37 Questions
Which virus disease is the most common in Southeast Asia among the virus diseases infecting rice?
Rice tungro disease
What is the estimated annual economic loss caused by the infection of rice with tungro viruses?
$1.5 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?
98%
What is the estimated yield loss caused by the rice yellow mottle virus (RYMV) in several African countries?
20-100%
What is the estimated annual yield loss caused by the rice dwarf virus (RDV) in Japan?
15,000 tons
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%
What was the average annual loss in barley crop in the United States due to BSMV and BYDV between 1951-1960?
4%
Which of the following is NOT a major virus disease affecting rice?
Rice blast virus
According to the passage, which factor does NOT influence the losses caused by virus diseases?
Fluctuating prices for crop products
Which virus caused an epidemic in Montana and Carlow, leading to grain yield reductions in spring barley?
Barley yellow dwarf virus (BYDV)
How much did MDMV infection cause in annual loss of corn in Ohio during 1962?
$500,000
What is the main staple food of half of the world's population, particularly in Asia and the Pacific Islands?
Rice
Which disease caused nearly every maize plant to be infected within 8 weeks of germination in Rhodesia?
Maize stripe virus (MSV)
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
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%
What is the primary focus of the passage?
The impact of plant virus diseases on economically important crops
Who reported that SCMV strains reduced maize yields in East Africa by 25% and in Kenyan hybrids?
Kulkarni
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
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
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)
In which region is rice the main staple food for half of the world's population?
Asia and the Pacific Islands
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
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
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
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%
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%
What is the estimated yield loss caused by rice yellow mottle virus (RYMV) in several African countries?
20%-100%
What is the estimated annual yield loss caused by the rice dwarf virus (RDV) in Japan?
15,000 tons of grain
What was the yield decrease due to BYDV infection recorded by Thackray et al. in Western Australia?
55-72 kg/ha
What percentage of yield losses were observed in barley crops in California due to a new outbreak of BYDV disease in 1951?
10%
Under what conditions did Kingsland (1980) report an average yield reduction of 62% due to MDMV infection?
100% disease incidence
In which country did Rose (1974) observe that plants infected at an early stage of growth produced no yield?
Rhodesia
What percentage of yield losses was reported by Guthrie (1978) due to MSV infection under field conditions?
25% to 60%
According to Beuve et al. (1999), what was the estimated yield loss of maize infected with the BYDV-PAV strain?
15% to 20%
What percentage of yield losses was indicated due to maize rayado fino virus in Central America?
40% to 50%
What percentage of crop losses was caused by Colombian stripe virus disease in cultivars ICA-V-504 in Colombia?
89% to 100%
What percentage of crop losses was reported due to maize chlorotic mottle virus in natural field infections of maize crops?
10% to 15%
Learn about the impact of plant viruses on agriculturally important crops, the increasing incidence of virus diseases, and strategies for managing these diseases. Explore the use of virus resistant crops and efficient management practices to mitigate the damage caused by plant viruses.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
