A multitude of attackers lies in wait

13 important questions on A multitude of attackers lies in wait

What might other reactions to plant tissue attacks be called?

- Reactions like necrotic flecks or lesions may be called symptoms.

What is not always a reliable indicator of the amount of pathogen present in a plant?

- Symptom intensity can be misleading for indicating pathogen quantity.
- Symptoms may not directly equate to pathogen levels.

How can many pathogens and parasites be identified in a plant?

- Pathogens and parasites may be partially visible.
- Identification is possible through signs and direct visibility.
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What is the consequence of an infection in plants according to the text?

- Infections alter the plant's physiology or tolerance.
- Pathogen quantity may not be proportional to symptom severity.

How can the local presence of a leaf blotch fungus be deduced?

- Local lesions imply leaf blotch fungus presence.
- Pathogen quantity is indirect by lesion size and number.

Why do the authors prefer to avoid the term disease for plant infections?

- The term 'disease' may not reflect the infection's impact on the whole plant.
- Infections can affect singular parts or the entire physiology.

How is the term 'pest' defined in the context of plants?

- 'Pest' indicates animal parasites and herbivores.
- White fly on tomato is provided as an example of a pest.

How are pathogens classified?

- Pathogens are classified based on the infection process.
- Diversity includes fungi like powdery mildew, rust, and loose smuts.

What is the role of haustoria in pathogenic fungi?

- Haustoria infiltrate plant cells without disrupting host cellular integrity.
- They may reprogram the plant's responses.

What are necrotrophs, and how do they interact with plant tissue?

- Necrotrophs are pathogens like Sclerotinia sclerotiorum and Botrytis cinerea.
- They kill plant tissue to extract nutrients.
- Often produce toxins and thrive on dead plant tissue.
- Can be grown on artificial media.

What characterizes hemibiotrophs, and what can happen to plant tissue during their infection?

- Hemibiotrophs, like Phytophthora infestans, are between biotrophs and necrotrophs.
- They can cause plant tissue death soon after infection.
- Some are cultivable on media (e.g., P. infestans), others not (e.g., Bremia lactucae).

What are opportunistic pathogens, and what are some examples?

- Opportunistic pathogens infect plants with weakened defenses.
- Examples include Pythium and Rhizoctonia causing seedling damping-off.

What are vascular wilts, and what are a couple of examples of fungi causing them?

- Vascular wilts are diseases causing xylem blockage and plant wilting.
- Fungi like Fusarium oxysporum and Verticillium dahliae cause these wilts.

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