francesca laudani - Academia.edu (original) (raw)
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INDIAN AGRICULTURAL RESEARCH INSTITUTE, NEW DELHI, INDIA
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Papers by francesca laudani
Journal of Asia-Pacific Entomology, 2014
Citrus Tristeza Virus (CTV) is a severe threat to the citrus industry. Disease symptoms and sever... more Citrus Tristeza Virus (CTV) is a severe threat to the citrus industry. Disease symptoms and severity may vary accordingly to the CTV isolates. These are responsible of the decline of trees grafted on sour orange rootstock, or stem pitting on some citrus commercial cultivars regardless of rootstock. In Calabria region (Italy), CTV was first reported on cultivars imported from other countries. However, recent observations suggested that natural spread of CTV was occurring and a study was needed to determine the epidemiological status and aphid transmission of CTV in Calabria. The role played by local A. gossypii in the spread of CTV was analyzed in the laboratory using various viral acquisition, inoculation periods with three different CTV isolates. Single aphid vectors acquired CTV after a minimum of 30 minutes acquisition access period (AAP) and were able to transmit the virus after a 60 minutes inoculation access period (IAP) to healthy plants. A minimum of four aphid vectors were needed to reach 50% transmission probability. The results suggested that the three tested strains are transmitted by A. gossypii in a semi-persistent mode. The results demonstrated that local A. gossypii population can acquire and transmit efficiently the tested virus isolates with serious implications on the virus spread.
Journal of Asia-Pacific Entomology, 2014
Citrus Tristeza Virus (CTV) is a severe threat to the citrus industry. Disease symptoms and sever... more Citrus Tristeza Virus (CTV) is a severe threat to the citrus industry. Disease symptoms and severity may vary accordingly to the CTV isolates. These are responsible of the decline of trees grafted on sour orange rootstock, or stem pitting on some citrus commercial cultivars regardless of rootstock. In Calabria region (Italy), CTV was first reported on cultivars imported from other countries. However, recent observations suggested that natural spread of CTV was occurring and a study was needed to determine the epidemiological status and aphid transmission of CTV in Calabria. The role played by local A. gossypii in the spread of CTV was analyzed in the laboratory using various viral acquisition, inoculation periods with three different CTV isolates. Single aphid vectors acquired CTV after a minimum of 30 minutes acquisition access period (AAP) and were able to transmit the virus after a 60 minutes inoculation access period (IAP) to healthy plants. A minimum of four aphid vectors were needed to reach 50% transmission probability. The results suggested that the three tested strains are transmitted by A. gossypii in a semi-persistent mode. The results demonstrated that local A. gossypii population can acquire and transmit efficiently the tested virus isolates with serious implications on the virus spread.