Related Rule
Germany
Practice Relating to Rule 73. Biological Weapons
Germany’s Soldiers’ Manual (1991) provides: “The use … of bacteriological means of warfare is prohibited.” 
Germany, Taschenkarte, Humanitäres Völkerrecht in bewaffneten Konflikten – Grundsätze, Bearbeitet nach ZDv 15/2, Humanitäres Völkerrecht in bewaffneten Konflikten – Handbuch, Zentrum Innere Führung, June 1991, p. 5.
Germany’s Military Manual (1992) proscribes “the use of bacteriological weapons” and refers to the 1925 Geneva Gas Protocol. It further states:
The development, manufacture, acquisition and stockpiling of bacteriological (biological) and toxin weapons is prohibited [Biological Weapons Convention]. These prohibitions shall apply both to biotechnological and synthetic procedures serving other but peaceful purposes. They also include genetic engineering procedures and micro-organisms altered through genetic engineering. 
Germany, Humanitarian Law in Armed Conflicts – Manual, DSK VV207320067, edited by The Federal Ministry of Defence of the Federal Republic of Germany, VR II 3, August 1992, English translation of ZDv 15/2, Humanitäres Völkerrecht in bewaffneten KonfliktenHandbuch, August 1992, §§ 438–439.
Germany’s IHL Manual (1996) states: “International humanitarian law prohibits the use of a number of means of warfare which are of a nature to violate the principle of humanity and to cause unnecessary suffering, e.g. … bacteriological means of warfare, e.g. substances which cause disease”. 
Germany, ZDv 15/1, Humanitäres Völkerrecht in bewaffneten Konflikten – Grundsätze, DSK VV230120023, Bundesministerium der Verteidigung, June 1996, § 305.
Germany’s Soldiers’ Manual (2006) states: “German service men or service women are prohibited from using in particular the following means of combat in armed conflicts: … bacteriological weapons”. 
Germany, Druckschrift Einsatz Nr. 03, Humanitäres Völkerrecht in bewaffneten Konflikten – Grundsätze, Erarbeitet nach ZDv 15/2, Humanitäres Völkerrecht in bewaffneten Konflikten – Handbuch, DSK SF009320187, Bundesministerium der Verteidigung, R II 3, August 2006, p. 5.
Germany’s Law Introducing the International Crimes Code (2002) punishes anyone who, in connection with an international or non-international armed conflict, “employs biological … weapons”. 
Germany, Law Introducing the International Crimes Code, 2002, Article 1, § 12(1)(2).
In 1983, the German Government declared in Parliament that biological weapons were as such prohibited. 
Germany, Lower House of Parliament, Reply by the government to a question in Parliament, Kriegsvölkerrechtliche Verträge, 5 October 1983, BT-Drucksache 10/445, 1983, p. 14.