Spread of <Emphasis Type="Italic">Sugarcane yellow leaf virus</Emphasis> in initially disease-free sugarcane is linked to rainfall and host resistance in the humid tropical environment of Guadeloupe |
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Authors: | Jean Heinrich Daugrois Carine Edon-Jock Sandrine Bonoto Jean Vaillant Philippe Rott |
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Institution: | 1.Département BIOS,UPR 75 Amélioration génétique d’espèces à multiplication végétative, CIRAD,Petit-Bourg,France;2.Département de Mathématiques et Informatique,UFR Sciences Exactes et Naturelles,Pointe-à-Pitre,France;3.CIRAD, UMR BGPI,Montpellier Cedex 5,France |
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Abstract: | Sugarcane yellow leaf virus, the causal agent of yellow leaf, is transmitted from plant to plant by aphids. Understanding and evaluating the epidemic
risks due to spread of yellow leaf by aphids is an important feature for sugarcane production. Four distinct sugarcane trials
were set up with disease-free plants to study the relationship between spread of yellow leaf, the vector dynamics and environmental
conditions that may favour yellow leaf epidemics. The study was performed by surveys of vector populations and determination
of plant infections. Sugarcane cultivar SP71-6163, highly susceptible to yellow leaf, was analyzed spatially at different
dates in all four trials and compared to commercial cultivars in two of the four trials. These surveys allowed us to identify
a correlation between the aphid dynamics in the field and yellow leaf progress. Additionally, a negative correlation was found
between rainfall during the first weeks after transferring sugarcane plants to the field and aphid dispersal within the field.
This later result revealed an impact of rainfall on aphid invasion and subsequent plant infection by SCYLV. If aphids are
the key factor for disease spread, plant response varied also according to cultivar resistance with high variation depending
on rain conditions. |
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