Plant Viruses and Crop Yield

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Which virus disease is the most common in Southeast Asia among the virus diseases infecting rice?

Rice dwarf virus (RDV)

Rice stripe virus (RSV)

Rice yellow mottle virus (RYMV)

Rice tungro disease (correct)

What is the estimated annual economic loss caused by the infection of rice with tungro viruses?

$2 billion

$1.5 billion (correct)

$500 million

$1 billion

What is the maximum yield reduction reported for the rice variety ADT-31 in Tamil Nadu, India due to a severe epidemic of rice tungro disease?

75%

98% (correct)

90%

50%

What is the estimated yield loss caused by the rice yellow mottle virus (RYMV) in several African countries?

20-100% Signup and view all the answers

What is the estimated annual yield loss caused by the rice dwarf virus (RDV) in Japan?

15,000 tons Signup and view all the answers

What is the average loss of wheat crops in the United States annually during 1951-1960 due to mixed infection of wheat streak mosaic virus (WSMV), barley yellow dwarf virus (BYDV), and soilborne wheat mosaic virus (SBWMV)?

2% Signup and view all the answers

What was the average annual loss in barley crop in the United States due to BSMV and BYDV between 1951-1960?

4% Signup and view all the answers

Which of the following is NOT a major virus disease affecting rice?

Rice blast virus Signup and view all the answers

According to the passage, which factor does NOT influence the losses caused by virus diseases?

Fluctuating prices for crop products Signup and view all the answers

Which virus caused an epidemic in Montana and Carlow, leading to grain yield reductions in spring barley?

Barley yellow dwarf virus (BYDV) Signup and view all the answers

How much did MDMV infection cause in annual loss of corn in Ohio during 1962?

$500,000 Signup and view all the answers

What is the main staple food of half of the world's population, particularly in Asia and the Pacific Islands?

Rice Signup and view all the answers

Which disease caused nearly every maize plant to be infected within 8 weeks of germination in Rhodesia?

Maize stripe virus (MSV) Signup and view all the answers

What is the main purpose of the chapter discussed in the passage?

To review the relevant literature available on crop losses caused by different plant virus diseases Signup and view all the answers

What percentage of yield reduction was observed in maize varieties Anjou 210, Austra 290, and Pioneer 131 due to BYDV infection in the United Kingdom?

15%-20% Signup and view all the answers

What is the primary focus of the passage?

The impact of plant virus diseases on economically important crops Signup and view all the answers

Who reported that SCMV strains reduced maize yields in East Africa by 25% and in Kenyan hybrids?

Kulkarni Signup and view all the answers

What are some integrated disease management approaches mentioned in the text to reduce losses caused by plant virus diseases?

Using virus resistant crops and efficient management of insect vectors and alternate susceptible hosts Signup and view all the answers

Which factors influence the losses caused by virus diseases according to the passage?

Factors like incidence of infection, severity of disease, duration of infection, and fluctuating prices for crop products Signup and view all the answers

What are some major virus diseases infecting rice as mentioned in the text?

Tungro disease, rice hoja blanca virus (RHBV), rice yellow mottle virus (RYMV), rice grassy stunt virus, and rice stripe virus (RSV) Signup and view all the answers

In which region is rice the main staple food for half of the world's population?

Asia and the Pacific Islands Signup and view all the answers

What are some crops discussed in the chapter regarding losses caused by different plant virus diseases?

Cereals, millets, legumes, vegetables, tuber crops, fruits, industrial crops, edible oil crops, and spice crops Signup and view all the answers

Why have little attempts been made to establish the final yield loss in quality and quantity of any crop due to virus infection?

Because losses caused by virus diseases depend on many factors and can vary based on different conditions Signup and view all the answers

What is the estimated annual economic loss caused by rice tungro disease due to the infection of rice with tungro viruses?

$1.5 billion dollars Signup and view all the answers

What is the maximum yield reduction reported for the rice variety ADT-31 in Tamil Nadu, India due to a severe epidemic of rice tungro disease?

98% Signup and view all the answers

What is the average annual loss in barley crop in the United States due to mixed infection of wheat streak mosaic virus (WSMV), barley yellow dwarf virus (BYDV), and soilborne wheat mosaic virus (SBWMV) between 1951-1960?

2% Signup and view all the answers

What is the estimated yield loss caused by rice yellow mottle virus (RYMV) in several African countries?

20%-100% Signup and view all the answers

What is the estimated annual yield loss caused by the rice dwarf virus (RDV) in Japan?

15,000 tons of grain Signup and view all the answers

What was the yield decrease due to BYDV infection recorded by Thackray et al. in Western Australia?

