Chapter 26

Greenhouse Disease Management

(book excerpts)

Plant diseases pose a major threat to horticultural crops grown in greenhouses. High relative humidity (RH) and the presence of a film of water on susceptible plant organs for long periods of time provide favorable conditions for the germination of conidia and infection by many pathogens: bacteria, fungi and viruses. Fungal diseases are plant infections caused by fungi. Fungi can be single or multicellular, but either way infect plants by stealing nutrients and breaking down tissue. Bacteria are microscopic, single-celled prokaryotic organisms, without a defined nucleus, that reproduce asexually by binary fission (one cell splitting into two). Viruses are sub-microscopic, infectious particles that multiply only inside living host cells. When disease management is neglected, pathogen populations build up and continue to increase as long as there is susceptible plant tissue available for infection and disease development. Successful crop production requires that crop diseases be managed so that the effects of diseases on the plants are minimized. The management of crop diseases is directed at preventing the establishment of diseases and minimizing the development and spread of any diseases that become established in the crop. Integrated disease management that is based on cultural, biological, biorational, and chemical controls is suggested strategy for keeping plants healthy in greenhouse cropping systems.

Click on the following topics for more information on greenhouse disease management.

Topics Within This Chapter:

  • Typical Plant Disease Symptoms
  • Leaf Spots
  • Rusts
  • Canker
  • Root Rots
  • Viral Diseases
  • Other Diseases
  • Greenhouse Fungal Diseases
  • Black Rot
  • Disease Cycle
  • Symptoms
  • Cultural Management Strategies
  • Chemical Management Strategies
  • Botrytis Blight
  • Disease Cycle
  • Symptoms
  • Cultural Management Strategies
  • Chemical Management Strategies
  • Downy Mildew
  • Disease Cycle
  • Symptoms
  • Cultural Management Strategies
  • Chemical Management Strategies
  • Fungal Leaf Spots
  • Disease Cycle
  • Symptoms
  • Cultural Management Strategies
  • Chemical Management Strategies
  • Fusarium Root and Stem Rot
  • Disease Cycle
  • Symptoms
  • Cultural Management Strategies
  • Chemical Management Strategies
  • Phytophthora Root Rot
  • Disease Cycle
  • Symptoms
  • Cultural Management Strategies
  • Chemical Management Strategies
  • Powdery Mildew
  • Disease Cycle
  • Symptoms
  • Cultural Management Strategies
  • Chemical Management Strategies
  • Pythium Root Rot
  • Disease Cycle
  • Symptoms
  • Cultural Management Strategies
  • Chemical Management Strategies
  • Rhizoctonia Root Rot
  • Disease Cycle
  • Symptoms
  • Cultural Management Strategies
  • Chemical Management Strategies
  • Rusts
  • Disease Cycle
  • Symptoms
  • Cultural Management Strategies
  • Chemical Management Strategies
  • Sclerotinia Disease
  • Disease Cycle
  • Symptoms
  • Cultural Management Strategies
  • Chemical Management Strategies
  • Greenhouse Bacterial Diseases
  • Bacterial Leaf Spots
  • Disease Cycle
  • Symptoms
  • Cultural Management Strategies
  • Greenhouse Viral Diseases
  • Symptoms
  • Cultural Management Strategies
  • Common Greenhouse Plant Viruses
  • Impatiens Necrotic Spot Virus (INSV)
  • Cucumber Mosaic Virus (CMV)
  • Tobacco Mosaic Virus (TMV)
  • Tomato Spotted Wilt Virus (TSWV)