桂中蔗区甘蔗生长前期螟虫抗性评价

为探明广西柳州和来宾市蔗区甘蔗螟虫的为害情况及品种抗性,为甘蔗品种的合理布局和螟虫的综合防控提供科学依据。采用定点和随机的方法,在甘蔗生长前期对广西柳州市和来宾市6个县级蔗区的主栽品种螟虫的发生情况进行调查及田间抗性综合评价。结果显示,不同蔗区、种植品种和植期对螟虫的抗性差异明显。2016年广西柳州和来宾蔗区新植蔗螟虫发生率为0~5.97%,宿根蔗螟虫发生率为0~16.49%。宿根蔗发生程度比新植蔗严重。ROC22在来宾市兴宾区发生最严重,其次为粤糖93-159。综合各个品种新植和宿根在不同蔗区的抗性表现,台优和ROC16表现为高抗,其中台优未见被螟虫为害,桂糖40号抗虫,桂柳二号和桂糖21号中抗,柳城05-136和粤糖00-236为中感,ROC22为感虫,而粤糖93-159为高感。聚类分析结果与综合评价的抗性表现一致。

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.