NA Martin 23 Insect-host plant association: how Plant-SyNZtm provides information on the quality of supporting evidence Nicholas A. Martin Research Associate, Landcare Research, Private Bag 92170, Auckland 11072.
[email protected] Very early in the formation of the Plant-SyNZtm database I realised that it was important to show the quality of evidence supporting the association of a herbivore species with a host plant species. The literature varies in its approach. I will take as an example Spencer (1976) who describes Agromyzidae of New Zealand (Insecta: Diptera) and I will focus on the genus Phytoliriomyza (Diptera: Agromyzidae). I have chosen this genus because the association of two Phytoliriomyza species with silver fern, Cyathea dealbata, were highlighted in a recent paper (Thorpe 2021). The Plant-SyNZtm database has a table for herbivore/plant associations and forms for recording and showing information. The key form (Figure 1) shows the name of the herbivore, the host plant, and the reference in which details of the association were published. It also summarises the evidence for the association and gives this a reliability score from 1-10, where for a leaf miner, for example, 10 is for rearing an adult from a larva and/or pupa found in the host plant. The form also shows the name of the assessor and the date of assessment. Three species in the genus Phytoliriomyza, (P. cyathea, P. flavopleura and P. tearohenis) have genitalia that show they belong to a group of species whose larvae are fern feeders (Spencer 1976). Spencer (1976) reports that adults of P.