Amblyseius andersoni

Amblyseius andersoni (Chant) Typhlodromus andersoni Chant 1957: 296. Typhlodromus (Amblyseius) andersoni, Chant 1959: 92. Amblyseius (Amblyseius) andersoni, Muma 1961: 287. Typhlodromus (Typhlodromus) andersoni, Westerboer & Bernhard 1963: 682-689. Amblyseius (Multiseius) andersoni, Denmark & Muma 1989: 84. Amblyseius andersoni, Athias-Henriot 1958 b: 33; Moraes et al. 2004: 14; Chant & McMurtry 2004a: 199; 2007: 75. Amblyseiopsis potentillae Garman 1958: 7 (synonymy according to Chant & Yoshida-Shaul 1990). Amblyseius charui Gupta (synonymy according to Gupta 1985). Amblyseius reflexus Knisley & Denmark 1978: 8-10 (synonymy according to Chant & Yoshida-Shaul 1990). Typhlodromus (Amblyseius) britannicus Chant 1959: 87-88 (synonymy according to Chant & Yoshida-Shaul 1990). This species belongs to the obtusus species group with presence of setae J2 and Z1, seta Sources of measurements – Ukraine: Kolodochka & Bodarenko (1993); -: not provided. Sources of measurements for ♀♀ & ♂♂ – China (cited as Amblyseius magnus Wu, junior synonym of T. volgini according to Ryu & Ehara 1991): Wu (1987); Russia: Wainstein & Beglyarov (1971); South Korea: Ryu & Ehara (1991); -: not provided. Z4 short not as long as 2/3 between its base and that of seta s4, female ventrianal shield not vase-shaped/divided into separate ventral and anal shield and not wider at the level of anus than at the level of setae ZV2. It belongs to the andersoni species subgroup of this species group having calyx cup-shaped. This species is distributed worldwide but is mainly reported from Europe. It has been observed on cultivated plants in orchards (apple, peach, pear and citrus) and vineyards, particularly in humid areas (Chant & Hansell 1971; Papadoulis & Emmanouel 1991; Ivancich-Gambaro 1994; Papaioannou-Souliotis et al. 1994; Nicotina 1996; Duso & Pasini 2003; Ragusa 2006). Several studies focused on the biology of A. andersoni and on its ability to feed on plant pests. It is reported to feed on P. ulmi, Frankliniella occidentalis (Pergande) and Aculops lycopersici (Massee) (Koveos & Broufas 2000; Fischer and Mourrut-Salesse 2005; Houten et al. 2005; Lorenzon et al. 2012). This species was already known from Slovenia. With 204 specimens collected in total (see above) in 23 locations, it was one of the most abundant and more widespread species reported in this survey. It has been observed in various locations, probably because of the high relative humidity in these regions. Amblyseius andersoni was already mentioned from the Slovenian fauna (Miklavc 2006; Bohinc and Trdan 2013; Bohinc et al. 2018). World distribution: Algeria, Austria, Azerbaijan, Canada, Cyprus, Czechoslovakia, Czech Republic, Denmark, England, France, Georgia, Germany, Greece, Hungary, Italy, Japan, Latvia, Moldova, Morocco, Netherlands, Poland, Portugal, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Syria, Turkey, Ukraine, USA. Specimens examined: 135 ♀♀, 33 ♂♂ and 36 immatures in total. Straža pri Raki (aasl 240 m, lat. 45°55’28”N, long. 15°24’26”E), 3 ♀♀ on Acer pseudoplatanus L. (Aceraceae), 1 immature on Capsicum annuum L. (Solanaceae), 2 ♀♀ on Vitis vinifera L. (Vitaceae), 21 ♀♀ and 5 ♂♂ on Cucumis sativus L. (Cucurbitaceae) and 1 immature on Diospyros kaki Thunberg (Ebenaceae), 19/ VI /2018; Ravni (aasl 300 m, lat. 45°56’44”N, long. 15°24’21”E), 1 ♀ on Prunus cerasus L. (Rosaceae), 19/VI/2018; Arnovo Selo (aasl 192 m, lat. 47°58’07”N, long. 15°33’49”E), 7 ♀♀, 1 ♂, and 2 immatures on Malus domestica Miller (Rosaceae), 1 ♀ on Rubus fruticosus L. and 2 ♀♀ on P. cerasus, and 