dieback crop

Phytophthora  Dieback Mapping and Management

Phytophthora Dieback (‘Dieback’) is a soil borne pathogen with a range of hosts in the southwest of Western Australia. These predominantly come from the Proteaceae, Myrtaceae, Xanthorrhoeaceae and Ericaceae and Fabaceae plant families. While some plant species are resistant, others are susceptible to the disease caused by the pathogen resulting in chlorosis, dieback and usually death. The Dieback pathogen is widespread in areas with greater than 800 mm of annual rainfall, less extensive in areas that receive between 600–800 mm and mainly restricted to water-gaining sites in areas that receive 400–600 mm. The pathogen does not occur in areas that receive less than 400 mm of annual rainfall. In Western Australia Dieback is a significant environmental issue for projects between Geraldton in the Midwest and Esperance on the South Coast and is widespread in the Southwest region.

Terratree’s Dieback services P cinnamomi zoospore cysts

Terratree specialises in Dieback mapping and management and Principal Ecologist Joseph Grehan is a Department of Parks and Wildlife (DPaW) certified Dieback interpreter. Terratree also works collaboratively with a group of Dieback Interpreters and therefore has the capacity to undertake large scale disease mapping projects. The skills in mapping and managing Dieback can also be applied to weed and hygiene management.

Terratree offers the following services in the area of Phytophthora Dieback mapping and management:

  • Dieback Interpretation and Mapping
  • Dieback Risk Assessments
  • Dieback Management Planning
  • Dieback Workshops and Education





Featured Project: Iluka Resources Phytophthora Dieback assessment of rehabilitated areas at the Eneabba mine site

Terratree and Moore Mapping assessed approximately 2,000 hectares of rehabilitated areas for Iluka Resources in March and September 2013 for the presence of Phytophthora Dieback. The Dieback assessment of rehabilitation areas was undertaken by the DPaW)certified Dieback interpreters Joseph Grehan and Ian Moore with field assistants Kelby Jennings and Steve Parker.

The areas were assessed in accordance with the survey methods stipulated in ‘Phytophthora cinnamomi and the diseases caused by it – Volume 2: Interpreters Guidelines for Detection, Diagnosis and Mapping’ (CALM 2001) in conjunction with changes in survey methods outlined in draft new guidelines provided by the Disease Standards Officer (DSO). The DSO conducted a standards check on the Dieback assessment being undertaken by Joseph Grehan. The DSO approved the standards check and endorsed the methods being applied in this highly disturbed site with very cryptic disease expression.