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Cucumber green mottle mosaic virus (CGMMV) update

By December 2, 2016 No Comments

DAFWA is offering a free service to Geraldton cucurbit growers to help develop on-farm biosecurity plans. DAFWA will contact growers to arrange a property visit, to take place in November and December. If successful the service may be offered to other cucurbit growing regions. For more information on the visits, contact James Dee on 9780 6285 or visit agric.wa.gov.au/cgmmv.

Current situation

  • As of November 2016, cucumber green mottle mosaic virus (CGMMV) has been confirmed on commercial cucurbit properties in Kununurra, Geraldton, Carnarvon and Perth, and in native and naturalised weeds in Carnarvon.
  • On-farm biosecurity is the most effective defense against infection and spread – even if CGMMV has not been detected in your area.
  • Biosecurity measures can protect crops against all pest and disease threats – not just CGMMV.
  • Growers now planting summer crops in particular should adhere to biosecurity measures relating to the disposal, destruction or decontamination of any old or infected host materials (see biosecurity tips below).
  • Biosecurity measures are important even where cucurbits are not being grown over summer, such as in Kununurra.
  • DAFWA is currently developing information sheets on disposal and destruction, sampling and decontamination, which will be made available to growers once finalised.
  • The CGMMV National Management Plan was recently endorsed and released.
  • This management plan can be downloaded from the AUSVEG website at com.au.

Important biosecurity tips

  • Farm biosecurity measures should include proper disposal, destruction or decontamination of any materials that could potentially host CGMMV.
  • Host material includes dead or infected plants and fruit, weeds, and volunteer plants.
  • Host material includes in-field risk items such as equipment that has been used in the field, such as plastic mulch, drip irrigation lines, stakes and string.
  • CGMMV can live in the soil for at least two years. All materials that have been in contact with potentially infected plant materials/soil/water should be treated as contaminated.
  • Properties with no summer crops should be kept free of weeds and volunteer plants.
  • Weeds and volunteer plants from fruit that has been ploughed-in could become hosts for CGMMV.
  • Host materials should be removed prior to planting.
  • Alternative crops should be used where CGMMV has been detected, or the area should remain fallow for two years.
  • Include ongoing monitoring and sampling of plants for CGMMV symptoms in farm biosecurity plans. DAFWA is providing free sample testing for cucurbit growers.
  • A reminder that farm biosecurity plans should include hygiene measures relating to vehicles, people and equipment.
  • Be aware there is no ‘one size fits all’. The onus is on growers to tailor biosecurity measures to their own properties.

Next steps

  • Growers can start thinking about their biosecurity needs by using the attached farm biosecurity template and checklist.
  • Growers will be asked to undertake CGMMV surveillance over the next four months in the Perth metropolitan and south west regions.
  • Sampling kits for growers will be available from DAFWA and selected retailers. For more information contact James Dee on 9780 6285.
  • Two CGMMV information sessions and farm biosecurity demonstrations for Waroona-Harvey and Donnybrook-Manjimup growers will be held in mid-January 2017. Further details will be provided by e-update, website and on DAFWA’s Facebook/twitter
  • DAFWA is compiling information to assist infected cucurbit growers maintain economically viable operations. This includes investigation into:
    • Non-host crops that can be grown to provide an economically viable substitute for cucurbit crops in each region, including identification of new market opportunities.
    • CGMMV weed hosts and non-hosts.
    • Virus impact on cucurbit types and varieties.
    • Virus infectivity over time in different soil types in different production systems.
    • Soil sterilising crops.
    • Effectiveness of disinfectants in different production systems.
    • Best practice disposal methods for plant residues.

Reporting

  • Report any suspect signs of CGMMV immediately to DAFWA’s Pest and Disease Information Service on 1800 084 881.

Alternatively, download DAFWA’s MyPestGuide Reporter app to your smart phone, take a photo and follow the prompts on the device.

More information

farm-biosecurity-checklist-nov-16-pdf

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