Plant Diseases

• What should you be able to describe by the end of the video?

  How to diagnose diseases in plants
• What are plant pathogens?

  Organisms that cause diseases in plants
• What causes Rose black spot?

  A fungus
• How can plants be attacked besides pathogens?

  By insects that extract nutrients
• What do aphids do to plants?

  Extract nutrients such as sugars
• Why are insects not considered pathogens?

  They do not cause infectious diseases
• What are some symptoms of plant diseases?

  Discoloration, stunted growth, decay
• How can we diagnose plant diseases?

  Using manuals, labs, or testing kits
• What is one method to identify a pathogen in plants?

  Taking the infected plant to a lab
• What are plant ion deficiency diseases?

  Diseases not caused by pathogens
• What ion deficiency causes stunted growth?

  A lack of nitrate ion
• Why is nitrate important for plants?

  It is needed for protein synthesis
• What condition does a lack of magnesium ion cause?

  Chlorosis
• What is magnesium required for in plants?

  To make chlorophyll
• How does chlorosis affect leaves?

  Leaves lose their green coloration
• What are the symptoms of plant diseases?

  • Discoloration of leaves
  • Stunted growth
  • Decay or rot
  • Malformed stems or leaves
• What are the methods to diagnose plant diseases?

  1. Use a garden manual or website
  2. Take the plant to a lab
  3. Use testing kits with antibodies
• What is the importance of learning plant ion deficiency diseases for exams?

  • Often comes up in exams
  • Essential for understanding plant health