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introduction to plant pathology

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introduction to plant pathology

  1. 1. MIC 319 FUNDAMENTALS OF AGRICULTURAL MICROBIOLOGY CHAPTER 1 INTRODUCTION TO PLANT PATHOLOGY BY SITI NORAZURA JAMAL 03 006/ 06 483 2132 norazura6775@ns.uitm.edu.my
  2. 2. Outline • Plant pathology definition • Plant disease definition • Plant diseases classification
  3. 3. PLANT PATHOLOGY
  4. 4. PLANT PATHOLOGY • Also be referred as “PHYTOPATHOLOGY”. • A science that study plant disease • The disease are caused by pathogens (infectious diseases) and environmental conditions (physiological factors) • Improve the chances of plant survival
  5. 5. PLANT DISEASE
  6. 6. Definition “ A malfunctioning process that is caused by continuos irritation and produce symptoms” (Horsfall & Cowling) “ A deviation from normal growth or structure of plants that is sufficiently pronounced and permanent to produce visible symptoms or to impair quality and economic value” (Stakman & Harrar)
  7. 7. Definition Healthy plant • The ability to carry out normal physiological functions at a acceptable level consistent to genetic potential Sick/diseased plant • A multifunctioning process that is caused by continuous irritation and produce symptoms
  8. 8. Healthy plant • Normal physiological functions include:  Normal cell division, differentiation & development  Absorption of water and minerals from the soil and translocation  Photosynthesis and translocation of photosynthesis  Utilization and storage of photosynthates  Reproduction
  9. 9. Healthy plant
  10. 10. Sick/diseased plant • A plant would not have all of these at once. • Plant disease is any disruption (biotic or abiotic) of the plants normal metabolism.
  11. 11. Sick/diseased plant “ the malfunctioning of host cells and tissues that results from their continuous irritation by a pathogenic agent or environmental factor and leads to the development of symptoms. “ disease in a condition involving abnormal changes in the form, physiology, integrity, or behavior of the plant.’ “ such changes may result in partial impairment or death of the plant or its parts’ (George N.Agrios)
  12. 12. Sick/Diseased plant
  13. 13. Healthy plant vs diseased plant
  14. 14. Plant diseases classification
  15. 15. Classification of plant disease Infectious Non infectious
  16. 16. Infectious disease • A disease that is caused by a pathogen that can spread from a diseased to healthy plant • Disease that is caused by living organism . • E.g. Pectobacterium atrosepticum (potato pathogen)
  17. 17. Non infectious disease • Disease that is caused by non living organism • Could not be spread to other healthy plant • E.g. factors:  Too low/high temperature  Lack/excess of soil moisture  Air pollution  Nutrient deficiencies  Mineral toxicities  Soil acidity or alkalinity

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