Bulletin of Insectology (2006) 59, 105-109

Francesco Pavan, Pietro Zandigiacomo and Laura Dalla Montà (2006)
Influence of the grape-growing area on the phenology of Lobesia botrana second generation
Bulletin of Insectology 59 (2), 105-109
Abstract: A two-year study on the phenology of the European vine moth, Lobesia botrana (Denis et Schiffermüller) (Lepidoptera Tortricidae), was carried out in two vineyards (cv. Tocai friulano) in two different grape-growing areas of the Friuli Venezia Giulia region (north-eastern Italy). The areas are affected respectively by negligible (locality 1) and large (locality 2) larval population levels during the 3rd generation. In each vineyard the 2nd- and 3rd-male flights were recorded by pheromone traps and the phenology of 2nd-generation larvae was studied by sampling the clusters periodically. In locality 2, where the 3rd generation is more harmful, the 2nd and 3rd flights were earlier and the interval between the 50% of the two flights was about seven days shorter than that observed in the other locality. This fact was caused by a faster development of the 2nd-generation larvae. Locality 2 was warmer than locality 1, but in any case to cover the interval between the two flights L. botrana required more degree-days in the latter than in the former locality. Therefore, factors other than temperature need to be considered to explain the different length of larval development. An earlier 3rd-flight period enables the L. botrana females to lay eggs on still receptive berries and the 3rd-generation larvae to complete their development before the harvest. Therefore, this change in the 2nd-generation phenology appears crucial to explain the new occurrence of a harmful 3rd generation in some localities of north-eastern Italy.
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Database assignments for author(s): Francesco Pavan, Pietro Zandigiacomo

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
population dynamics/ epidemiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Lobesia botrana	Grapevine (Vitis)	Italy