How did the World War 1 effect the farmers?

From an African point of view, WW1 reduced the productivity of most African states that Participated in the war, especially Tanganyika (now Tanzania) which fought under the German Army. Many people were killed and a drastic reduction in productive population. Not many farming activities were possible because the farming fields were battle fields, and the farmers were themselves combatants. The population reduction also triggered the re-breeding of Tsetse flies, which is a vector for the trypanosome which causes Trypanosomiasis in both livestock and humans (Nagana and Sleeping sickness). This is largely because of the complex ecological transformation and the vacuum created on the lands, enabling the extensive growth of bush and woodlands like Miombo in Tanzania. Tsetse was responsible for a great deal of cattle and human deaths; still reducing farmer output.