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Examination and characterization of key factors to seasonal epidemics of downy mildew in native grape species Vitis davidii in southern China with the use of disease warning systems

  • T. Yi
  • Y. Hong
  • M. Li
  • X. LiEmail author
Article
  • 51 Downloads

Abstract

Spine grape (Vitis davidii) is a major native grape species cultivated in south central China, and the industry is threatened by downy mildew outbreaks caused by Plasmopara viticola in this rainy and warm region. To examine and characterize the local epidemics of this disease in this region, experiments were conducted in Jingzhou in 2012–2013 with variety ‘Gaoshan-2’ and Zhongfang in 2013–2016 with variety ‘Xiangzhenzhu’ in Hunan Province. The number of diseased leaves with new infections (DL_Sum) and disease severity were assessed every 5 days. First, we used a mechanistic simulation model originally developed in Europe to simulate the primary inoculum seasons in these years and found that they ended in early May, suggesting little influences from oospores to the disease in summer. Then we used negative binomial regression to model the temporal changes of DL_Sum in summer. The predictive variables included weather variables and two disease risk indices derived based on two other empirical disease warning systems developed in Europe and North America. Relative humidity (RH) was identified the best predictive variable among all variables. Ordinal logistic regression identified mean temperature and days of heavy rainfall (>7 mm) as key weather factors for disease development. In general, RH was more important for infection process, and temperatures and rainfall were more important for symptom development and spore dispersal. Canopy structures could also have significant effects on disease development. These results may help for the development of new disease warning or forecast systems more suitable for this disease in southern China.

Keywords

Negative binomial regression Ordinal logistic regression Plasmopara viticola Simulation model Wild grape 

Notes

Acknowledgements

We are grateful for local staff for the assistance in field survey. We also greatly appreciate Dr. X.F. Niu at the University of Missouri.

Funding

This study was funded by the Coordinated Research Program for Downy Mildew by the National Agro-tech Extension & Service Center (NAESC, Project No. 201203035) and the Shen-Long Visiting Scholar Program at Hunan Agricultural University.

Compliance with ethical standards

Conflict of interest

The authors have no conflict of interest to declare.

Human and animal studies

The study did not have human participants or animals involved.

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Copyright information

© Koninklijke Nederlandse Planteziektenkundige Vereniging 2019

Authors and Affiliations

  1. 1.College of Plant Protection & Hunan Provincial Key Laboratory for Biology and Control of Plant Diseases and Plant PestsHunan Agricultural UniversityChangshaChina
  2. 2.Huaihua Agrometeorology Experimental StationHuaihuaChina
  3. 3.Department of Plant Pathology and MicrobiologyIowa State UniversityAmesUSA

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