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Attractant for Vinegar Fly, Drosophila Busckii, and Cluster Fly, Pollenia

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Attractant for Vinegar Fly, Drosophila Busckii, and Cluster Fly, Pollenia Attractant for Vinegar Fly, Drosophila busckii, and Cluster Fly, Pollenia rudis (Diptera: Drosophilidae et Calliphoridae) Vincas Bu¯daa,*, Sandra Radžiute˙b, and Erikas Lutovinovasb a Vilnius University, Faculty of Natural Sciences, M. K. Cˇ iurlionio 21/27, LT-03101 Vilnius, Lithuania. Fax: +3 70 5 2 72 93 52. E-mail: [email protected] b Institute of Ecology, Vilnius University, Akademijos 2, LT-08412 Vilnius-21, Lithuania * Author for correspondence and reprint requests Z. Naturforsch. 64 c, 267 – 270 (2009); received September 4/October 24, 2008 A fi eld test carried out in an industrial greenhouse in Lithuania revealed the attractive- ness of synthetic methyl salicylate (MeSa) to two dipteran species: the vinegar fl y, Dro- sophila busckii (Drosophilidae), and the cluster fl y, Pollenia rudis (Calliphoridae). The at- tractant for the former fl y species was especially effective, as sticky traps containing 0.25 ml of MeSa captured (814 ± 55) D. busckii fl ies/trap on average compared to (12 ± 4) fl ies/trap in control traps. The mean capture of P. rudis [(42 ± 4) fl ies/trap] was signifi cantly higher in MeSa-baited traps compared to the control traps [(13 ± 4) fl ies/trap]. The presence of MeSa in emissions of many fruits suitable for D. busckii feeding allows to attribute this attractant to kairomones. In case of P. rudis, MeSa should be attributed to synomones (compounds benefi cial for both receiver and sender), because adult fl ies feeding on fl owers act as pol- linators. This is the fi rst report on the fi eld-active attractant for D. busckii and the second for P. rudis. Key words: Attractiveness, Field Trapping, Methyl Salicylate Introduction single species). Two of the chemicals in the three- component attractive blends are the same: ethanol Chemical attractants are a useful tool for insect and acetic acid, one component being different: monitoring. Therefore, extension of our knowl- either 2-phenylethanol or ethyl acetate (Casana- edge on both attractive compounds and species Giner et al., 1999; Zhu et al., 2003). responding to the chemicals is of great impor- Within the family Calliphoridae, which includes tance. more than 1000 species (Nartshuk, 2003), a phe- The order Diptera is among the species-richest romone of a single species was identifi ed and ones. It includes many species of economic im- attractants for only 8 species were revealed (El- portance, i.e. both useful insects (e.g., pollinators) Sayed, 2008). It should be noted that all 5 com- and pests (transmitters of human, animal and pounds known up to now as attractants for fruit plant diseases). However, chemical attractants fl ies (Drosophilidae) attract some species from are known for relatively few species in this order, the Calliphoridae family as well. Other attract- especially when compared to lepidopterans (El- ants include phenols (phenol, p-cresol), organic Sayed, 2008), thus dipterans remain to be investi- acids (butyric, valeric, benzoic), aliphatic alcohols gated much more thoroughly in this aspect. (2-methylpropan-1-ol, butan-2-ol, delta-1-octen- The Drosophilidae family is one of the best- 3-ol), hydrogen sulfi de compounds (1,2-dimeth- studied families within the order Diptera in dif- yldisulfane and 1,3-dimethyltrisulfane), an ester ferent aspects. About 3000 species are known in (sec-butyl acetate) and a ketone (propan-2-one) this family (e.g. Nartshuk, 2003). However, avail- (El-Sayed, 2008). able data on chemical attractants (including phe- Taking into consideration the richness of spe- romones) are scarce. Sex and/or aggregation phe- cies within the two dipteran families briefl y re- romones have been identifi ed for 34 species and viewed, one can conclude, that the knowledge of attractants for 12 species only (El-Sayed, 2008). attractant composition still remains poorly inves- The known attractants include methyl eugenol tigated. (attractive for fruit fl ies of 10 species) and two Many chemicals of plant origin are potential three-component blends (each attractive for a attractants for insects including methyl salicylate 0939 – 5075/2009/0300 – 0267 $ 06.00 © 2009 Verlag der Zeitschrift für Naturforschung, Tübingen · http://www.znaturforsch.com · D NNC_3_4_2009.indbC_3_4_2009.indb 267267 004.05.20094.05.2009 111:08:231:08:23 268 V. Bu¯da et al. · Attractant for Fly Species (MeSa). The aim of the present study was to test 166 P. rudis specimens were captured. In control the activity of MeSa for some species within the traps there were 46 and 51 fl ies of the two dip- order Diptera. teran species, respectively. The traps contained some other Diptera species as well, however, the Material and Methods catches were low and no signifi cant differences Behavioural test compared to the control