Details on the situation of several quarantine pests in Valle d’Aosta region (IT)
The EPPO Secretariat has extracted the following data from the 2002 Annual Report of the phytosanitary service of Valle d’Aosta region (IT).
Apple proliferation phytoplasma (EPPO A2 list)
The disease is widespread in Valle d’Aosta. In old orchards, disease incidence can reach 100%. A sanitation programme is being implemented. Trees are inspected for the presence of typical symptoms or tested when no symptoms are found in the orchard. Infected trees are destroyed and when more than 25% infection is observed the whole orchard is destroyed.
Ceratitis capitata (Diptera: Tephritidae - EPPO A2 list)
Populations were favoured by high temperatures in 2002 and C. capitata was trapped in relatively high numbers in some areas, but no losses were observed.
Clavibacter michiganensis subsp. sepedonicus and Ralstonia solanacearum (both on EPPO A2 list)
Numerous potato fields were inspected, neither of these bacteria was detected.
Erwinia amylovora (EPPO A2 list)
A monitoring programme has been set up since 1992. In 2002, the 50 permanent sites were inspected twice. E. amylovora was not found.
Globodera rostochiensis and G. pallida (both on the EPPO A2 list)
Potato cyst nematodes are widespread in Valle d’Aosta, all tested samples collected from 10 potato fields were found positive.
So far, only bois noir (stolbur phytoplasma) is present in Valle d’Aosta. Although, the insect vector Scaphoideus titanus was trapped in numerous places, Grapevine flavescence dorée phytoplasma (EPPO A2 list) has never been detected in vineyards.
Rhagoletis completa (Diptera: Tephritidae - formerly EPPO A1 list)
It was first found in 1991. Since then, it has caused very serious losses to walnut production in some parts of Valle d’Aosta.
Thaumetopoea pityocampa (Lepidoptera: Notodontidae - EU Annexes)
Some outbreaks were observed in forestry, mainly on Pinus nigra and to a lesser extent on P. sylvestris.
Rapport d’activité 2002. Service phytosanitaire de l’arboriculture fruitière et des cultures. Région autonome de la Vallée d’Aoste, 142 pp.