Effects of Different Fungicides on Major Fungal Diseases and Quality of Rice in Coastal Region

LIU Yu; YU Yahui

doi:10.15933/j.cnki.1004-3268.2017.10.015

Abstract：In order to screen fungicides controlling major fungal diseases effectively and affecting the quality of rice less in coastal region,the effects of 5 fungicides on the major fungal diseases and quality of rice were studied.The results showed that the control efficacy of 25％ pyraclostrobin against rice blast and rice false smut was the highest,with 92.11％ and 96.37％ respectively.The control efficacy of 75％ trifloxystrobin · tebuconazole against rice blast and rice false smut was 86.95％ and 95.62％,slightly less than 25％ pyraclostrobin.The control efficacy of 24％ thifluzamide against sheath blight was best (89.25％).20％ tricyclazole was the least effective against the major fungal diseases.The theoretical yields of 25％ pyraclostrobin and 75％ trifloxystrobin · tebuconazole treatments were 9 467.22 kg/ha and 9 204.57 kg/ha rcspectivcly,significantly higher than that of other treatments.Applying fungicides could improve processing quality,however,it resulted in the increase of chalky rate and chalkiness,and the decrease of appearance quality.Use of fungicides also led to the increase of the content of amylose and protein,and reduced rice cooking quality.In addition to 20％ tricyclazole,25％ pyraclostrobin and 75％ trifloxystrobin · tebuconazole affected the rice cooking quality relatively less,and the taste value was higher.In summary,25％ pyraclostrobin and 75％ trifloxystrobin · tebuconazole were excellent fungicides to ensure high yield and good quality of rice.