Trends in Citrus Postharvest Disease Control in Spain
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1 Trends in Citrus Postharvest Disease Control in Spain Citrus Technical Forum 2019 Adelaide, 7 March 2019 Lluís Palou Pathology Laboratory, Postharvest Technology Center (CTP) Valencian Institute of Agrarian Research (IVIA) palou_llu@gva.es
2 ivia Institut Valencià d Investigacions Agràries Centre de Tecnologia Postcollita (CTP)
3 Outline Spanish citrus production and trade Major postharvest diseases in Spain Conventional decay control Citrus integrated production (IP) in Valencia Citrus organic production in Valencia NPIDM in Spain
4 Outline Spanish citrus production and trade Major postharvest diseases in Spain Conventional decay control Citrus integrated production (IP) in Valencia Citrus organic production in Valencia NPIDM in Spain
5 Spanish citrus production and trade
6 Spanish citrus production and trade
7 Spanish citrus production and trade 2017 Orange: 35% Mandarin: 55% Lemon: 50% Total citrus: 45%
8 Outline Spanish citrus production and trade Major postharvest diseases in Spain Conventional decay control Citrus integrated production (IP) in Valencia Citrus organic production in Valencia NPIDM in Spain
9 Major postharvest diseases Major postharvest diseases in Spain Green mold Penicillium digitatum Blue mold Penicillium italicum
10 Major postharvest diseases Green and blue molds >80% total decay in Mediterranean climate areas: Spain, South Africa, California... Allcitrus species and cultivarsare susceptible Both preharvest and postharvest fruit contamination: need to control incipient field infections and potential packinghouse reinfections
11 Major postharvest diseases Strictwoundpathogens Easy fungicide-resistance development Readily and massive spore dissemination by air currents Very high growth rate (new generation in about 7 days at 20-25ºC) Natural fruit resistance decreases with fruit age Green and blue molds Microwounds Epidemiological cycle of Penicillium digitatum 8 days 4 days
12 Major postharvest diseases Sour rot Wound pathogen Present in orchard soil. Water dissemination (rain splash). Contamination of field packages Watery rot with characteristic odor. Attracts fruit flies Weak pathogen. Senescent or overmature fruit more susceptible Frequent secondary infection by Penicilliumspp. Control Sanitation very important Specific fungicides: guazatine, propiconazole Sour rot Geotrichum citri-aurantii
13 Major postharvest diseases Anthracnose Colletotrichum gloeosporioides Anthracnose Latent pathogen Field infection by appressoria, especially on the fruit stem-end Dry or firm rot. Salmon-colored conidial masses under humid conditions Leathery silver gray large lesions on fruit degreened with ethylene. Ethylene induces appressorium germination and decay Weak pathogen. Senescent or overmature fruit more susceptible Control Field measures Limited efficacy of common fungicides: pyrimethanil better than imazalil
14 Outline Spanish citrus production and trade Major postharvest diseases in Spain Conventional decay control Citrus integrated production (IP) in Valencia Citrus organic production in Valencia NPIDM in Spain
15 Conventional decay control HARVEST FUNG. DREN., FOAM, DIP COLOR SORTING DEGREENING Decay control with conventional chemical fungicides AIR PRE-COOLING COLD STORAGE TRANS. TO PACKINGHOUSE WASH PRE-DRYING WATER WAX + FUNGICIDE DRYING HAND SELECTION SORTING PACKAGING PALLETIZATION LOADING TRANSPORTATION TO MARKETS FUNGICIDE (DRENCHER) COLD STORAGE
16 Conventional decay control Approved fungicides for citrus postharvest treatment in the EU Fungicide Approval Expiration MRL (mg/kg) Imazalil 01/01/ /12/ Propiconazole* 01/06/ (O) 5 (M, G, L) Fosetyl-Al 01/05/ /04/ Ortophenilphenol 01/01/ /12/ Prochloraz 01/01/ /12/ Pyrimetanil 01/06/ /04/ Tiophanate-methyl 01/03/ /10/ Thiabendazole 01/04/ /03/ Fludioxonil 01/11/ /10/
17 Conventional decay control EU Pesticides Database
18 Conventional decay control Approved fungicides for citrus postharvest treatment in the EU Fungicide Approval Expiration? MRL (mg/kg) Imazalil 01/01/ /12/ Propiconazole* 01/06/ (O) 5 (M, G, L) Fosetyl-Al 01/05/ /04/ Ortophenilphenol 01/01/ /12/ Prochloraz 01/01/ /12/ Pyrimetanil 01/06/ /04/ Tiophanate-methyl 01/03/ /10/ Thiabendazole 01/04/ /03/ Fludioxonil 01/11/ /10/
19 Conventional decay control EU Pesticides Database
20 Conventional decay control HOWEVER In 2018, European food Safety Authority (EFSA) requested more data to conclude on IMZ safety (toxicity of 3 metabolites) More data from IMZ Task Force (manufacturers) expected by June 2019 If data are not satisfactory, no MRL derived MRL will drop to LoQ(0,01 ppm) for citrus and bananas High risk of IMZ not approved by January 2020 EU Pesticides Database
21 Conventional decay control MRL for citrus postharvest fungicides Active ingredient European Union Switzerland USA Canada Fludioxonil Imazalil Fosetyl-Al a 75.0 b 75.0 b OML c Thiophanate methyl d NT e 10.0 f Ortho-phenyl phenol (and Na salt) 5.0 g Pyrimethanil OM c 10.0 Prochloraz NT NT Propiconazole 9.0 O; 5.0 ML c Tebuconazole 0.9 O; 5.0 ML c NT 1.0 O 1.0 O Thiabendazole 7.0 h Values are mg/kg c O = Orange; M = Mandarin; L = Lemon. d Potential production of carbendazim as a metabolite. e NT = No tolerance. f Sum of thiophanate methyl and carbendazim residues.
