Research and Application of Classification Standard of Rice False Smut
TANG Chun sheng 1,GAO Jia zhang 1,CAO Guo ping 1,HUANG Shou xing 1, LIU Er ming 2,LIU Cheng long 3,XIE Wei 4,LUO Xue yi 4,XIAO Qing 4 (1.Agricultural Bureau of Hengyang,Hengyang,421001,PRC;2.Plant Protection Institute,Hunan Academy of
The distribution of different yellow greenish spore balls of false smut on single panicle was observed. A new classification standard based on the number of spore balls per panicle,0 no symptom observed,Ⅰ 1 spore ball,Ⅱ 2 spore balls,Ⅲ 3~5 spore balls,Ⅳ 6~9 spore balls,and Ⅴ more than 10 spore balls was established. It was obtained according to the quantitative classification with these indexes,ratio of spore ball in length and width , weight of 100 spore balls, weight of the filled grains per panicle, seed setting rate and yield loss rate. The diseased index of rice false smut could be described with Weibull's model.
【CateGory Index】： S431