Abstract
Since yellow Leaf Syndrome has been reported in Brazil in the early 1990s, it has become increasingly important worldwide. The disease has now been identified in many countries, and most recently Guadeloupe and Barbados. The characteristic symptom is the yellowing of the midrib on the lower surface of the lamina. The relationship between the causal organism and the disease is not well established but there is very strong evidence that a luteovirus is associated with disease. The disease is transmitted through diseased cuttings, and under controlled conditions it has been found that some aphids can transmit the disease. Surveys conducted in 1997 showed that 4% of 456 varieties in Guadeloupe showed symptoms and 16% of 1213 varieties showed symptoms is Barbados. In Barbados there was an increase in the number of varieties showing symptoms from 1996 to 1997 and first ratoon fields showed more symptoms than plant cane fields. Only 15% of the breeding population at the West Indies Central Sugar Cane Breeding Station in Barbados showed any symptoms. As most commercial varieties are resistant, (64%) the disease may not cause a major yield loss in the region. With the use of more resistant varieties and good husbandry, the disease importance should decrease.
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Claims 12
Claim · model-written summary
Yellow leaf syndrome has been identified in Guadeloupe and Barbados.
Not reportedDirection
Verbatim
e0“The disease has now been identified in many countries, and most recently Guadeloupe and Barbados.”
t0“sugarcane”
Claim · model-written summary
The characteristic symptom is yellowing of the midrib on the lower lamina surface.
Not reportedDirection
Verbatim
e0“The characteristic symptom is the yellowing of the midrib on the lower surface of the lamina.”
t0“sugarcane”
Claim · model-written summary
A luteovirus is strongly associated with yellow leaf disease, although causality is unresolved.
- Taxon
- sugarcanet0
- Interactor
- a luteoviruse0pathogen
- Outcome
- associated with diseasee0
- Qualifier
- not well establishede0
Not reportedDirection
Verbatim
e0“The relationship between the causal organism and the disease is not well established but there is very strong evidence that a luteovirus is associated with disease.”
t0“sugarcane”
Claim · model-written summary
Diseased cuttings transmit yellow leaf disease.
Not reportedDirection
Verbatim
e0“The disease is transmitted through diseased cuttings”
t0“sugarcane”
Claim · model-written summary
Some aphids transmitted yellow leaf disease under controlled conditions.
- Taxon
- sugarcanet0
- Interactor
- aphidsAphidomorphae0pest
- Outcome
- aphids can transmit the diseasee0
- Qualifier
- under controlled conditionse0
Not reportedDirection
Verbatim
e0“under controlled conditions it has been found that some aphids can transmit the disease.”
t0“sugarcane”
Claim · model-written summary
In Guadeloupe, 4% of 456 varieties showed yellow leaf symptoms in 1997.
- Taxon
- sugarcanet0
- Outcome
- varieties in Guadeloupe showed symptomse0
- Value
- 4%e0
- Qualifier
- 456 varietiese0
- Setting
- Guadeloupee0
Not reportedDirection
Verbatim
e0“Surveys conducted in 1997 showed that 4% of 456 varieties in Guadeloupe showed symptoms”
t0“sugarcane”
Claim · model-written summary
In Barbados, 16% of 1213 varieties showed yellow leaf symptoms in 1997.
- Taxon
- sugarcanet0
- Outcome
- varieties showed symptomse0
- Value
- 16%e0
- Qualifier
- 1213 varietiese0
- Setting
- Barbadose0
Not reportedDirection
Verbatim
e0“16% of 1213 varieties showed symptoms is Barbados”
t0“sugarcane”
Claim · model-written summary
The number of symptomatic varieties in Barbados increased from 1996 to 1997.
Verbatim
e0“In Barbados there was an increase in the number of varieties showing symptoms from 1996 to 1997”
t0“sugarcane”
Claim · model-written summary
First ratoon fields showed more symptoms than plant cane fields in Barbados.
Verbatim
e0“first ratoon fields showed more symptoms than plant cane fields”
e1“In Barbados there was an increase in the number of varieties showing symptoms from 1996 to 1997”
t0“sugarcane”
Claim · model-written summary
Only 15% of the breeding population in Barbados showed symptoms.
- Taxon
- sugarcanet0
- Outcome
- breeding population at the West Indies Central Sugar Cane Breeding Station in Barbados showed any symptomse0
- Value
- 15%e0
- Setting
- Barbadose0
Not reportedDirection
Verbatim
e0“Only 15% of the breeding population at the West Indies Central Sugar Cane Breeding Station in Barbados showed any symptoms.”
t0“sugarcane”
Claim · model-written summary
The authors report that 64% of commercial varieties are resistant.
Not reportedDirection
Verbatim
e0“As most commercial varieties are resistant, (64%)”
t0“sugarcane”
Claim · model-written summary
The authors expect resistant varieties and good husbandry to reduce disease importance.
Verbatim
e0“With the use of more resistant varieties and good husbandry, the disease importance should decrease.”
t0“sugarcane”