Bulletin OEPP/EPPO Bulletin (2015) 45 (2), 214–217 ISSN 0250-8052. DOI: 10.1111/epp.12205

Spread of the spotted wing drosophila – Drosophila suzukii (Diptera, Drosophlidae) and new distribution records in Dalmatia region of

M. Bjelis1, I. Buljubasi c1, L. Popovic1 and T. Masten Milek2 1Croatian Centre for Agriculture, Food and Rural Affairs, Institute for Plant Protection, Zvonimirova 14 a, 21210 , Croatia; e-mail: [email protected] 2Croatian Centre for Agriculture, Food and Rural Affairs, Institute for Plant Protection, Rim 98, 10000 , Croatia

A specific survey for the detection of Drosophila suzukii Matsmura 1931 (Diptera, Droso- philidae) in Dalmatia region of the Republic of Croatia during 2013, confirmed that the pest is present and widespread. Adults were detected in traps suspended in Prunus cerasus L. (sour cherry), Prunus persica L. (peach), Ficus carica L. (fig) and Morus alba L. (mulberry) orchards and individual trees, during the fruit maturation period, in 16 (of the 51 locations) where traps were placed in Dubrovacko–neretvanska, Splitsko–dalmatinska, Sibensko – kninska and Zadarska counties. This confirmed the rapid spread of D. suzukii in Croatia and this pest is a great concern for areas that are not yet infested that have favourable conditions for the pests’ development. The results of the survey highlight the importance of the devel- opment and implementation of long-term sustainable control.

jak et al., 2011). In 2011 and 2012, the pest was detected Introduction in 5 counties and fruit infestations were recorded mainly in Drosophila suzukii Matsmura 1931 (Diptera, Drosophili- Istarska and Primorsko - goranska counties (Masten Milek dae), the spotted wing drosophila, is a pest of South East et al., 2013). In Dalmatia region the pest was detected in Asian origin which is well established in Europe today. It Splitsko-dalmatinska county in municipality of Vrgorac in is considered that D. suzukii was detected in EPPO region single orchard as adults in traps placed in Prunus persica relatively late due to wrongly assigning the damages L. (peach) orchards (Masten Milek et al., 2011). During recorded on fruit to Drosophila melanogaster Meigen 1930 specific survey programs in Croatia since the first detection, (Diptera, Drosophilidae) (EPPO, 2010). In Europe this pest D. suzukii was detected on different cultivated and horticul- was reported for the first time in late 2008 in Spain (Cala- tural hosts in orchards and urban areas, as adults captured bria et al., 2012) and Italy during 2009 (Grassi et al., 2009; in traps and larvae in fruits. Adults of D. suzukii were Grassi et al., 2012; Calabria et al., 2012). During a period detected in traps placed in plants of P. persica L. (peach), of only 2 years from 2010 to 2011, D. suzukii invaded a Prunus avium L. (sweet cherry), Prunus cerasus L. (sour much wider area in Europe, causing damage to fruit pro- cherry), Ficus carica L. (fig), Prunus domestica L. (plum), duction. The pest was detected in France (Weydert & V. vinifera L. (grapevine), Rubis idaeus L. (raspberry) and Bourgouin, 2011), Austria (Lethmayer, 2011), Switzerland Aronia melanocarpa Michaud (chokeberry) (Masten Milek (Baroffio & Fischer, 2011), Slovenia (Seljak, 2011), Croatia et al., 2013; Pavunic Miljanovic et al., 2014). Infestation (Masten Milek et al., 2011), Germany (Vogt et al., 2012) by D. suzukii larvae was confirmed in V. vinifera (vine) and Belgium (Cini et al., 2012). During autumn 2014, local cultivar Teran, F. carica (fig), Rubus fruticosus L. D. suzukii was detected in the Czech Republic and Slovak (blackberry) and Sorbus domestica L. (rowan) (Pavunic Republic (EPPO, 2014a,b). In a very short time, D. suzukii Miljanovic et al., 2014). Recent findings along the territory has been reported to have rapidly spread in the Mediterra- of Croatia and the high dispersal potential of the pest could nean region causing significant economic damage to fruit lead to the rapid spread in the currently non-infested coastal from a large number of hosts from different botanical fami- areas of Croatia, especially in Dalmatia region where large lies (Seljak, 2011; Calabria et al., 2012; Cini et al., 2012). numbers of potential hosts, both wild and cultivated, are It is reported that D. suzukii is able to infest and reproduce growing. in wide range of cultivated and wild hosts with preference Following the information from other neighboring coun- for soft skinned fruit including grapes (Vitis vinifera L.) tries about the rapid expansion of the D. suzukii over large (Seljak, 2011; Cini et al., 2012). Prior to the present sur- areas and recorded damages, the area of Dalmatia region is vey, D. suzukii was detected in Croatia in 2010 in the west rated as potentially highly threatened by the invasion of this part of the Istra peninsula (Masten Milek et al., 2011; Sel- pest. Taking into account the agro-ecological characteristics

