| Date post: | 11-Feb-2017 |
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Science |
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biosecurity built on science
Understanding the role of alternative host plants in tomato potato psyllid and Liberibacter life cycle and ecology
Jessica Dohmen-VereijssenNatasha Agnew, Anna-Marie Barnes, Ruth Butler, Kyla Finlay,
David Logan, Kevin Powell, Aleise Puketapu, Mano Sandanayaka, Shirley Thompson, Isabel Valenzuela, Alan Yen
Plant Biosecurity Cooperative Research Centre
biosecurity built on science
What is the problem?
Tomato potato psyllid (TPP, Bactericera cockerelli) TPP vectors Candidatus Liberibacter solanacearum (CLso) CLso is putative agent causing zebra chip disease in potato But tomato, capsicum, tamarillo, chili, eggplant are affected too
biosecurity built on science
Significant economic losses across NZ’s horticulture industry
March 2006, Bactericera cockerelli (tomato potato psyllid, TPP) found in tomato crop near Auckland
April 2008, Candidatus Liberibacter solanacearum (CLso) – a new to science pathogen - confirmed in glasshouse capsicum crop
May 2008, CLso confirmed in potatoes showing zebra chip disease near Auckland
Potato and tamarillo industry most severely impacted (Ogden, 2012) Reduced yield and quality, increase management costs
Potato: NZ$47-56M losses in 2008-09Tamarillo: 80 growers lost in 5 yearsGreenhouse tomato: 4-6% yield loss (Ogden, 2012)
biosecurity built on science
What other plant hosts for B. cockerelli are out there?
TPP host plant in Solanaceae– these are widespread in Australia and New Zealand: crops and weeds, cultural uses too
Knowledge gap: ecology of TPP and CLso related to their non-crop host plants
biosecurity built on science
Host plant surveys around crops
Host plants of TPP and CLso are not restricted to crop species, and include weed species, which provides challenges for surveillance, eradication and management– All TPP life stages were present on non-crop host plants throughout the year– So they are not alternative hosts, but hosts– Jerusalem cherry and thorn-apple tested positive for CLso in Hawke’s Bay
biosecurity built on science
Spatiotemporal dynamics of TPP throughout the year
There was a low background population of B. cockerelli flying around in the environment
When African boxthorn was present adjacent to a crop, there was increased activity nearby and an edge effect may be observed in the host crop
B. cockerelli multiplied in the crop but did not disperse far A desiccated crop increased adult flight in B. cockerelli
biosecurity built on science
How is New Zealand using the knowledge generated?
Increased awareness– non-crop host plants, especially by crop scouts– year-round presence of TPP on these plants
Tamarixia triozae – use perennial non-crop host plants?– survival of parasitoid when crop is absent
biosecurity built on science
What is the main message of this slide? Non-crop host plants are important in the ecology of B. cockerelli
This has implications for - biosecurity preparedness plans - surveillance and monitoring (techniques and locations)- pest and disease management
For more information, please email
Twitter: @JVereijssen
