This project aims to develop a regionally-based research (management) and demonstration programme for psyllid that assesses the range of management options and can provide cost benefit analysis of each method.
The project will focus on developing reduced insecticide management strategies by using thresholds to commence a spray programme (psyllid-count based or Degree Days) and incorporation of agricultural oils into a spray programme to protect the crop from insect pests and consequently from being infected with CLso (TPP) or viruses (aphids).
It is expected to undertake this work at three sites (Pukekohe, Manawatu, Canterbury) with nil, total exclusion with crop covers, grower insecticide management, application based on sticky traps, application based on degree days using selective spray program and a programme combining oils and insecticides. Assessments will include yield, populations of pysllid and beneficials at key times and incidence of zebra chip.
Psyllid work will continue with trials established in Matamata, Manawatu and Canterbury. The incidence, importance and timing of pests varies markedly between potato growing regions in New Zealand.
The aim of the three field trials is to develop regionally focused pest management strategies, initially focussing on tomato potato psyllid (TPP) and zebra chip disease, putatively caused by Candidatus Liberibacter solanacearum (CLso).