55-72 kg/ha Signup and view all the answers

What percentage of yield losses were observed in barley crops in California due to a new outbreak of BYDV disease in 1951?

10% Signup and view all the answers

Under what conditions did Kingsland (1980) report an average yield reduction of 62% due to MDMV infection?

100% disease incidence Signup and view all the answers

In which country did Rose (1974) observe that plants infected at an early stage of growth produced no yield?

Rhodesia Signup and view all the answers

What percentage of yield losses was reported by Guthrie (1978) due to MSV infection under field conditions?

25% to 60% Signup and view all the answers

According to Beuve et al. (1999), what was the estimated yield loss of maize infected with the BYDV-PAV strain?

15% to 20% Signup and view all the answers

What percentage of yield losses was indicated due to maize rayado fino virus in Central America?

40% to 50% Signup and view all the answers

What percentage of crop losses was caused by Colombian stripe virus disease in cultivars ICA-V-504 in Colombia?

89% to 100% Signup and view all the answers

What percentage of crop losses was reported due to maize chlorotic mottle virus in natural field infections of maize crops?

10% to 15% Signup and view all the answers

Plant Viruses and Crop Yield

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Questions and Answers

Which virus disease is the most common in Southeast Asia among the virus diseases infecting rice?

What is the estimated annual economic loss caused by the infection of rice with tungro viruses?

What is the maximum yield reduction reported for the rice variety ADT-31 in Tamil Nadu, India due to a severe epidemic of rice tungro disease?

What is the estimated yield loss caused by the rice yellow mottle virus (RYMV) in several African countries?

What is the estimated annual yield loss caused by the rice dwarf virus (RDV) in Japan?

What is the average loss of wheat crops in the United States annually during 1951-1960 due to mixed infection of wheat streak mosaic virus (WSMV), barley yellow dwarf virus (BYDV), and soilborne wheat mosaic virus (SBWMV)?

What was the average annual loss in barley crop in the United States due to BSMV and BYDV between 1951-1960?

Which of the following is NOT a major virus disease affecting rice?

According to the passage, which factor does NOT influence the losses caused by virus diseases?

Which virus caused an epidemic in Montana and Carlow, leading to grain yield reductions in spring barley?

How much did MDMV infection cause in annual loss of corn in Ohio during 1962?

What is the main staple food of half of the world's population, particularly in Asia and the Pacific Islands?

Which disease caused nearly every maize plant to be infected within 8 weeks of germination in Rhodesia?

What is the main purpose of the chapter discussed in the passage?

What percentage of yield reduction was observed in maize varieties Anjou 210, Austra 290, and Pioneer 131 due to BYDV infection in the United Kingdom?

What is the primary focus of the passage?

Who reported that SCMV strains reduced maize yields in East Africa by 25% and in Kenyan hybrids?

What are some integrated disease management approaches mentioned in the text to reduce losses caused by plant virus diseases?

Which factors influence the losses caused by virus diseases according to the passage?

What are some major virus diseases infecting rice as mentioned in the text?

In which region is rice the main staple food for half of the world's population?

What are some crops discussed in the chapter regarding losses caused by different plant virus diseases?

Why have little attempts been made to establish the final yield loss in quality and quantity of any crop due to virus infection?

What is the estimated annual economic loss caused by rice tungro disease due to the infection of rice with tungro viruses?

What is the maximum yield reduction reported for the rice variety ADT-31 in Tamil Nadu, India due to a severe epidemic of rice tungro disease?

What is the average annual loss in barley crop in the United States due to mixed infection of wheat streak mosaic virus (WSMV), barley yellow dwarf virus (BYDV), and soilborne wheat mosaic virus (SBWMV) between 1951-1960?

What is the estimated yield loss caused by rice yellow mottle virus (RYMV) in several African countries?

What is the estimated annual yield loss caused by the rice dwarf virus (RDV) in Japan?

What was the yield decrease due to BYDV infection recorded by Thackray et al. in Western Australia?

What percentage of yield losses were observed in barley crops in California due to a new outbreak of BYDV disease in 1951?

Under what conditions did Kingsland (1980) report an average yield reduction of 62% due to MDMV infection?

In which country did Rose (1974) observe that plants infected at an early stage of growth produced no yield?

What percentage of yield losses was reported by Guthrie (1978) due to MSV infection under field conditions?

According to Beuve et al. (1999), what was the estimated yield loss of maize infected with the BYDV-PAV strain?

What percentage of yield losses was indicated due to maize rayado fino virus in Central America?

What percentage of crop losses was caused by Colombian stripe virus disease in cultivars ICA-V-504 in Colombia?

What percentage of crop losses was reported due to maize chlorotic mottle virus in natural field infections of maize crops?

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