214 ª 2015 The Authors. Journal compilation ª 2015 OEPP/EPPO, EPPO Bulletin 45, 214–217 Spotted wing drosophila in Dalmatia 215 of the area of Dalmatia, where traditional Mediterranean Novi, Kastel Luksic, Solin, Split, , Vinisce, Mar- cultivated plants, which are known to be D. suzukii hosts, ina, Svinca, , , Skrip, Novo selo, Bol, Vrbanj, are found required further and more detailed examination to Kotrolovac, Dolcic; Sibensko – kninska County: Zaton, determine the possible presence and spread. Grabovci, Turanj, Tribunj, Primosten, Brodarica, Gre- bastica, Pirovac and Zadarska County: Benkovac, Skabrnja, Zemunik donji, Zemunik donji, Sopot, Sukosan and Molat. Materials and methods

Trapping materials and protocol Identification To detect D. suzukii adults, the most common tool used Processing and identification of collected samples was were traps made from plastic bottles baited with apple vine- made using a binocular Olympus SZX7 stereo microscope. gar (Walsh et al., 2011; Landolt et al., 2012). 500 mL plas- Identification was carried out on the basis of morphological tic bottles with 4 symmetrical lateral holes (diameter characteristics of males and females using relevant identifi- between 5–10 mm) located 5 cm below the top of the bot- cation keys (Markov & O’Grady, 2006; Vlach, 2010). tle were filled with 150–200 mL of commercial apple vine- gar (Opeco d.o.o.). Traps were put into place during the Results maturation period of the sour cherry, peach, fig and mul- berry fruits. Traps were suspended on the trees in the shade Summarized data from the detection survey and distribution of the canopy inside orchards, backyards or individual trees. of D. suzukii during 2013 are shown in Table 1 and Fig. 1. Approximately 7–10 days after putting the traps into place, During the survey, D. suzukii was found in a total of 16 they were replaced with new ones (Baker et al., 2010) and locations within 15 municipalities or towns, 6 out of total 8 the old traps were transferred to the laboratory for the sepa- monitored in Dubrovacko – neretvanska county, 6 out of ration of captured insects and identification of the total 28 monitored in Splitsko – dalmatinska County, 1 out D. suzukii specimens. of total 8 monitored in Sibensko – kninska County and 3 out of total 7 monitored in Zadarska County. These results from 2013 show that in comparison to 2010, when it was Locations detected in only one location in the region of Dalmatia, the Detection by trapping was conducted from June to Septem- pest quickly spread and was detected at a number of loca- ber 2013 in 51 locations in Dubrovacko – neretvanska tions. Captures of D. suzukii have been recorded in traps County: Hodilje, Ston, Orasac, Brsecine, Bacina, Kobiljaca, that were placed in orchards or on individual sour cherry Opuzen, Metkovic; Splitsko – dalmatinska County: Zrnov- trees from the late spring, starting in mid-June till mid-July. nica, Srinjine, Zvecanje, Tugare, Gata, Umcani, Drazevitici, These dates coincide with the ripening period of sour cher- Mimice, Krvavica, Drvenik, Podgora, Kastel Stari, Kastel ries (P. cerasus) and presence of fruits. The highest cap-

Table 1 Locations with detection of Drosophila suzukii adults using apple vinegar traps in Dalmatia during 2013.

Locations as marked Municipality/ Total County on the map Town Locality captures

Dubrovacko - neretvanska 1 Dubrovnik Zaton 1♂1♀(SC) 1 Dubrovnik Orasac 4♂3♀(F) 2 Dubrovacko Doli 0♂2♀(F) primorje 3 Ston Hodilje 0♂2♀(F) 4 Opuzen Opuzen 4♂0♀(SC); 2♂3♀(F) 5 Metkovic Metkovic9♂3♀(SC); 15♂16♀(F) Splitsko - dalmatinska 6 Gradac Drvenik 0♂1♀(F) 7 Vrgorac Drazevitici 2♂1♀(SC); 3♂1♀(MB) 8 Omis Gata 0♂1♀(SC) 9 Selca Povlja 0♂1♀(SC) 10 Solin Solin 0♂10♀(SC); 15♂8♀(F) 11 Kastela Kastel Stari 1♂0♀(SC) Sibensko - kninska 12 Sibenik Zaton 0♂1♀(P) Zadarska 13 Skabrnja Skabrnja 2♂1♀(P) 14 Posedarje Bastica 3♂1♀(P) 15 Zadar Brgulje 2♂3♀(P)

SC, sour cherry; F, fig; P, peach; MB, mulberry.

