Career
Adrian Diel’s father Kaspar Ludwig was a surgeon and apothecary. August Friedrich Adrian, after studying in Giessen and Strasbourg, acquired in 1780 in Giessen a Doctorate in and Surgery. After that, he became a doctor in Gladenbach.
In 1786 he served as practitioner of the Count of Spaur, who was Judge at Imperial Court in Wetzlar, and dealt mainly with Balneology.
In 1790 he took over the office of spa doctor in Bad Ems (Nassau) and at the same time was the district physician at his residence Diez. In the same year Diel became Aulic Councillor, then Private Councillor of the Duchy of Nassau.
He gained importance as a breeder of fruits, and as an author of important pomological writings, and laid the basis for the rise of that science in the 19th Century. In addition to his work on the systematics of the fruit trees Diel also exerted political influence to promote fruit cultivation in the Duchy of Nassau.
After the vineyards had been largely destroyed in the immediate area of Diez because of pest infestation, Diel also created large plum orchards.
The introduction of cherries at higher elevations in the Lahn area and the Nassau government regulation on planting fruit trees by the roadsides and on creating orchards in schools goes back to his initiative. In 1925 the city of Diez named a newly created road as "Dielstraße". In his native city of Gladenbach there"s an „Adrian-Diel-Straße“.
Diels Barceloner Parmäne, Diels große englische Renette and Diels Renette were well-known apple varieties of the 19th Century.
The Dietzer Goldrenette reminds us of the place of his work. As for pears Diels Butterbirne reminds us of the great breeder (cf Liste der Birnensorten).
With the Balduinsteiner Kinderbirne, now lost, Diel also immortalized that Diez belongs to the neighborhoods of Balduinstein.