The Germans fought in a number of mosquito infested areas. As a result they developed nesstin to cover beds as well as wearable nets for the head. They even had a small dome tent looking shelter made of netting. Mosquitos are a known carrier of illness including Malaria. Mosquitos have been a known carrier of this disease since the  1880s. Netting provides a physical barrier between the mosquito and its intended victim. The Soviet army applied juniper oil to over bed mosquito nets to repel to repel these pests during their WW2 campaigns in Central Asia. I am not certain if the German army was doing something similar.

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These photographs were taken from a number of online sources and auction sites.  They are presented here for educational purposes.