ª 2015 The Authors. Journal compilation ª 2015 OEPP/EPPO, EPPO Bulletin 45, 214–217 216 M. Bjelis et al.

individual trees of sour cherry (P. cerasus L.), peach (P. persica L.), fig (F. carica L.) and mulberry (M. alba L.), the pest was detected at only one location in munici- pality of Vrgorac, in Splitsko - dalmatinska County, as adult flies in traps that were suspended on sour cherry (P. cerasus L.) and mulberry (M. alba L.). In Dubrovacko - neretvanska and Splitsko – dalmatinska counties, D. suzukii was detected in plantations of sour cherries (P. cerasus L.) although Maraska which is the local variety of sour cherry (P. cerasus L.) is widespread in the whole area of Dalma- tia. This finding represents a risk of potential spread of this pest in other parts of Dalmatia region especially in Za- darska county where Maraska is a traditional fruit crop, grown both for commercial production purpose and in Fig. 1 Map showing municipalities with detection of Drosophila suzukii in Dalmatia during 2013. Dark areas are the sites where the backyards. During an earlier specific survey from 2010 to positive samples were found. Legend: Municipalities and towns by 2012 to detect D. suzukii, this pest was detected in only one counties affiliation: Dubrovacko – neretvanska County: 1 – Dubrovnik, locality of Vrgorac municipality inside regione of Dalmatia 2 – Dubrovacko primorje, 3 – Ston, 4 – Opuzen, 5 – Metkovic; (Masten Milek et al., 2011). The latest results of the detec- Splitsko – dalmatinska County: 6 – Gradac, 7 – Vrgorac, 8 – Omis, tion surveillance that was conducted during 2013 in the – – – – – 9 Selca, 10 Solin, 11 Kastela; Sibensko kninska County : 12 region of Dalmatia show that the pest was detected in over Sibenik; Zadarska County: 13 – Skabrnja, 14 – Posedarje, 15 – Zadar. 29 % of the locations where detection traps were set. The spatial distribution of D. suzukii during 2013 in Dalmatia suggests that rapid spread of this pest could be due to human tures of the pest during this period were recorded at the influenced factors such as transportation or trade of fresh locations by the town of Metkovic and Opuzen in Dubr- fruits that are hosts of D. suzukii. This theory is supported by ovacko – neretvanska County and Solin in Splitsko - dal- the detection of pests on individual trees adjacent to or near matinska County. During the summer season, D. suzukii small shops and restaurants in tourist centres away from agri- was detected in orchards and individual trees of P. persica cultural production (Zaton and Doli in Dubrovacko - neret- (peach) or F. carica (fig) which confirms earlier findings in vanska, Drvenik in Splitsko – Dalmatinska and Brgulje in Croatia (Masten Milek et al., 2013; Pavunic Miljanovic Zadarska counties). The fact that D. suzukii was detected in et al., 2014). As expected, at the locations Metkovic, Solin a large number of sites in different environmental and urban and Opuzen which had the highest captures during the conditions, indicates the need for a more comprehensive spring season in traps placed in sour cherries (P. cerasus), approach that would allow the implementation of a system- D. suzukii was again caught during summer in traps placed atic monitoring programme and implementation of environ- in figs (F. carica) with even a higher number of adults cap- ment-friendly control measures in future. tured (Table 1). During 2013, a total of 122 adults of D. suzukii were Conclusions caught, of which 71 adult (36 males and 35 females) were captured in figs (F. carica L.), 34 adults (17 males and 17 Based on the results of this specific survey to detect and females), were captured in sour cherries (P. cerasus L.), 13 study the distribution of D. suzukii in Dalmatia region, it adults (7 males and 6 females) were captured on peaches can be concluded that in this part of Croatia D. suzukii is (P. persica L.) and 4 adults (3 males and 1 female) were present and widespread, as the pest was found in all captured on mulberry (M. alba L.). inspected counties in Dalmatia (i.e. on the coastal area, inland and on two islands). Adults of D. suzukii are present throughout the spring and summer season in orchards and Discussion individual host trees. The rapid spread of this invasive fruit The presence of D. suzukii in Dalmatia was confirmed in pest poses a challenge and raises the need for research on sites with different environmental conditions, on the Dalma- pest biology, ecology and host preference in order to tian coastal area, Dalmatian inland and on two islands: Brac develop and implement a long-term IPM program based on island (locality Povlja, Selca municipality, Splitsko - dalma- environmentally friendly and sustainable control. tinska County) and Molat island (locality Brgulje, town of Zadar, Zadarska County) (Fig. 1). Surprisingly, following Acknowledgements the result of detection in Vrgorac municipality in Splitsko – dalmatinska county in 2010, the pest has not spread in this This study was a part of annual survey program Drosophila area over a period of two growing seasons since the first suzukii Matsmura 1931 (Diptera, Drosophilidae), the spot- finding. Although traps were placed in several orchards or ted wing drosophila that was conducted by Mediterranean

ª 2015 The Authors. Journal compilation ª 2015 OEPP/EPPO, EPPO Bulletin 45, 214–217 Spotted wing drosophila in Dalmatia 217

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ª 2015 The Authors. Journal compilation ª 2015 OEPP/EPPO, EPPO Bulletin 45, 214–217