Management of ratoon stunt: effect of current thermotherapy on yield of sugarcane and control of Leifsonia xyli subsp. xyli

• Grant number: 17/18469-6
• Support Opportunities: Regular Research Grants
• Start date: June 01, 2018
• End date: August 31, 2020
• Field of knowledge: Agronomical Sciences - Agronomy - Plant Health
• Principal Investigator: Alfredo Seiiti Urashima
• Grantee: Alfredo Seiiti Urashima
• Host Institution: Centro de Ciências Agrárias (CCA). Universidade Federal de São Carlos (UFSCAR). Araras , SP, Brazil
• Associated researchers: Luis Eduardo Aranha Camargo ; Rodrigo Gazaffi

Abstract

Ratoon stunt (RSD), caused by Leifsonia xyli subsp. xyli (Lxx), is one major disease in many sugarcane-producing countries due to yield loss and difficulty of control. The use of clean seedcane is an important step towards successful control of RSD because contaminated propagating materials is the sole source of primary inoculum. Hot water treatment is the most employed method to eliminate Lxx. Nevertheless, thermotherapy in Brazil usually employs 52°C for 30min, instead of 50ºC/2h, because larger amount of seedpieces can be treated. The problem is that Lxx is not completely eliminate. Thus, one important issue to clarify is the cost/benefit of the two conditions: (50ºC/2h), which provides better control of Lxx but it might have harmful effect on bud germination or (52°C/30min), which provides lesser control of Lxx with no deleterious effect. Therefore, this work aims to answer the following questions: 1) How important RSD is on currently cultivated sugarcane varieties?; 2) What are the positive features (on Lxx control and yield) and negative ones (on bud germination and seedling growth) when 50ºC/2h is adopted?; 3) What are the positive and negative consequences when the traditional thermotherapy (52°C/30min) is employed?; 4) Does the titer of Lxx affect efficacy of thermotherapy? (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

ANDREATO, CAROLINE; GAZAFFI, RODRIGO; AGUIAR OLIVEIRA, MAYSA MARIANO; ARANHA CAMARGO, LUIS EDUARDO; URASHIMA, ALFREDO SEIITI. Effect of thermotherapy, Leifsonia xyli subsp. xyli titres, sugarcane genotype and diagnostic techniques on ratoon stunt control in Brazil. Journal of Applied Microbiology, v. N/A, p. 12-pg., 2022-06-29. (19/11424-2, 17/18469-6)