... (c) the aids referred to in the first subparagraph of paragraph 1 and in paragraph 3 may be granted for schemes for the re-establishment of trees damaged by frost during the winter of 1986/87 which are begun up to 31 December 1990 in the case of citrus plantations whose varietal composition already satisfied consumer requirements before the frost, where such re-establishment schemes are carried out by: ... - cutting off the trunk or main or secondary branches and top grafting of the varieties grown before the frost or other varieties of citrus fruit which meet consumer requirements.