Controlling efficiency against clubroot disease of rapeseed by mixed-cropping of susceptible and resistant cultivars

China Abstract: In recent years, rapeseed clubroot disease has spread widely in China, and the cost of the chemical control is high while the efficiency is low. Using resistant varieties is the most economical and efficient way to control this disease. Mixed-cropping different resistant varieties can improve the control efficiency of crop diseases, but the research on it has not been reported. In two naturally-infested locations of clubroot diseases in Jixi of Anhui province and Linxiang of Yunnan province, two pairs of susceptible and resistant cultivars were used (highly resistant variety Huashuang 5R mixed with highly susceptible variety Huashuang 5 and highly resistant variety Huayouza 62R mixed with highly susceptible variety Huayouza 62). Seeds of each pair were mixed at different ratios (10:0, 1:9, 2:8, 3:7, and 0:10) and sown in the two locations respectively. The incidence rate was surveyed after occurrence of clubroot disease. The mixed-cropping at different ratios of susceptible and resistant cultivars decreased the incidence and disease index of clubroot disease, and stabilized the yield and quality of rapeseed. The actual incidence rate in the mixed cropping treatment increased with the decrease of resistant cultivar proportion, which was from 5.7% to 17.1% at Jixi from 4.4% to 32.1% at Linxiang for Huashuang 5R/Huashang 5, while from 5.7% to 18.6% at Jixi and from 2.1% to 12.0% at Linxiang for Huayouza 62R/Huayouza 62 respectively, and significantly lower than the theoretical disease incidence rate. The relative effectiveness of mixture of the two pairs of cultivars were lower than 1, which indicates that the mixed-cropping of susceptible and resistant cultivars has positive effect. This study mainly clarified the control effect of mixed-cropping two different Near-isogenic lines with different resistance levels on clubroot disease, which can provide new ideas and countermeasures for the prevention of clubroot disease.

• Publication year

  2020

• Venue

  ACTA AGRONOMICA SINICA

• Publication date

  2020-01-13

• Fields of study

  Agricultural and Food Sciences, Biology

• Identifiers
  DOI 10.3724/sp.j.1006.2020.94145
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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