3种新药剂总体防治水稻纹枯病、穗颈瘟的效果与应用技术

田间试验结果表明:25%吡唑醚菌酯EC、45%肟菌·己唑醇WG、10%嘧菌酯CS防治水稻纹枯病、穗颈瘟效果明显,适期用药1次对纹枯病、穗颈瘟的防效分别可达80%以上、85%~90%,值得在水稻防治纹枯病、穗颈瘟上推广应用。每667 m~2 25%吡唑醚菌酯EC、45%肟菌·已唑醇WG、10%嘧菌酯CS经济有效用量分别为70 mL、20 g、90 g,此剂量防病效果显著。防治纹枯病最佳用药适期为田间穴发病率5%左右时,兼治稻瘟病;防治水稻穗颈瘟病宜掌握在水稻破口抽穗5%~10%时,兼治水稻纹枯病。

Control Effect andApplication Technology of Three New Fungicides on Rice Sheath Blight and Rice Ear Neck Blast

Astract: The results of field trial showed that pyraclostrobin 25% EC, 45% trifloxystrobin+hexaconazole WG, 10% azoxystrobin CS had good effect to control rice sheath blight and rice ear neck blast. With once treatment in suitable period, the control effect reached above 80%, 85%~90% respectively, and indicated that it was worthy of extension and application. The optimum rates of these fungicides were 70 mL/667 m2, 20 g/667 m2, 90 g/667 m2 respectively. When the ratio of infected hole was about 5%, it was the optimum period of controlling rice sheath blight, as well as rice ear neck blast. When the rice rupturing and heading was 5%~10%, it was the optimum period of controlling rice ear neck blast, as well as rice sheath blight.