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Acquisition and transmission of selected CTV isolates by Aphis gossypii
Orlando Campolo,Eleonora Chiera,Antonino Malacrinò,Francesca Laudani,Anna Fontana,Giuliana R. Albanese,Vincenzo Palmeri 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.3
Citrus tristeza virus (CTV) is a severe threat to the citrus industry. Disease symptoms and severity may varydepending on the CTV isolates. These are responsible for the decline of trees grafted on sour orange rootstock,or stem pitting on some citrus commercial cultivars regardless of rootstock. In the Calabria region (Italy), CTVwas first reported on cultivars imported from other countries. However, recent observations suggested thatnatural spread of CTV was occurring and a study was needed to determine the epidemiological status andaphid transmission of CTV in Calabria. The role played by local A. gossypii in the spread of CTV was analyzed inthe laboratory using various viral acquisition, inoculation periods with three different CTV isolates. Singleaphid vectors acquired CTV after a minimumof 30 min acquisition access period (AAP) and were able to transmitthe virus after a 60 min inoculation access period (IAP) to healthy plants. A minimumof four aphid vectorswereneeded to reach 50% transmission probability. The results suggested that the three tested strains are transmittedby A. gossypii in a semi-persistent mode. The results demonstrated that local A. gossypii population can acquireand transmit efficiently the tested virus isolates with serious implications on the virus spread.
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