were recorded. The behavioural test was conducted in a 0.5- Vinegar fl y, D. busckii Coquillett (Drosophilidae) ha greenhouse with green onions growing on ± compost-enriched ground substrate in Saka- The mean catch [(814 55) fl ies/trap] of lai, Šalcˇininkai district, Lithuania in September vinegar fl ies in MeSa-baited traps signifi cantly ± 2006. differed from that in control traps [(12 4) Sticky yellow cards [Biobest N.V., Westerlo, Bel- fl ies/trap], p = 0.02. The yellow colour itself at- gium (Bug Scan, 20 × 10 cm in size)] were used. tracted the fl ies as proved by catches in the In the central part of the card a 2-ml plastic vial control traps. However, the application of MeSa was fi xed in a hole which has been cut at a height enhanced the attractiveness of the traps signifi - of ~2 cm above the centre of the card. The vials cantly (Fig. 2). were plugged with cotton wool. Such sticky traps There is very little known on chemical com- were fi xed vertically to wire poles at a height of pounds affecting the D. busckii behaviour. Two ~2 m above the ground. They were either baited compounds [(S)-2-pentadecyl acetate and 2-pen- with 0.25 ml of MeSa (Fig. 1) (purity ≥99%; Carl tadecanone] are reported to trigger an aggrega- Roth GmbH, Karlsruhe, Germany) or unbaited tion reaction of the fl ies. These compounds were (control). The traps were placed randomly in extracted from the ejaculatory bulb of males of three rows with 15 m distance in between. Four this species and were attributed to aggregation replicates were conducted. The traps were collect- pheromones (Schaner et al., 1989). ed after a 14-d period, and trapped insects were D. busckii like most vinegar fl ies, is attracted identifi ed and counted. to various rotting vegetable materials (vegetables and fruit in particular), abundant in bacteria and Species identifi cation yeasts. When fl ying from one rotting object to another, adults transmit rot-causing microorgan- The trapped specimens were identifi ed follow- isms. Thus, although vinegar fl ies are sapropha- ing the key of Shtakelberg (1970) for Drosophili- gous, they can cause considerable damage by dae and Grunin (1970) for Calliphoridae. spreading the rot. It was demonstrated, that D. busckii transmits, to high extent, fruit rot caused Statistical analysis by the fungus Aspergillus niger thus non-insecti- Catches were analyzed by the Kruskal-Wallis cide measures are searched for the control of the ANOVA test by ranks using the software Statis- tica 5.0 (Sokal and Rohlf, 1995). Results and Discussion Numerous catches of the dipteran species were recorded in yellow sticky MeSa-baited traps in the greenhouse. A total of 3255 D. busckii and Fig. 2. Mean captures of D. busckii in yellow sticky traps baited with and without (control) methyl salicylate (MeSa). Values marked by different numbers of aster- Fig. 1. Chemical structure of methyl salicylate (MeSa). isks differ signifi cantly. NNC_3_4_2009.indbC_3_4_2009.indb 268268 004.05.20094.05.2009 111:08:231:08:23 V. Bu¯da et al. · Attractant for Fly Species 269 fl ies with the aim to reduce a spread of the rot (Saxena and Saxena, 1990). It was demonstrated that D. busckii can be a vector of the bacterium Erwinia carotovora subsp. carotovora (Boers, 1997, after van der Sommen et al., 2000) which induces soft rot in chicory. Therefore D. busckii is considered a pest in commercial plantations of chicory, and insecticides are used to control it. It is known that D. busckii colonizes rotting oranges later than other species of Drosophila, larvae of which feed on the same resources and Fig. 3. Mean captures of P. rudis in yellow sticky traps form a guild coexisting on the same food source baited with and without (control) methyl salicylate (Nunney, 1996). This means that vinegar fl ies of (MeSa). Values marked by different numbers of aster- this species are potentially more dangerous trans- isks differ signifi cantly. mitters of pathogenic microorganisms than other Drosophila species. As the lifespan of adults is quite long, they Based on data on the D. busckii behaviour, undoubtedly need some food. P. rudis has been one can conclude that the fl ies are likely to be at- often recorded on fl owers of Asclepias syriaca tracted to compounds released by bacteria, yeasts, trapped by pollinium (Frost, 1965). Also it is es- fungi or rotting plant substrate. It is known that tablished that P. rudis is an important pollinator MeSa is an important fl avour constituent of many of the Mediterranean weed Vincetoxicum nigrum fruits (e.g. Goff and Klee, 2006) and some plants (Asclepiadaceae) (Lumer and Yost, 1995). Flow- when they are damaged by bacteria or fungi (Car- ers of many plants emit MeSa as the common doza et al., 2002; Cardoza and Tumlinson, 2006). compound of fl oral scent (Knudsen et al., 2006). Thus, we assume that MeSa can be attributed to Since MeSa is a widespread fl owers’ compound, kairomone attractants for this species.
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