Resistance to Borer Infestation of Sugarcane Varieties During Early Growth Periodin Central Guangxi Province

To adequately allocate resistant varieties and implement an integrated control of borer infestation for sugarcane cultivation in the planting areas in Guangxi, field surveys were conducted in 6 counties of Liuzhou and Laibin. An analysis was followed to determine appropriate approaches for the borer control. It was found that the borer resistance of the plants as well as the infestation severity in the fields varied significantly according to the planting area, sugarcane variety and season under investigation. For instance, in 2016, the occurrence rates of seedlings with a withered-core on the newly planted sugarcane plants in the Liuzhou area ranged from 0 to 5.97%. And, they were much more severe on the ratoon plants which ranged from 0 to 16.49%. The most serious cases occurred to ROC22 followed by Yuetang 93-159 in Xingbin county of Laibin. Based on the resistance performances, the sugarcane varieties in the regions were classified as the "borer-free" Taiyou, the "highly borer-resistant" ROC16, the "resistant" Guitang 40, the "moderately resistant" Guiliu 2 and Guitang 21, the "moderately susceptible" Liucheng 05-136 and Yuetang 00-236, the "susceptible" ROC22, and the "highly susceptible" Yuetang 93-159. An identical grouping result was obtained by a clustering analysis.