甘蔗赤斑病的严重度与产量损失的关系  

RELATIONSHIP BETWEEN SUGARCANE YELLOW SPOT (CERCOSPORA) AND YIELD LOSS IN SUGARCANE CULTIVARS

作　　者：冯荣扬[1] 郭良珍[1] 

机构地区：[1]湛江海洋大学农学院,广东湛江524088

出　　处：《西南农业大学学报（自然科学版）》2000年第4期323-326,共4页Journal of Southwest Agricultural University

摘　　要：在田间自然发病条件下 ,比较粤西 1 0个甘蔗生产品种甘蔗赤斑病的发病程度与产量损失率。结果表明 :甘蔗品种间的发病程度和产量损失均有明显差异。增施氮肥后 ,甘蔗赤斑病严重度增加 ,但对产量的增加则因品种而异。在单株测定 7个甘蔗生产品种的病害严重度与产量损失的关系中获知 :用来衡量病害严重度的病级与产量损失之间有十分密切的关系 ,从而建立了病级 (x)与产量损失率 (y)之间的回归方程 :y=4.5 0 2 9x- 1 .5 2Ten sugarcane cultivars were tested under field conditions in West Guangdong for their susceptibility to sugarcane yellow spot (Cercospora) and the resulting yield loss (%). Conspicuous differences were noticed among the cultivars in disease severity and yield loss. Disease severity increased with N rate, but the influence of N application on yield varied with cultivar. Analysis of 7 cultivars showed a significant correlation between disease index and yield loss, and a regression equation was established: y=4.468x-1.412, where y represents yield loss and x disease index.

关 键 词：甘蔗 赤斑病 产量损失率 发病程度 

分 类 号：S566.1[农业科学—作物学] S435.661