Poster Presentation Science Protecting Plant Health 2017

Investigating the longevity and host range of Cucumber green mottle mosaic virus (CGMMV) in the Northern Territory (#325)

David A Lovelock 1 , Nadine Kurz 1 , Sharl Mintoff 1 , Merran Neilsen 1 , Lucy Tran-Nguyen 1
  1. Department of Primary Industry and Resources, Berrimah, NT, Australia

Cucumber green mottle mosaic virus (CGMMV) is a tobamovirus that is able to infect a number of economically important cucurbits crops including melons.  The first detection of CGMMV in Australia was reported in the Northern Territory (NT) in September 2014; as of January 2017 25 properties in the NT have been identified as CGMMV positive.  Initially all infested properties (IP) were placed under quarantine for a period of two years, where all host plants including cucurbitaceae weeds were destroyed.  Previous research has indicated CGMMV is viable for up to nine months in host free soils.  Four IP with varying soil types and climates in the NT were chosen to determine the longevity of the virus 12 months into quarantine.  At 12, 15 and 18 months of the quarantine period, 80 soil samples were taken from each IP at three intervals, with plant bioassays conducted to determine the viability of any remaining virus.  A field trial was also conducted on all four properties at the initial soil sampling point (12 months into the quarantine period).  At the initial test period of 12 months, 2 IP from the bioassay and 1 IP from the field trial tested positive for CGMMV, while all 4 IP tested positive in the 15 month bioassays.  As there is potential for greater spread and crop loss due to the sustained longevity of the virus, commercially viable crops for the NT have been chosen to determine if the virus is able to infect a wider range of plant host.  These potential non-host plants include; sweetcorn, capsicum, okra, snake bean, peanuts and sorghum.