Following a request from the European Commission, the EFSA Panel on Plant Health (PLH) reviewed Italian technical guidelines and the ANSES (Agence nationale de sécurité sanitaire de l’alimentation, de l’environnement et du travail) opinion on the use of hot water treatment (HWT) on Vitis sp. planting material, assessing its efficacy in the elimination of the xylem-invading bacterial pathogen, Xylella fastidiosa. HWT is a robust and reliable technique used to destroy life stages of pests (insects, nematodes) and to inactivate pathogens (phytoplasma, bacteria, fungi) in dormant plant propagation materials (grapevine and other crops). An effective HWT sanitizes the planting material without affecting plant survival and development. For grapevine, HWT to eliminate the Grapevine flavescence dorée phytoplasma (FD) from planting materials is among the special requirements for the introduction and movement of Vitis sp. to protected zones in the EU. The conditions of 50°C for 45 min, prescribed and recommended to sanitize grapevine planting material against FD, are considered by the Panel to be also effective against X. fastidiosa and its subspecies. Despite uncertainties on variable thermotolerances of the bacteria, a HWT treatment of 50°C for 45 minutes can effectively account for different thermotolerances. It should be noted that the quality of the HWT is subject to the proper application of the operating procedures to guarantee vigorous growth and pathogen freedom of planting material.
Just Published: September, 2015
Scientific Opinions: Opinions of the Scientific Committee/Scientific Panel
In accordance with Article 6 of Regulation (EC) No 396/2005, the evaluating Member State (EMS), the Netherlands, received an application from Bayer Environmental S.A. for the active substance fluopicolide in valerian. In order to accommodate the residues occurring in valerian roots grown in rotation with potato crops treated with fluopicolide, the Netherlands proposed to raise the existing MRL for valerian, from the limit of quantification to 5 mg/kg. The Netherlands drafted an evaluation report in accordance with Article 8 of Regulation (EC) No 396/2005, which was submitted to the European Commission and forwarded to EFSA.
From the use on potatoes where valerian is then planted as a following crop, adequate information was provided to propose raising the MRL in valerian to 7 mg/kg. Adequate analytical enforcement methods are available to control the residues of fluopicolide in valerian roots. Based on the risk assessment results, EFSA concludes that the practice of growing valerian following potato crops treated with fluopicolide will not result in consumer exposure exceeding the toxicological reference values and therefore is unlikely to pose a consumer health risk.