Funding for this research was provided by:
Bundesministerium für Bildung und Forschung
Received: 22 August 2020
Accepted: 13 January 2021
First Online: 16 February 2021
Compliance with ethical standards
: All authors declare that they have no conflict of interest.
: No specific permissions were required for these locations/activities and sampling was done with the agreement of the farmers.