n.1, p.27-32, 2016 doi: 10.12971/2179-5959/agrotecnologia.v7n1p27-32 Resumo: A termoterapia é o método mais adotado pelas usinas do setor sucroalcooleiro no controle da doença do raquitismo da soqueira (RDS), altamente prejudicial no desenvolvimento da cultura da cana de açúcar. Apesar de seus benefícios, a termoterapia pode reduzir o índice de brotação das gemas, prejudicando o desempenho da cultura. Este trabalho visou determinar o desempenho na brotação de gemas em condições de campo, usando delineamento inteiramente casualizado, em fatorial 5x2+1, com seis repetições, sendo os tratamentos constituídos de cinco cultivares de cana de açúcar (SP 5536; SP 3250; RB 7515; SP 1842; SP 2847), tratadas termicamente com duas temperaturas (50°C/2h e 52°C/30 minutos), mais uma testemunha - sem tratamento térmico. Verificou-se que houve diferença significativa entre os tratamentos térmicos e a amostra controle (testemunha). As cultivares apresentaram comportamento diferenciado entre si, tendo a cultivar SP 1842 obtido maior índice de crescimento de perfilhos. PALAVRAS-CHAVE: Leifsonia xyli. Saccharum officinarum. Raquitismo da soqueira. Melhoramento genético. Tratamento térmico. 1 Prof.ª Msc. Engenharia Agrícola, IFGoiano/Urutaí - GO, Rodovia Geraldo Silva Nascimento, Km. 2,5, Zona Rural, Urutaí - GO, CEP: 75790-000 - Brasil, rute.faria@ifgoiano.edu.br; 1 Prof.° Doutor, Engenharia Florestal, UEG/Ipameri - GO, coneglian@ueg.br; 1 Prof.° Doutor, Engenharia Agrícola, UEG/Anápolis - GO, itamar.texeira@ueg.br 1 Discente do curso de Engenharia Agrícola, IFGoiano /Urutaí - GO, amandarithieli@hotmail.com; 1 Discente do curso de Agronomia, IFGoiano/Urutaí - GO, alvarodeoliveira11@hotmail.com. Recebido: 13/06/2016 – Aprovado: 01/08/2016 Abstract: Thermotherapy is the method adopted by most plants of this departament to control against the infection of Sugar Cane Rickets (Ratoon Stunting disease, RSD) highly damaging to the crop sugar cane plants. Despite its benefits, the thermotherapy can reduce the budding index of its gems which can affect performance culture. This study aimed to determine the performance sprouting buds in field conditions using a completely randomized system in a factorial 5’x3’ subdivided plot, with six repetition and treatments consisted of five sugarcane cultivars (SP 5536; SP 3250; RB 7515; SP 1842; SP 2847), thermally treated with two temperatures (50°C/2h and 52°C/30 minutes) and another that was used without heat treatment - control. It was found that there was significant difference between the thermal treatment and the control sample (control). However, it was found that the varieties had different behaviors in the budding ability of gems due to the use of thermotherapy. It was found that some could suffer deleterious effects on budding and others were found to be benefiting from treatment. The SP 2847 and the SP 3250 varieties showed better indexes on the performance of budding compared to the others that were tested, but only when subjected to the regime of 50°C/2h, indicating a possible inductor and beneficial effect on their performance in the field. KEYWORDS: Leifsonia xyli, Sacchanarum officinarum, Ratoon stunting disease - RSD, Genetic improvement, Heat treatment. DESEMPENHO DA TERMOTERAPIA NA BROTAÇÃO DE MICROTOLETES DE CANA DE AÇÚCAR THERMOTHERAPY PERFORMANCE OF BUDDING SUGARCANE MICRO CUTTING Rute Quelvia de Faria 1 , Ademilson Coneglian 2 , Itamar Rosa Teixeira 3 , Amanda Rithieli Pereira dos Santos 4 , Álvaro de Oliveira Cardoso 5