The "German Agricultural Society" was founded in 1885 by Max Eyth (1836-1906). It is an organization of the German agricultural and food industry with its headquarters in Frankfurt am Main and has around 20,000 members. The non-profit organization is financed through membership fees, their income for services and public grants. The primary objective is to promote quality for the agriculture and food industry, as well as to make scientific and technical knowledge practically available and suitable. Over 50 specialist committees, working groups and commissions with around 1,000 volunteer experts from science and practice work in the DLG specialist center. In the "DLG Test Center for Food" in Frankfurt am Main, foods such as bread, beer, dairy products and wine are tested intensively and high-quality products are awarded in the three levels of bronze, silver or gold. The "DLG test" certifies the high quality of the product.
Since 1999 too wineries and Winzergenossenschaften checked and the annual winners of the competitions were awarded the certificates "DLG Recommended Winery" or "DLG Recommended Wine Cooperative". The companies that have an “above-average quality, environmental and customer orientation” in all phases of the production process through to marketing are awarded the certificate in their production methods, facilities and the presentation of their products. The validity of the award is initially limited to 3 years. Subsequently, annual checks are carried out to determine whether the criteria are still being met. The DLG runs through the Official test number in addition, on a voluntary basis, through a special examination and, if the result is positive, awards German wine seal in three colors. Every year over 15,000 wines and sparkling wines are produced sensory Tastings examined. See also under Wine-producing institutions,