Resistance identification of 18 varieties of kidney beans in Dalian area to root rot disease
In order to clarify the resistance level of kidney bean varieties to root rot in Dalian area,the resistance identifi-cation to root rot and agronomic traits evaluation of 18 kidney bean varieties were carried out by disease field experiments and inoculation experiments.The results showed that in the field experiments,all varieties showed disease symptoms,and the incidence had been increasing year by year;August Busy,Liannong Yufengjiadou and Liannong Delicacy No.2 had the lightest incidence,the average disease indexes'for two years were 12.96,13.70,and 15.19.In the inoculation experi-ments,there were 5 resistant(R)varieties,of which 3 showed significant differences in disease index compared to medi-um resistant varieties,including Liannong Yufengjiadou,Liannong Delicacy No.2 and August Busy,the disease indexes'were 27.11,28.44 and 28.89;there were 11 moderately resistant(MR)varieties,2 susceptible(S)varieties,and no immune(I)and highly resistant(HR)varieties.Based on the experimental results,three resistant varieties were identified,Lian-nong Yufengjiadou,Liannong Delicacy No.2 and August Busy not only have resistance to root rot,but also have excel-lent agronomic traits.They can be directly applied in production and can also be used as germplasm resources for im-provement and utilization of root rot resistance.
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