Monitoring of Drosophila suzukii in Emilia-Romagna region (2012-2013)
Abstract: In Emilia-Romagna region Drosophila suzukii (Matsumura) was detected in 2011 on cherry. During 2012-2013 a monitoring of D. suzukii was extended to the whole region. The objective was to obtain information on the distribution and incidence of pest populations for the regional alert system and to investigate on biological and ethological aspects of the pest. A total of respectively 118 and 91 traps in 2012 and 2013 were installed throughout the region. The traps were applied mostly in cherry orchards but also on apricot, peach, strawberry, plum, berries, persimmon and grapevine plants. In order to improve the monitoring, a slightly different kind of trap and primer was used in 2013 than in 2012. A detailed description of the used traps is given. In general the monitoring began in the middle of April, until harvest of the late ripening varieties. The content of the traps was examined every week in laboratory to determine the number and the sex of the adults. D. suzukii was found all over the region and on all crops monitored, while damages on fruits were reported only for cherry. On average only a few adults of D. suzukii were caught per trap during the spring and summer in 2012. However no significant damage to the production was recorded throughout the region in 2012. In 2013 the catches increased progressively from late May to July. The first oviposition and damage on cherry fruits were detected in early June, while significant damage was recorded in the second decade of July. In both years a decline of adult presence was recorded in August and an increase occurred in autumn. In conclusion the data arising from the monitoring showed that the insect is widespread in the region, although in different levels depending on crops and environmental conditions.