Forestry
As head of the JNF Forestry Department, Weitz put his visions of Israel as a forested country into practice. He was spurred on by David Ben-Gurion, who told Weitz he wanted a billion trees planted within a decade. In 1949, he proposed a division of labor between the Israeli government and the JNF. The government would engage in applied research in planting techniques, especially in arid areas, and the development of a timber industry. It would also establish nurseries. The JNF would improve indigenous forests, work in afforestation of hilly regions, stop the encroachment of sand dunes and plant windbreakers. Weitz saw plant nurseries and afforestation as a vital source of employment for the masses of new immigrants arriving in the early days of the state. He was guided by the belief that developing a work ethic was imperative for acculturation.
In 1966, Yatir Forest in the Negev was planted at Weitz's urging. He described the project as "rolling back the desert with trees, creating a security zone for the people of Israel." Named for the biblical town of Yatir, it is now Israel's largest planted forest.
Weitz’s never formally studied forestry but his autodidactic perspective was reflective of the period. The forestry strategy he crafted emphasized the economic utility of forests and the importance of the Aleppo pine as the hardiest of local species. As a result, Israel’s forests for its first twenty years were largely mono cultures which would soon suffer serious losses due to natural pests. Weitz frequently clashed with the nascent conservation movement in Israel which found the industrial approach to tree planting that the Jewish National Fund adopted to be objectionable. Today, many of Weitz’s ideas have been replaced with more sustainable approaches to foresting. political views== Weitz was an advocate of population transfer. On June 22, 1941 he wrote in his diary: "The land of Israel is not small at all, if only the Arabs were removed, and its frontiers enlarged a little, to the north up to the Litani, and to the east including the Golan Heights...with the Arabs transferred to northern Syria and Iraq...Today we have no other alternative...We will not live here with Arabs."
According to Ilan Pappe, passages in Weitz's diary in April 1948 show his support for the transfer of Arabs during the 1948 war: "I have drawn up a list of Arab villages which in my opinion must be cleared out in order to complete Jewish regions. I have also drawn up a list of land disputes that must be settled by military means." According to Efraim Karsh, Ben-Gurion rejected the idea, and no such committee was ever established. Nevertheless, Nur Masalha and Benny Morris claim an unofficial Transfer Committee was established in May 1948 composed of Weitz, Danin and Sasson.Later in life, Weitz's views appear to be more conciliatory towards the neighboring Arabs and he is reported to have refused to attend ceremonies of renew Jewish settlements in the West Bank after the 1967 war.
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