20 Questions
What are two examples of plant viruses mentioned in the text that have historically caused disastrous effects on crops?
Curly top virus of sugar beets and swollen shoots of cacao
How does the text describe the available information on the economic consequences of plant-virus epidemics?
Qualitative rather than quantitative
Why may the effects of virus diseases on yield not always increase linearly with the duration of infection?
Older plants usually resist the infection better than younger ones
How many virus species that infect cultivated plants worldwide have been described according to the text?
More than 1000
Why are plant-virus diseases a major concern to farmers, researchers, and policymakers?
Because they cause enormous yield losses in agriculturally important crops
What are some examples of virus diseases that cause severe yield losses in different crops?
Examples include tobamovirus, tospoviruses, begomoviruses, cucumoviruses, ilarvirus, potyviruses, tungro virus, carlavirus, babuvirus, badnavirus, polerovirus, and allexivirus.
Why are young plants generally more vulnerable to virus infection?
Young plants are generally more vulnerable to virus infection because in case of early infection, they can suffer serious losses.
What are some examples of major virus diseases that have caused epidemics and heavy economic losses worldwide?
Examples include Citrus tristeza virus (CTV), cacao swollen shoot virus (CSSV), banana bunchy top virus (BBTV), papaya ringspot virus (PRSV), wheat streak virus, and many others.
Why are vegetatively propagated crops at a higher risk of severe virus infections?
Vegetatively propagated crops such as bananas, cassava, potatoes, citrus, grapevines, taro, sugarcane, and sweet potatoes are at a higher risk because they are severely infected with different groups of viruses, leading to significant yield losses.
What is the estimated worldwide annual financial impact of plant viruses in agriculture?
The yield losses due to plant viruses are estimated at more than US$30 billion annually.
Why has the economic impact of plant viruses on yield loss been little studied?
The effects of virus diseases on yield are difficult to quantify.
What does the text suggest about the relationship between duration of virus infection and yield loss?
Older plants usually resist virus infection better than younger plants.
What does the text say about the number of virus species that infect cultivated plants worldwide?
More than 1000 virus species that infect cultivated plants worldwide have been described.
What is the main reason why plant-virus diseases are a major concern to farmers, researchers, and policymakers according to the text?
They cause enormous yield losses in agriculturally important crops.
What two examples of plant viruses that have historically caused disastrous effects on crops are mentioned in the text?
Curly top virus of sugar beets and swollen shoots of cacao.
Which of the following factors does NOT contribute to the severity of virus disease in crops?
Use of virus-resistant transgenic varieties
Which of the following statements about the impact of plant viruses is NOT supported by the text?
Annual and perennial crops are equally affected by plant viruses.
Which of the following factors has NOT contributed to the spread of plant virus diseases?
Use of virus-resistant transgenic varieties
Which of the following statements about the economic impact of plant viruses is correct, according to the text?
The financial impact of plant viruses in agriculture is estimated to be more than $30 billion annually worldwide.
Based on the information provided in the text, which of the following statements about virus diseases in crops is correct?
Virus diseases are a concern for farmers, consumers, and manufacturers.
Test your knowledge on the economic impact of plant viruses causing yield loss, with a focus on viruses like curly top virus of sugar beets and swollen shoots of cacao. Explore the historical effects of these viruses on the sugar beet industry in the western United States.
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