22 Conventional decay control Efficacy of common postharvest fungicides PATHOGEN/FUNGICIDE Imazalil Thiabendazole SOPP Fosetyl-Al Pyrimethanil Prochloraz Penicillium digitatum Penicillium italicum Alternaria citri Alternaria alternata Botrytis cinerea Colletotrichum gloeosporioides Diplodia natalensis Geotrichum citri-aurantii Rhizopus stolonifer Phytophthora citrophthora Phomopsis citri Efficacy level: ++++ Excelent +++ Good ++ Medium + Moderate 0 Null
23 Conventional decay control Problems related to conventional fungicides Chemicalresidues: on/in fruit; environment Proliferation of resistant pathogenic fungal strains Lengthy and costly for companies the development and registration of new active ingredients Limited access to particular markets Some export clients demand lower residues than MRL (maximum residue limit) established by legislation (EU) Increasingimportanceof organicor green markets
24 Outline Spanish citrus production and trade Major postharvest diseases in Spain Conventional decay control Citrus integrated production (IP) in Valencia Citrus organic production in Valencia NPIDM in Spain
25 Integrated Production (IP) Citrus Integrated Production (IP) Type of regulated agricultural production Maximize the use of natural resources Rationalize the use of agrochemicals Minimize the environmental impact Contribute to long-term sustainable agriculture Consider social aspects Particular legislation for each region in Spain Valencian Community Catalonia Andalucia Etc.
26 Integrated Production (IP) Valencian Citrus Integrated Production 2017 Approx. 7% of total Valencian citrus cultivated area
27 Integrated Production (IP) Valencian Citrus Integrated Production First citrus IP regulations from Last revision different regulated topics, including: Harvest Postharvest treatments Packaging and storage 19 technical annexes Official register of IP growers Contract between grower and control and certification company approved by regional government Compulsory up to date farm log book Growers can access to EU co-funded subsidies
28 Integrated Production (IP) Valencian Citrus Integrated Production Some rules and recommendations for topic Harvest Dependent on species and cultivar MI = SSC/TA = 6-8 Minimum = 33-40% Rind color index (CI = 1000a/L*b; Hunter) = between +4 and +6 Some rules and recommendations for topic Postharvest treatments Degreening: <5 ppm ethylene, <60 h, 20-22ºC Only waxes ingredients approved as EU food additives Available for use all approved conventional postharvest fungicides Mandatory analysis of active ingredients and MRL
29 Outline Spanish citrus production and trade Major postharvest diseases in Spain Conventional decay control Citrus integrated production (IP) in Valencia Citrus organic production in Valencia NPIDM in Spain
30 Organic production Valencian Citrus Organic Production Regulation (EU) 2018/848 on organic production and labelling of organic products (repealing Council Regulation (EC) No 834/2007) Valencian control authority: Comité d Agricultura Ecològica de la Comunitat Valenciana (CAECV) Official register of organic growers Official register of organic companies (manufacturers, traders, ) Certification of production and procedures
31 Organic production Valencian Citrus Organic Production 2017 Total citrus = 2250 ha <1.0% of total Valencian citrus cultivated area
32 Outline Spanish citrus production and trade Major postharvest diseases in Spain Conventional decay control Citrus integrated production (IP) in Valencia Citrus organic production in Valencia NPIDM in Spain
33 NPIDM in Spain NPIDM Non-Polluting Integrated Disease Management Knowledge of pathogen epidemiology and all preharvest, harvest, and postharvest factors that can influence the incidence of postharvest diseases (disease triangle) Take action on every factor at the right moment through non-polluting means to minimize economical losses Preharvest actions Actions at harvest Postharvest actions
34 NPIDM in Spain Current use of conventional fungicides at low doses to comply export private regulations. Risks of resistance increase Introducing the concept Primarily based on green and blue mold control Great variety of postharvest handling practices. Many particular research needs Orchard/packinghouse: different owners During preharvest phase No specific actions NPIDM in Spain
35 NPIDM in Spain Actionsatharvest Emphasize careful harvest!! Pickers paid by weight, not by time Postharvest actions NPIDM in Spain Emphasize appropriate fruit transportation and handling Emphasize effective packinghouse sanitation Increasing use of fruit surface sanitizers. Alternatives to chlorine: PAA, H 2 O 2, mixtures
36 NPIDM in Spain NPIDM in Spain Postharvest actions Importance of availability of soak tanks for integration of treatments (available in few facilities) Limited use of heated solutions of GRAS salts (sodium carbonate, sodium bicarbonate, potassium sorbate) Limited use of edible coatings containing GRAS salts (potassium sorbate) or plant extracts Limited ozonation of storage rooms
37 Thanks for your attention!! Lluís Palou Pathology Laboratory, Postharvest Technology Center (CTP) Valencian Institute of Agrarian Research (IVIA)
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