biosecurity built on science Understanding the role of alternative host plants in tomato potato psyllid and Liberibacter life cycle and ecology Jessica Dohmen-Vereijssen Natasha 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
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Session 5: Research impact – an end-user perspective: Tomato potato psyllid and liberibacter ecology
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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
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