不同杀菌剂及其喷施次数对连作旱地花生叶斑病和产量的影响

Effects of Different Fungicides and Spraying Times on Leaf Spot Disease and Yield of Continuous Cropping Peanut in Dryland

本研究以海花1号为材料,在连作4年花生的旱地进行试验,通过在花生生育中后期分别喷施多福、代森锰锌、阿米妙收,研究不同杀菌剂及其喷施次数对连作旱地花生叶斑病、干物质量、产量及其构成因素的影响。结果表明,喷施杀菌剂提高连作花生叶片SPAD值和叶面积指数,显著降低叶斑病病情指数,增加叶和荚果干物质量,提高植株干物质量(14.9%~23.2%)、单株饱果数和百果重,增产9.3%~14.8%,进而提高了收获指数。药剂喷施3次处理对叶斑病防控和增产效果优于喷施2次处理。喷施阿米妙收的花生叶斑病病情指数最低,产量较喷施多福和代森锰锌分别提高5.0%和3.6%。

In this study,Haihua 1 was used as experimental material and the effects of different fungicides(carbendazim+thiram,mancozeb,azoxystrobin·difenoconazole)and spraying times on leaf spot disease,dry matter,yield and yield components of peanut in dryland which continuously cropped for 4 years were studied.The results showed that spraying fungicides increased the SPAD value and leaf area index,significantly reduced the disease index of leaf spot,increased the dry matter of leaves and pods,and increased the dry matter of plant by 14.9%~23.2%.The number of full pods per plant and the hundred-pod weight increased,and the yield increased by 9.3%~14.8%,so the harvest index was improved.The effects of spraying fungicides three times on controlling leaf spot disease and increasing yield were better than those of spraying two times.Compared with spraying carbendazim+thiram and mancozeb,the disease index of leaf spot was lower and the peanut yield increased by 5.0%and 3.6%respectively after spraying azoxystrobin·difenoconazole.