Multiannual infestation patterns of grapevine plant inhabiting Scaphoideus titanus (Hemiptera: Cicadellidae) leafhoppers

• Published in: The Canadian Entomologist
• Main Authors: I.E. Rigamonti, V. Trivellone, M. Jermini, D. Fuog, J. Baumgartner
• Format: Article in Journal/Newspaper
• Language: English
• Published: Entomological Society of Canada 2014
• Subjects: multiannual infestation; phenology model; time-varying distributed delay; Settore AGR/11 - Entomologia Generale e Applicata; Arctique*
• Online Access: http://hdl.handle.net/2434/230322; https://doi.org/10.4039/tce.2013.51

The Nearctic leafhopper Scaphoideus titanus Ball (Hemiptera: Cicadellidae) was accidentally introduced in Europe, where it became the vector of the ‘Candidatus Phytoplasma vitis’ phytoplasma causing the ‘Flavescence dore ́e’ disease of grapevine plants. A time-varying distributed delay model, simulating the successive occurrences of egg hatching, nymph presence, and adult emergence, is extended here to represent multi-generation infestation patterns of grapevine plants inhabited by eggs, nymphs, and adults. The model extension includes intrinsic mortality, mortality caused by plant dormancy, and low temperatures, development of diapausing and postdiapausing eggs, fecundity rates, and adult longevity. Field observations and published data were used to estimate parameters. The model was validated with five years canopy infestation data from five vineyards not subjected to insecticide treatments and found to have satisfactory explicative and predictive qualities. The model output is most sensitive to a 10% variation in the upper threshold and in the shape parameters of the survivorship function and least sensitive to a 10% variation in the shape parameters of the development function and the survivorship level. Recommendations are made to take into account other factors than temperature and plant phenology and include a wider geographical area in further model development. La cicadelle ne ́arctique Scaphoideus titanus Ball (Hemiptera: Cicadellidae) a e ́te ́ introduite accidentellement en Europe dans les anne ́es ‘50, ou` elle est devenue le vecteur du ) Candidatus Phytoplasma vitis * responsable de la maladie de Flavescence dore ́e de la vigne. Un mode`le de de ́lai distribue ́ dans le temps (time-varying distributed delay model), simulant les e ́ve`nements successifs des e ́closions, de la pre ́sence des stades juve ́niles et de l’e ́mergence des adultes, a e ́te ́ e ́tendu pour repre ́senter les niveaux d’infestation multi-ge ́ne ́rationnels de la vigne colonise ́e par des œufs, des nymphes et des adultes. ...