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2021

Sammendrag

The soft rot Pectobacteriaceae (SRP) infect a wide range of plants worldwide and cause economic damage to crops and ornamentals but can also colonize other plants as part of their natural life cycle. They are found in a variety of environmental niches, including water, soil and insects, where they may spread to susceptible plants and cause disease. In this chapter, we look in detail at the plants colonized and infected by these pathogens and at the diseases and symptoms they cause. We also focus on where in the environment these organisms are found and their ability to survive and thrive there. Finally, we present evidence that SRP may assist the colonization of human enteric pathogens on plants, potentially implicating them in aspects of human/animal as well as plant health.

Sammendrag

Key words: VKM, risk assessment, Norwegian Scientific Committee for Food and Environment, Norwegian Food Safety Authority, Norwegian Environment Agency, Biowaste, Compost, Plant health, organic waste, Phytosanitary safety, Biogas, Alien organisms Introduction The Norwegian Food Safety Authority (NFSA) and the Norwegian Environment Agency (NEA) have jointly asked the Norwegian Scientific Committee for food and environment for an assessment into treatment methods and validation methods for compost and digestate based on organic waste in relation to plant health and the spread of harmful alien organisms in Norway.  The Norwegian Food Safety Authority will use the report in its supervisory work over companies that produce compost and digestate. The assessment will also provide important input for the regulatory development of several current regulations including regulations on indicator organisms that are used to validate new methods and ensure adequate security with regards to the survival of plant pests. The Norwegian Environment Agency wants to establish whether the methods used in the composting of garden waste and other types of plant waste today are able to ensure that the finished product does not become a source for the spread of harmful alien organisms. This will form the basis for the Norwegian Environment Agency’s guidelines relating to the precautionary provisions in the regulation on alien organisms. This request is limited to an assessment of plant pests and harmful alien organisms (hereinafter alien organisms). The survival of infectious diseases harmful to people and animals is considered in separate assessments. Methods We have conducted initiating workshops for identifying relevant fundamental processes and parameters, of relevant organisms and of relevant search terms for the literature surveys, as well as for discussion and validation. Visits to composting facilities and contact with stakeholders in Norway were also conducted. This information was further implemented in an extensive literature search. This assessment include/encompass organic waste and other materials that are currently treated in biogas and composting facilities, including garden and park waste (incl. soil), plant waste from garden centres, etc., food waste and waste from the food and animal feed industry (including grain/seed husks and waste from enterprises which package and process potatoes and vegetables), manure, bulking agents used in composting facilities, and husks from contracted grain/seed cleaners for sowing. We have used a quantitative risk assessment. The level of confidence in the risk assessment is described, and uncertainties and data gaps identified. Furthermore, we have used re-submission commenting and external expert reviewing before final approval and publication. ...........