NAME OF THE ORGANISM: Claviceps purpurea (CLAVPU)
GENERAL INFORMATION ON THE PEST
Name as submitted in the project specification (if different to the preferred name):
1- Identity of the pest/Level of taxonomic listing:
Is the organism clearly a single taxonomic entity and can it be adequately distinguished from other entities of the same rank?
Is the pest defined at the species level or lower?:
Can listing of the pest at a taxonomic level higher than species be supported by scientific reasons or can species be identified within the taxonomic rank which are the (main) pests of concern?
- Not relevant: Cereals (including rice) sector
Is it justified that the pest is listed at a taxonomic rank below species level?
- Candidate: Cereals (including rice) sector
2 – Status in the EU:
Is this pest already a quarantine pest for the whole EU?
Presence in the EU:
Justification (if necessary):
The pest is present in Austria, Belgium, Bulgaria, Croatia, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Lithuania, Netherlands, Poland, Portugal, Romania, Spain and Sweden (CABI, 2012).
HOST PLANT N°1: Triticum durum (TRZDU) for the Cereals (including rice) sector.
Origin of the listing:
2 - Cereals sector: Council Directive 66/402/EEC
Plants for planting:
3 - Is the pest already listed in a PM4 standard on the concerned host plant?
4 - Are the listed plants for planting the main* pathway for the "pest/host/intended use" combination? (*: significant compared to others):
Triticum is recorded as a host plant at the genus level (CABI, 2012). Sclerotia can be transported with seeds. Alternative hosts can serve as a source of infection. Wind and insects can transport ascospores, delevoped from sclerotia but are a less significant pathway than contaminated seeds (see possible control of weeds).
5 - Economic impact:
Are there documented reports of any economic impact on the host?
Ergot tends to be less common on wheat, barley and oat (Compendium of Wheat Diseases, 2010). It causes the production of alkaloids toxic for human and animal consumption. As a consequence ergot is regulated in cereal grains (maximum 1g of sclerotia/kg of grains for the animal consumption according to the EU Directive 32/2002 and regulation 574/2011 - except on maize and rice; maximum 0,5g sclerotia/kg of grain cereals for the human consumption according to the modified regulation 1881/2006). Over these thresholds, cereal grains are unsellable which causes direct impact for the producer and/or a risk for the final consumer.
What is the likely economic impact of the pest irrespective of its infestation source in the absence of phytosanitary measures? (= official measures)
Is the economic impact due to the presence of the pest on the named host plant for planting, acceptable to the propagation and end user sectors concerned?
If seed is mixed with large numbers of sclerotia the crop can be heavily infected during vegetation followed by yield and quality losses; Losses from Claviceps purpurea can occur through direct seed replacement, increased sterility of neighbouring spikelets and reduced kernel weight due to diversion of host nutrients at the expense of adjacent florets (CABI, 2012).
6 - Are there feasible and effective measures available to prevent the presence of the pest on the plants for planting at an incidence above a certain threshold (including zero) to avoid an unacceptable economic impact as regards the relevant host plants?
Planting seed free and definition of tolerance levels for seeds. Seed cleaning reduces the primary inoculum source and the economic impact for the intended use. Control of grassy weeds. A crop rotation that allows for a 1-year absence of gramineous host will markedly reduce the number of sclerotia in the fields (Compendium of Wheat Diseases and Pests, 2010).
7- Is the quality of the data sufficient to recommend the pest to be listed as a RNQP?
CONCLUSION ON THE STATUS:
Recommended for listing as an RNQP, based on data.
8 - Tolerance level:
Is there a need to change the Tolerance level:
Proposed Tolerance levels:
Not more than 1 (pre-basic or basic) or 3 (certified) sclerotia or fragments found in a representative sample of the seed lot of a size specified in column 4 of Annex III. Ways of achieving this threshold may be left to the producers. Information from field inspections may be provided to the applicant to inform their subsequent decisions on certification and seed cleaning.
9 - Risk management measures:
Is there a need to change the Risk management measure:
Proposed Risk management measure:
Measures do not need to be specified (see defined thresholds).
- Australia (2016), online, 2016. Database. Ergot fungi of Australia. Host index. Biosecurity Queensland, Department of Agriculture, Fisheries and Forestry. Available from http://collections.daff.qld.gov.au/web/key/ergotfungi/Media/Html/host.html;
- CABI (Centre for Agricultural Bioscience International), online, 2012. Datasheets Claviceps purpurea (ergot). Invasive species compendium. CABI, Wallingford, UK. Available from http://www.cabi.org/isc/datasheet/13794;
- Compendium of Wheat Diseases and Pests (2010) Third edition. The American Phytopathological Society;