不同穴密度和杀菌剂对水稻纹枯病田间防效研究

Field Control Effects of Different Planting Density and Fungicides on Rice Sheath Blight

为筛选出水稻栽培的最佳穴密度及高效低毒的化学药剂,通过田间试验,分别研究4种不同穴密度和6种杀菌剂对滨海碱地水稻纹枯病防效及产量的影响。结果表明:4株·穴^(-1)为最佳穴密度时,纹枯病的发病率、病情指数均较低;在设计药量下,6种杀菌剂均对纹枯病有一定的防治效果。但施用250g·L^(-1)吡唑醚菌酯乳油时,纹枯病的发病率为12.8%、病情指数3.5,防效极显著优于其它5种药剂。同时,具有极显著的增产效果,产量可达到10 747.5kg·hm^(-2)。

In order to screen out the best density of rice cultivation,high efficiency and low toxicity of chemical agents, the effects of different planting density and six kinds of fungicides on the control efficacy and yield of rice sheath blight were studied by field experiment. The results showed that 4 plants per point was the best density, the incidence of sheath blight disease and disease index were low; under the designed dose, six fungi- cides had a certain control effect on sheath blight. However, the application of 250 g· L-1 emulsion pyraclostrob- in,the incidence of sheath blight disease was 12.8% ,disease index was 3.5 ,the control effect was significantly better than the other five agents. At the same time,it had a significant effect to increase yield,the yield was up to 10 747.5 kg·hm-2.