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What is Plant Pathology or Phytopathology?. Plant Pathology Plant Pathology or Phytopathology Phytopathology is the study of plant diseases.

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Presentation on theme: "What is Plant Pathology or Phytopathology?. Plant Pathology Plant Pathology or Phytopathology Phytopathology is the study of plant diseases."— Presentation transcript:

1 What is Plant Pathology or Phytopathology?

2 Plant Pathology Plant Pathology or Phytopathology Phytopathology is the study of plant diseases.

3 Did you know that plants have diseases and get sick just like people and animals do?

4 Most people don’t realize that plants are affected by infectious diseases caused by living Plant organisms (called Plant Pathogens Pathogens).

5 Infectious plant fungi, pathogens include fungi, bacteria, nematodes, viruses, and parasitic plants.

6 Plant Diseases are also caused by non-living or abiotic causes such as air pollution, nutrient deficiencies and various environmental factors.

7 Are Plant Diseases Important? Are Plant Diseases Important? YOU BET THEY ARE!!!

8 All of our food, much of our clothing, building materials, and much of the beauty in nature is provided by plants.

9 Plant diseases are a constant threat to the world’s food and fiber crops, forests, and landscape plants.

10 Throughout history, plant diseases have been responsible for the death and suffering of millions of people and countless animals.

11 A few examples of devastating diseases are: Potato Late Blight 1. Potato Late Blight Ergot of Rye 2. Ergot of Rye Black Stem Rust of Wheat 3. Black Stem Rust of Wheat Southern Corn Leaf Blight 4. Southern Corn Leaf Blight Dutch Elm Disease 5. Dutch Elm Disease Bacterial Canker on Citrus 6. Bacterial Canker on Citrus Plum Pox Virus on Stone Fruit 7. Plum Pox Virus on Stone Fruit All of these are infectious diseases caused by plant pathogens.

12 important plant diseases Let’s take a closer look at a few of these important plant diseases

13 Late Blight of Potato Late Blight of Potato Caused by the fungus Phytophthora infestans The fungus killed most of the potatoes grown in Ireland during the mid 1800’s. Potatoes were the main source of food for the Irish people. This plant disease resulted in the Irish Potato Famine of million people died 1.5 million people left Ireland

14 Late Blight on Potato Tubers

15 Ergot of Rye Ergot of Rye Caused by the fungus Claviceps purpurea The pathogen produces a structure called a sclerotium that grows in place of the rye kernel. This sclerotium contains poisons that are very harmful to man and animals. Ergotism. The sclerotium is harvested with the rye grain. The grain is ground into flour, made into bread and is eaten by people. Eating the contaminated bread results in a disease called Ergotism. ERGOTISM OFTEN RESULTS IN DEATH.

16 Ergot of Rye (note dark sclerotia)

17 Ergot of Rye The scelotia also contains hallucinogenic Fire compounds. People that eat ergot often see Fire. In the middle ages, people called the vision of fire induced by Ergot Holy Fire or St. Anthony’s Fire Ergotism can also cause abortions and gangrene. THIS PLANT DISEASE IS STILL KILLING PEOPLE IN THE WORLD TODAY

18 Black Stem Rust of Wheat Destroyed 300 million bushels of wheat in the United States and Canada Destroyed 135 million bushels in Dakotas and Minnesota SPORATIC EPIDEMICS STILL COST NORTH AMERICAN FARMERS BILLIONS OF DOLLARS

19 Black Stem Rust of Wheat

20 Southern Corn Leaf Blight An epidemic caused a 15% loss of the U.S. corn crop. This resulted in a one billion dollar loss in the United States. This was enough corn that, if fed to cattle, it would make 30 BILLION HAMBURGERS

21 Southern Corn Leaf Blight SusceptiblePlants ResistantPlants

22 Plum Pox Virus Plum Pox Plum Pox is caused by a virus and is a very serious disease that infects all stone fruit. - It is estimated that 100 million stone fruit trees are infected with the virus in Europe. - Infected trees become nonproductive and must be removed. This results in tremendous economic losses to stone fruit producers.

23 Plum Pox Virus

24 In 1999, the virus was identified on peach trees in Pennsylvania. This is the first observation of the virus in North America. The virus was probably introduced into the U. S. in an infected tree or budwood. The disease is a major threat to stone fruit production throughout North America. At present, plant pathologists and regulatory agencies are trying to eradicate the virus.

25 Plant diseases cause an 8 billion estimated loss of 8 billion dollars dollars per year in the United States alone.

26 What Can We Do About Plant Diseases?

27 Plant Pathologists We rely upon Plant Pathologists to provide information about plant diseases and how to manage them.

28 Plant Pathologist A Plant Pathologist is a professional who specializes in plant health much as a physician specializes in human health or a veterinarian in animal health.

29 Controlling plant diseases and keeping plants healthy Controlling plant diseases and keeping plants healthy is the main objective of a plant pathologist.

30 Controlling plant disease requires an understanding of the agents that cause disease as well as an understanding of how plants are affected by disease.

31 botany, microbiology, horticulture, crop science, soil science, ecology, genetics, biochemistry, molecular biology, and physiology, Through college courses in botany, microbiology, horticulture, crop science, soil science, ecology, genetics, biochemistry, molecular biology, and physiology, students receive the necessary background for exciting careers in the interdisciplinary science of plant pathology.

32 Plant pathologists are employed by colleges and universities, state and federal agencies, industrial firms, international institutes, and as private practitioners.

33 Most Plant Pathologists are members of The American Phytopathological Society (APS)

34 APS APS is an international scientific organization devoted to the study of plant diseases and their control.

35 The society has a membership of nearly 5000 plant pathologists and other scientists located in 80 countries worldwide.

36 The common goal of APS and Plant Pathologists worldwide is to develop and promote knowledge about plant diseases and their control.

37 HEALTHY PLANTS HEALTHY AND HAPPY PEOPLE We should all remember that we need HEALTHY PLANTS in order to have HEALTHY AND HAPPY PEOPLE.


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