Plant Pathology Practical Exercise 3
Question form
You will need to reference the exercise itself to answer the questions. It would also have paid to check the LearnPest modules as well. The condition affecting the tree is covered in one of them. Answer the questions on a separate piece of paper and post it in, (conventionally or electronically) along with your answers to the other exercises.
Print this out, then return to the Diagnosis exercise .
| 1. | Which of the above conditions does Doug's apple trees have? (1 mark) |
| 2. | In the scenario overview it was observed that the worst affected trees were in the low lying areas. Why was this a significant observation? (2 marks) |
| 3. | What would you consider to be the most significant clue observed in the field. (1 mark) |
| 4. | The grower was asked several questions about the crop and it's management. Many of the replies held clues as to pre-disposing factors but what was the most significant clue? (1 mark) |
| 5. | Can you think of a reason as to why the neighbour's crops aren't as badly affected? (2 marks) |
| 6. | In the laboratory assessment, why do you think a fungus was found on the leaves? (2 marks) |
| 7. | Nematodes were found in soil around the roots, but it was obvious that they would not have caused the damage. Why is that? (2 marks) |
| 8. | What was wrong with the weeds? Does the weed damage have any relationship to what's affected the crop? (2 marks) |
| 9. | The fungus that grew out of the root in the lab analysis is an Oomycete. Name the two structures in the picture. (2 marks) |
| 10. | Finally, in your opinion, what should the grower now do about this problem and why (5 marks) |