The new contract between the partners stipulated that the grandson of Lodewijk Adriaan Insinger, the Jonkheer (Squire) Lodewijk Henrick Johan Mari van Asch van Wijck (born in 1928), known as Henk would join the company later on. In October 1950 Lodewijk Adriaan died, and his daughter Inès van Asch van Wijck (1901-1984) replaced him in the role of senior partner. On 1 January 1955, her son Henk was in turn taken into the partnership. As his expertise was in the field of tropical cultivation, he took on the merchant side. As their forefathers had done before, the two great-nephews did everything they could to galvanise the various businesses. On the financial side they were especially focused on banking and brokerage, but they also took direct stakes in companies, joined financial syndicates and banking consortiums, and provided wealth management and company management services. Unfortunately we can only describe this period in very general terms, as we do not have any annual reports. As far as non-banking (in the strict sense of the word) activities were concerned, only the house construction company Huizenmaatschappij grew steadily thanks to prudent management. In 1949 Indonesian independence led to Insinger losing ownership of its plantations.
In 1953, the future of the agricultural Cultuurmaatschappij was thus in jeopardy. From 1919 onwards the company had in fact only enjoyed four profitable years and the accumulated losses had risen to 400,000 guilders. However, the family remained very attached to this company, which was so much a part of their history, and there was an even more businesslike reason for retaining it since there was now new potential for cultivating citrus fruit. Before the war, the colonial government of Surinam, in a bid to encourage coffee production had created a system of subsidies conditional on citrus fruit also being cultivated. Insinger had therefore planted thirty hectares of oranges and grapefruit, which became productive during the war. In order to sell the fruit in the Netherlands, Insinger signed a marketing contract with Vereenigd Importeurskantoor voor Groenten en Fruit (the United Office for Importing Fruit and Vegetables) which proved to be very beneficial. The company decided to extend the amount of land being used for citrus cultivation. In addition, in order to ensure supplies to the Betke Company, new cocoa tree plantations were added while the cultivation of coffee was abandoned. Encouraged by their initial success, the partners launched into producing fruit juice with local Surinam partners and founded a subsidiary called Insico in the Netherlands, whose mission was to market tropical fruit grown in Surinam and European countries such as Spain, Greece and Italy. Unfortunatedly none of these initiatives met with the hoped-for success and the Surinam activites were sold off during the 1970s.
In 1958, Betke was faced with cumulative losses of over 2 million guilders, and also owed Insinger 2.8 million. Attempts to sell the company came to nothing. The option of moving the firm to Malaysia or Algeria was looked into, but then dismissed.
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