1) Anton Jansa
2) L. L. Langstroth
3) Johann Dzierzon
4) Karl Kehrle
Explanation:
World Bee Day was declared by the United Nations General Assembly and it was celebrated for the first time on May 20, 2018, in Slovenia.This day marks the birthday of Anton Janša (1734) who pioneered the modern beekeeping techniques in his native Slovenia in the 18th century.Slovenia had proposed to celebrate May 20 as World Bee Day. In December 2017, The United Nations and the UN Member States approved Slovenia’s proposal and since 2018 this day is celebrated.