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[Several infection factors of Pseudoperonospora cubensis]

Yanxia Shi1, Baoju Li, Xuemin Liu

  • 1Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, China. shiyx@mail.caas.net.cn

Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|April 28, 2005
PubMed

Insights

Cucumber downy mildew thrives in warm, humid conditions, with optimal temperatures between 25-35°C. High temperatures above 35°C can eliminate the Pseudoperonospora cubensis pathogen.

Area of Science:

  • Plant pathology
  • Environmental science
  • Mycology

Context:

  • Cucumber downy mildew, caused by Pseudoperonospora cubensis, is a significant agricultural concern.
  • Understanding the environmental factors influencing pathogen survival and infection is crucial for disease management.

Purpose:

  • To investigate the impact of temperature and humidity on the pathogenicity of Pseudoperonospora cubensis.
  • To determine the optimal conditions for cucumber downy mildew infection and pathogen survival.

Summary:

  • Optimal temperature for cucumber downy mildew occurrence is 25-35°C.
  • Alternating temperatures of 15/35°C promote Pseudoperonospora cubensis infection, while temperatures above 35°C are lethal.
  • As little as 2 hours of humidity is sufficient for infection.
  • The pathogen remains viable for infection after storage at -20°C for 10 months or drying for 7 days.
  • Infected cucumber leaves continuously produce sporangia, with higher quantities produced in vivo compared to in vitro.

Impact:

  • Provides critical data for predicting and managing cucumber downy mildew outbreaks.
  • Informs agricultural practices regarding temperature and humidity control for disease prevention.
  • Contributes to the understanding of oomycete pathogen survival strategies under adverse conditions.

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