Taipei has given a new explanation to justify Taiwanese President Chen Shui-bian's order to tighten monitoring of islanders' investments on the mainland. The head of the island's Mainland Affairs Council claimed Mr Chen had advocated 'active management' of mainland investments because Beijing had demanded Taiwanese investors provide new farm technology to Fujian . 'According to the intelligence gathered by our security authorities, [President] Hu Jintao , in his visit to Fujian in January, demanded Taiwanese businessmen provide new crop species and new technology to Fujian every month,' Joseph Wu Jau-shieh told the government-controlled Chinese Television Service. 'It is totally destructive to Taiwan's agriculture industry.' He said Taiwan had a number of unique farming technologies, but in the past two years some had been leaked to, or stolen, by the mainland. 'We need to help Taiwanese look at this risk and engage in active management of their mainland investments, to protect Taiwan's agriculture and farmers' interests.' Mr Wu's comments came after local businessmen sharply criticised Mr Chen for intensifying his feud with the mainland at the expense of their business interests. In a statement on January 1, Mr Chen unveiled his plan to tighten controls on mainland investments and promote a separate identity for the island. During a January 29 statement, he said he would scrap the National Unification Council, a body that leaves open the possibility of cross-strait unification. Mr Wu said 'active management' aimed to protect Taiwanese from mainland unrest that could affect their investments.