Olive Disease and Pest Surveys in Dorrego Area, Buenos Aires, Argentina

摘要

Olive (Olea europaea L.) is grown in western Argentina, mainly in Catamarca, La Rioja, Mendoza; San Juan provinces. However, 50-year-old olive trees are being recovered in Dorrego area, south of Buenos Aires province; less than 10-year-old olive orchards have been established. Disease and pest surveys were conducted to know the olive health status in Dorrego area. In March 2008, olive knot symptom in leaves, branches, trunks predominated in old trees under recovering. Some young orchards planted close to old olive knot infected trees also showed the disease. High incidence; severity of Cercospora cladosporioides, Cycloconium oleaginum; sooty mold fungi were recorded in leaves of old trees but they were rare in young orchards. The sooty mold fungi were associated to the presence of high olive scale infestations. Phyllosticta panizzei on leaves was also rare. Vascular pathologies (Verticillium dahliae) were not observed. There was high incidence of deformed leaves in one young orchard. Snails on olive fruits of old orchards; leaves eaten by locusts were emerging situations.