PCR-RFLP and sequence analysis of a non-ribosomal fragment for genetic characterization of European stone fruit yellows phytoplasmas infecting various Prunus species

International audienc

Comparison of trapping methods to investigate leafhoppers as possible vectors of the phytoplasm causing apricot chlorotic leafroll in apricot orchards

National audienc

Les taches noires de l'abricot

2 illus. 1 tables 2 graph.National audienc

Comparison of apricot tree growth and development in 3 french growing areas

National audienc

National agreement for the evaluation of fruit tree cultivars and rootstocks

National audienc

PCR Assay for specific detection of European stone fruit yellows phytoplasmas and its use for epidemiological studies in France

International audienc

Comparison of apricot tree growth and development in three French growing areas

National audienceApricot cultivars are characterized by a specific geographic and climatic area and when they grow anywhere else, their production decrease drastically. Such a behavior was described as a consequence of high flower bud drop, numerous flower anomalies, irregularities in floral induction and differentiation. Some authors have also mentioned that tree morphology was affected by location. The present study was based on the assumption of a relationship between the vegetative growth and the flowering potential. Tree architecture was analyzed in different growing areas and growth patterns were compared. Four cultivars were studied (SEO, Orangered, Fantasme and Bergeron) grafted on the same rootstock (Manicot) in the three main apricot production areas in France: North Rhône valley (INRA Gotheron, Valence), South Rhône valley (INRA Melgueil, Montpellier) and Roussillon (SICA Centrex, Torreilles). Architectural descriptions were done yearly and annual shoots were described by the length of their different growth units and top/bottom diameters. In 2001, we focused in the spatial and seasonal distribution of the shoots that kept growing and in the shoot diameter increments. The first results pointed out differences in the organization of the annual shoot according to the geographic area. Primary and secondary growth rhythmicity were affected by the growing area as well as the balance between growing and resting shoots along the limb. The increase in vegetative growth associated with an earlier increase in diameter increments are discussed in terms of their involving in the decrease of the flowering potential in the case of unfruitfulnes

Apricot chlorotic leaf roll in Roussillon : I. specific detection and characterization of the pathogen and search for alternative host plants

International audienc

L'abricot. Quelles varietes pour demain

National audienc

Mapping the spread of apricot chlorotic leaf roll (ACLR) in southern France and implication of Cacopsylla pruni as a vector of European stone fruit yellows (ESFY) phytoplasmas

International audienc