Règle correspondante
Switzerland
Practice Relating to Rule 147. Reprisals against Protected Objects
Section D. Objects indispensable to the survival of the civilian population
Switzerland’s Basic Military Manual (1987), in the part dealing with “Hostilities and their limits” and, more specifically, in a provision regarding the prohibition of the taking of reprisals against the civilian population, refers, inter alia, to Article 54 of the 1977 Additional Protocol I. 
Switzerland, Lois et coutumes de la guerre (Extrait et commentaire), Règlement 51.7/II f, Armée Suisse, 1987, Article 25(2).
The manual further provides: “Objects vital to the civilian population, such as drinking water, foodstuffs, crops and livestock as well as agricultural areas, must not … be made the object of reprisals.” 
Switzerland, Lois et coutumes de la guerre (Extrait et commentaire), Règlement 51.7/II f, Armée Suisse, 1987, Article 35.