Yonah and Shmuel Stoller immigrated to Mandate Palestine shortly thereafter and joined the Gdud HaAvoda (The Work Battalion) as part of a group headed by Yitzhak Sadeh. Stoller became involved in agriculture and agricultural research, and in 1938 he headed a group concentrating on the Jordan Valley, and was responsible for developing methods of irrigation, irrigated agriculture and plantations. In particular, Stoller was responsible for the importation and development of conditions suitable for new varieties of bananas, dates and vines.