Plant Disease

• How do aphids damage plants?

  They extract sap and weaken the plant
• What role do aphids play as vectors?

  They transfer pathogens between plants
• What methods can reduce aphid populations?

  • Chemical pesticides
  • Biological pest control using ladybirds
• Why do plants need nitrate ions?

  Nitrates convert sugars into proteins for growth
• What happens if plants lack nitrate ions?

  Growth will be stunted
• Why do plants need magnesium ions?

  Magnesium is essential for chlorophyll synthesis
• What is the effect of magnesium deficiency on leaves?

  Leaves turn yellow due to chlorosis
• What are common symptoms of disease in plants?

  • Stunted growth
  • Spotted leaves
  • Decay/rotting
  • Growths
  • Malformation of stems/leaves
  • Discolouration
  • Presence of pests
• How can plant diseases be identified?

  • Reference to gardening websites/manuals
  • Laboratory testing
  • Monoclonal antibody test kits