Occurrence, Damage and Control Index of Rape Sclerotinia sclerotiorum in Mechanical Direct See- ding Fields

• 作者: Huifu WANG Liequan ZHONG Sengfu XU
• 来源期刊: Plant Diseases and Pests(植物病虫害研究：英文版)
• 学科: 农学
• 关键词: 油菜菌核病 疾病控制 机械直播 产量损失率 病情指数 危害 早期阶段 实时监测
• 年，卷（期）: 2012,（3）
• 页码范围: 12-15
• 页数: 4页
• 分类号: S435.654

摘要

Real-time monitoring and investigation in fields showed that the disease starting period of Sclerotinia sclerotiorum in mechanical direct seeding fields was earlier.Disease conditions rose with the advancing growth stage,which grew more quickly during the early stage of anthesis,flower withering period and early silique mature period.Yield loss rate increased with the increasing stem disease rate and disease index.Yield loss rate(Y 1) had extremely significant correlation with stem disease rate(X 1) and disease index(X 2),and the related models were Y 1 = 0.544 330 2X 1-2.316 1(n = 14,r = 0.986 0 **) and Y 1 = 0.673 408 X 2 1.016 4(n = 14,r = 0.977 2 **),respectively.Disease control indexes for one time control against S.sclerotiorum in mechanical direct seeding fields were stem disease rate as 11.8% and disease index as 7.6,respectively.The control indexes for twice control against the disease were stem disease rate as 16.8% and disease index as 11.7.This paper provided a new scientific basis for preventing S.sclerotiorum in mechanical direct seeding fields.