辽宁花生褐斑病发生及时间流行动态模型研究

为明确辽宁地区花生褐斑病发生危害及流行规律，以期指导病害防治，采用五点取样法，对辽宁省不同产区及不同品种花生褐斑病进行调查。2011年和2012年系统调查结果表明：不同产区病害均有发生，沈阳产区病害发生严重，兴城地区病害发生较轻，且多数产区2012年病情指数高于2011年。不同品种间病情指数也存在较大差异，其中四粒红最重，白花生最轻。通过SAS软件分析表明，Logistic模型能够较好地描述花生褐斑病病情指数随时间流行动态。

Occurrence and epidemic dynamics of early leaf spot of peanut in Liaoning Province

To guide the control of peanut early leaf spot in fields,the disease damage and the epidemic dynam-ics were studied.The different region and different varieties of peanut leaf spot in Liaoning Province was investiga-ted by the method of five point sampling.A systematical investigation on the disease was carried out in 201 1 and 2012.The results showed that the diseases have occurred in different peanut production areas.Shenyang was the worst infected area and Xingcheng area was less infected.The disease index in 2012 was higher than in 201 1 in most areas.Different varieties had different disease index,the highest disease index was Silihong,the least disease index was Baihuasheng.Through comparing and analyzing,Logistic model could reflect the temporal dynamic of peanut early leaf spot disease well.