sustainability Article Domestic Gardens Mitigate Risk of Exposure of Pollinators to Pesticides—An Urban-Rural Case Study Using a Red Mason Bee Species for Biomonitoring Martin Šlachta 1,* , Tomáš Erban 2 , Alena Votavová 3, Tomáš Bešta 4, Michal Skalský 5, Marta Václavíková 6, Tat’ána Halešová 6, Magda Edwards-Jonášová 1, Renata Vˇceláková 1 and Pavel Cudlín 1 1 Global Change Research Institute of the Czech Academy of Sciences, Lipová 1789/9, 370 05 Ceskˇ é Budˇejovice,Czech Republic;
[email protected] (M.E.-J.);
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[email protected] (P.C.) 2 Crop Research Institute, Drnovská 507/73, 161 06 Praha 6-Ruzynˇe,Czech Republic;
[email protected] 3 Agricultural Research, Ltd., Zahradní 1, 664 41 Troubsko, Czech Republic;
[email protected] 4 Institute of Hydrobiology of the Czech Academy of Sciences, Na Sádkách 702/7, 370 05 Ceskˇ é Budˇejovice,Czech Republic;
[email protected] 5 Research and Breeding Institute of Pomology Holovousy Ltd., Holovousy 129, 508 01 Hoˇrice,Czech Republic;
[email protected] 6 ALS Limited, ALS Czech Republic, Na Harfˇe336/9, 190 00 Praha 9-Vysoˇcany, Czech Republic;
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[email protected] (T.H.) * Correspondence:
[email protected] Received: 26 September 2020; Accepted: 10 November 2020; Published: 12 November 2020 Abstract: Domestic gardens supply pollinators with valuable habitats, but the risk of exposure to pesticides has been little investigated. Artificial nesting shelters of a red mason bee species (Osmia bicornis) were placed in two suburban gardens and two commercial fruit orchards to determine the contamination of forage sources by pesticides.