Effect of tillage depth on the incidence of rice blast and rice sheath blight
The experiment was carried out in the rice field in Harbin,Heilongjiang Province.Tillage depths of 10,20,and 30 centimetres were set up to simulate the three principal tillage methods employed in the local area.The incidence of rice blast and sheath blight was investigated following the treatment,and the relationship between tillage depth and the occurrence of these two diseases was discussed.The results showed that the lowest incidence of leaf blast was observed in the 30 cm ploughing treatment,with a rate of 18.00％at the end of the initial infection and 75.67％at the end of the reinfection.The lowest incidence rate of panicle neck blast was observed in the 30 cm ploughing treatment,which was 20.33％at the end of the initial infection.The incidence rate of rice sheath blight was the lowest in the 30 cm ploughing treatment,which was 9.33％at the end of the initial infection and 22.00％at the end of reinfection.The consistent results indicated that the deep tillage method,simulated with 30 cm ploughing,was more conductive to the ecological management of rice blast and sheath blight.
tillage depthrice blastrice sheath blightecological prevention and control
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