Study of spatial distribution of <em>Empoasca vitis</em> goethe (<em>Homoptera</em>, <em>Typhlocybidae</em>) and contribution for sampling. 1 - Distribution on vinestock
André Fos,
Lionel Delbac,
Patrice Lecharpentier,
Vincent Labergère,
Jacques P. Stöckel
Affiliations
André Fos
INRA, Unité de Recherches de Zoologie, Institut de la Vigne de Bordeaux, B.P. 81, 33883 Villenave d'Ornon cedex (France)
Lionel Delbac
INRA, ISVV, UMR1065 SAVE, Santé et Agroécologie du Vignoble, Villenave d’Ornon, France; Université de Bordeaux, UMR1065 SAVE, Santé et Agroécologie du Vignoble, Bordeaux Sciences Agro, Villenave d’Ornon, France
Patrice Lecharpentier
INRA, Unité de Recherches de Zoologie, Institut de la Vigne de Bordeaux, B.P. 81, 33883 Villenave d'Ornon cedex (France)
Vincent Labergère
INRA, Unité de Recherches de Zoologie, Institut de la Vigne de Bordeaux, B.P. 81, 33883 Villenave d'Ornon cedex (France)
Jacques P. Stöckel
INRA, Unité de Recherches de Zoologie, Institut de la Vigne de Bordeaux, B.P. 81, 33883 Villenave d'Ornon cedex (France)
The spatial distribution of the grape leafhopper on a vinestock was studied by enumerating larvae on an entire plant in a vineyard and completed by following the hatching of eggs on different leaflevels in the laboratory. The main results are : (1) The age of the leaf is determinant for egg laying. (2) The eggs are aranged according to a « false contagion » standard dispersion model induced by the environment. (3) The larvae are diluted in the vegetation during the season independently of the vine variety. (4) Leafs occupied which are in the vegetation are more representative during all the season. (5) The distribution of the larvae is similar in summer between the primary and the secondary boughs. This results allow us to recommend to sampling one leaf by the vinestock at the grape level troughout the whole season.
