EU import requirements for plants and plant products have been harmonized and are published in a single directive.  Unlike veterinary products, there is only one model certificate for all plant products in accordance with international regulations laid out by the International Plant Protection Convention of the Food and Agriculture Organization of the United Nations. (See: https://www.ippc.int/en/) 

Phytosanitary certificates are issued by APHIS inspectors, who attest to specific requirements of EU legislation by making additional declarations in the relevant boxes.