14 ♀♀, 1 ♂ and 2 immatures on Tilia cordata Miller (Malvaceae), 19/VI/2018; Ljubljana, Hotel Azur (aasl 296 m, 46°02’42”N, 14°28’25”E), 1 ♀ on M. domestica, 19/VI/2018 and 8 ♀♀ and 1 immature on Bambusa vulgaris Schrader (Poaceae), 21/VI/2018; Bukovica (aasl 49 m, lat. 45°54’06”N, long. 13°39’30”E), 11 ♀♀, 5 ♂♂ and 3 immatures on P. cerasus and 1 ♀ on Ficus carica L. (Moraceae), 20/VI/2018; Bilje (aasl 72 m, lat. 45°53’60”N, long. 13°38’41”E), 2 ♀♀ on V. vinifera, 20/VI/2018; Prvačina (aasl 47 m, lat. 45°53’22”N, long. 13°42’54”E), 2 ♀♀ on Prunus persica L. (Rosaceae), 1 ♀ and 1 immature on M. domestica, and 4 ♀♀, 1 ♂ and 2 immatures on Prunus pumila L. (Rosaceae), 20/VI/2018; Izola-Pivol (aasl 30 m, lat. 45°32’27”N, long. 13°40’51”E), 1 ♀ and 1 immature on Pyrus communis L. (Rosaceae) and 1 ♂ on Juglans regia L. (Juglandacae), 21/ VI /2018; Parecag (aasl 72 m, lat. 45°28’44”N, long. 13°37’49”E), 1 ♀ on Prunus domestica L. (Rosaceae), 21/VI/2018; Maribor, Plant Protection Institute (aasl 267 m, lat. 46°34’07”N, long. 15°38’12”E), 4 ♀♀ on M. domestica and 4 ♀♀, 2 ♂♂ and 2 immatures on P. persica, and 2 ♀♀ on V. vinifera, 22/VI/2018; Bukovska vas (aasl 370 m, lat. 46°32’57”N, long. 15°03’01”E), 1 ♀ and 1 ♂ on Fragaria sp. (Rosaceae), 12/VII/2018; Škofljica, Gumnišče 15 (aasl 305 m, lat. 45°58’15”N, long. 14°34’17”E), 1 ♀ and 1 ♂ on Acer campestre L. (Aceraceae), 18/VI/2019; Ljubljana, Biotechnical Faculty (aasl 307 m, 46°02’54”N, 14°28’32”E), 1 ♂ on Cornus mas L. (Cornaceae), 18/VI/2019; Ljubljana, Hotel Katrca (aasl 307 m, 46°3’19”N, 14°20’26”E), 1 ♀ on Carpinus betulus L. (Betulaceae), 18/ VI /2019, and 1 ♀ on Tilia platyphyllos Scopoli (Malvaceae), 22/ VI /2019; Sečovlje, 58a (aasl 3 m, lat. 45°28’43”N, long. 13°37’28”E), 2 ♀♀ on J. regia and on Cornus sanguinea L. (Cornaceae), 19/ VI /2019; Dragonja (aasl 3 m, lat. 45°27’32”N, long. 13°39’04”E), 3 ♀♀ on V. vinifera, 2 ♀♀ and 1 immature on P. pumila, and 1 ♂ on F. carica, 19/ VI /2019; Bertoki (aasl 28 m, lat. 45°32’55”N, long. 13°47’13”E), 1 ♀ on Actinidia deliciosa (A. Chevalier) C.F. Liang & A.R. Ferguson (Actinidiaceae), 19/ VI /2019; Pragersko, Kvedrova ulica (aasl 250 m, 46°23’48”N, 13°40’11”E), 2 ♀♀ and 1 ♂ on Pinus strobus L. and 2 ♀♀ and 1 ♂ on P. sylvestris L. (Pinaceae), 20/ VI /2019; Juršinci, Gabrnik 55 (aasl 301 m, lat. 46°28’43”N, long. 15°58’2”E), 1 ♀ and 1 immature on Rubus tomentosus Borkhausen (Rosaceae), 20/VI/2019; Veržej, Near the football stadium (aasl 182 m, lat. 46°35’27”N, long. 16°10’1”E), 2 ♀♀, 1 ♂ and 1 immature on Ulmus minor Miller (Ulmaceae) and 2 ♀♀ on Quercus robur L. (Fagaceae), 20/VI/2019; Šobec (aasl 418 m, lat. 46°21’22”N, long. 14°9’2”E), 2 ♂♂ and 2 immatures on P. sylvestris, 6 ♀♀, 6 ♂♂ and 4 immatures on Q. robur, 1 ♀ on Picea abies (L.) H. Karsten (Pinaceae), 1 ♀ and 5 immatures on Aesculus hippocastanum L. (Hippocastanaceae), 1 ♀ on Prunus padus L. (Rosaceae), 1 ♀ and 1 ♂ on J. regia and 2 ♀♀ on Fraxinus excelsior L. (Oleaceae), 21/ VI /2019; Kranj (aasl 434 m, 46°16’6”N, 14°20’26”E), 2 ♀♀, 1 ♂ and 3 immatures on P. abies and 4 immatures on Sambucus nigra L. (Adoxaceae), 21/ VI /2019; Spodnje Škofije-Purissima (aasl 50 m, lat. 45°34’21”N, long. 13°46’31”E), 4 ♀♀ and 1 ♂ on Capsicum annuum L. (Solanaceae), 11/VII/2019. Remarks: The description and measurements of the adult females collected agree with those provided by Chant and Yoshida (1990), by Ferragut et al. (2010) for specimens from Spain and by Doker et al. (2019) for specimens from Bosnia-Herzegovina, a close country of Slovenia.

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