Plant Disease Diagnosis Importance by Dr Dhanushka Udayanga

Play an AI-generated podcast conversation about this lesson

Which of the following is an advantage of molecular methods in plant disease detection?

Low sensitivity

Slow detection process

High specificity (correct)

Dependency on culturing before detection

What is the main method for dispersal of plant pathogenic bacteria?

Animals

Manure

Water (correct)

Air

Why do viruses require a living host in order to reproduce?

To ensure rapid dispersal

To use plant host cells in the reproduction process (correct)

To obtain nutrients from the host

To protect themselves from chemicals

What is the most challenging aspect of morphological identification of plant pathogens?

Presence of fruiting bodies and spores (D) Signup and view all the answers

What is a key characteristic of most plant pathogenic bacteria?

Production of spores (C) Signup and view all the answers

How do fungi primarily disperse as plant pathogens?

Through air (B) Signup and view all the answers

Why is disease diagnosis important in plant diseases?

To save existing plants and prevent disease recurrence (B) Signup and view all the answers

What is the primary purpose of detection in plant disease management?

Identifying signs or symptoms of disease (C) Signup and view all the answers

What is the main difference between detection and diagnosis in plant diseases?

Detection confirms the presence of disease, while diagnosis identifies the causal agent (C) Signup and view all the answers

Which of the following is NOT an impact of plant diseases on humans?

Increased availability of crops (D) Signup and view all the answers

What makes accurate diagnosis crucial in plant disease management?

It helps in implementing the most effective treatment strategy (B) Signup and view all the answers

Why is it important to prevent dissemination of plant diseases between countries?

To protect agriculture globally and avoid widespread crop damage (B) Signup and view all the answers

In plant disease diagnosis, which method has been used since the late 1970s?

Molecular methods (B) Signup and view all the answers

What is the purpose of the third name in trinomials used for some fungal and bacterial pathogens?

Designate the host (D) Signup and view all the answers

How are bacteria commonly identified based on biochemical features?

Fatty acid profiles (D) Signup and view all the answers

Which method was the first to be developed for the detection of viruses and viroids in plant diseases?

Dot-blot hybridization (A) Signup and view all the answers

What is the primary factor that subjective identification of pathogens depends on?

Environmental conditions (A) Signup and view all the answers

Which fungus caused the Bengal famine in India in 1943?

Bipolaris oryzae (D) Signup and view all the answers

What is one reason why early detection and accurate diagnosis of plant diseases is important?

To prevent disease outbreaks (D) Signup and view all the answers

What skills are required for a diagnostician in plant disease diagnosis?

Observation skills and detective abilities (B) Signup and view all the answers

Which of the following is NOT a traditional method in plant disease diagnosis?

Molecular Testing (A) Signup and view all the answers

What is a drawback of traditional plant disease diagnosis methods?

Time-consuming (B) Signup and view all the answers

Which of the following is an advantage of molecular methods in plant pathogen detection?

Quick results (A) Signup and view all the answers

Why are molecular methods preferred over traditional methods in plant pathogen detection?

They offer quick and accurate results (D) Signup and view all the answers

What is the main reason that molecular methods did not have a significant impact in routine diagnostic laboratories during the 1980s?

Absence of pure culture (D) Signup and view all the answers

Why is having a pure culture important in molecular identification?

To prevent contamination and ensure accurate results (A) Signup and view all the answers

What is the purpose of type material in molecular identification?

To standardize the naming of species (A) Signup and view all the answers

How have scientists documented the earth's plant and fungal diversity over the past three centuries?

Through dried reference specimens maintained in herbaria (B) Signup and view all the answers

Why must each species name have a physical representation permanently associated with it?

To ensure accuracy and avoid confusion in species identification (D) Signup and view all the answers

How many herbaria are estimated to exist in the world today?

Approximately 30,000 herbaria (D) Signup and view all the answers