辽宁花生网斑病发生危害及流行动态研究

Occurrence and epidemic dynamics of peanut web blotch disease in Liaoning Province

本研究旨在明确辽宁省花生网斑病的发生危害及流行规律,以指导田间病害防治。调查显示2011年辽宁各花生产区网斑病病田率为100%,病叶率32.9%～66.5%,病情指数11.1～35.5。葫芦岛、阜新、锦州发病较重,沈阳次之,铁岭发病最轻。不同品种花生网斑病病情严重度依次为四粒红>白沙1016>花育20>黑花生>白花生。通过SAS软件分析表明,Logistic模型能够较好地反映花生网斑病时间流行动态,并以此推导出病害流行阶段,病情指数增长最快为0.99/d。研究发现四粒红感病性较强,可作为流行学研究的良好试材。

Peanut web blotch disease （Phoma arachidicola Marasas） is one of the serious diseases in Liaoning peanut production and caused serious yield reduction by 30%. To guild the control of disease in fileds, the peanut web blotch disease damage and epidemic dynamics of peanut web blotch were studied. A systematical investigation on the disease was carried out in 2011. The results showed that the percentage of this disease fields was 100%, the percentage of diseased leaf was 32.9% to 66.5%, the disease index was 11.1 to 35.5. It occurred most seriously in Huludao, Fuxin and Jinzhou city, moderately in Shenyang and slightly in Tieling city. The order of disease se- verity among tested cultivars was Silihong 〉 Baishal016 〉 Huayu20 〉 Heihuasheng 〉 Baihuasheng. Through compa- ring and analyzing, Logistic model could well reflect the temporal dynamic of peanut web blotch disease. And the epidemic period could be deduced and the highest disease index increasing rate was 0.99/d. The Silihong was highly susceptible and could be used for disease epidemic studying.