南方锈病在鲜食玉米上的发生动态及其发生程度与产量的相关性

摘要

Field investigation was conducted to study the occurrence dynamics of southern rust in fresh corn production area in Guangzhou.In addition,hundred-grain weight was used as an important index to analyze the correlation between southern rust damage degree and fresh corn yield.Result showed that southern rust could occurre all year round during fresh corn growing period.The 2 occurrence peaks were in July and November. Southern rust damage could significantly reduce the hundred-grain weight of fresh corn.The regression analysis indicated that there was a significant negative correlation between hundred-grain weight of fresh corn and disease severity of southern rust.The regression equation wasy=-0.031x + 31.924.The hundred-grain weight would reduce by about 0.3 g,when southern rust severity increased by 10%.%采用田间调查的方法分析南方锈病在广州鲜食玉米产区的发生动态，并以鲜食玉米籽粒百粒重作为重要指标分析南方锈病为害程度与鲜食玉米产量性状的相关性。结果显示，在鲜食玉米生长期南方锈病可全年发生，并在7月和11月形成两个发病高峰；南方锈病为害可显著降低鲜食玉米百粒重，回归分析表明，鲜食玉米百粒重与南方锈病为害严重度呈显著负相关，回归方程为y=-0.031x +31.924，当南方锈病为害严重度每升高10%，则鲜食玉米籽粒百粒重将减少约0.3 g。