Previously known as Physicians and Scientists for Responsible Genetics PSRGNZ - Charitable Trust
As required under the new 2005 Charities Act, PSGR has reregistered as a charitable trust.

Dr John R Clearwater
Researcher and consultant

John Clearwater was a founding member of PSRG in 1998, and one of six initial Trustees. Ill health forced John to relinquish his Trusteeship in 2008. It was with sadness we accepted his resignation. John has consistently made valid contributions and supported PSRG. We will miss his involvement and commitment, and especially his sense of humour. Keep well in the future, John.


Dr John Clearwater has a PhD from the University of Alberta, Edmonton, Canada, and a BSc and MSc from Massey University, Palmerston North, New Zealand. He is the principal scientist at Clearwater Research and Consulting.

From 1975 to 1979, Dr Clearwater carried out ecological research on the sorghum shoot fly at the International Centre of Insect Physiology and Ecology in Nairobi, Kenya.

In 1979, he returned to New Zealand and joined the DSIR, transferring in 1992 to Hort Research.

During his career, Dr Clearwater developed a method of controlling codling moth with pheromones and in 1992 produced the first New Zealand export crop of organic apples with Tony Belcher of Waihi. After failing to convince his managers of the value of this achievement, he resigned and set up a programme of organic apple growing in the Hawkes Bay. This followed the invitation of a local grower, John Bostock, and John Mangan of Freshco. By 2001, this programme had grown to include over 50 growers and five percent of New Zealand’s apple growers. By the 2000/2001 season, the best return was $80/carton of organic Royal gala apples on the US market, compared to $8.25 (loss of $1/carton) for conventional apples. The biological insecticide Bacillus Thuringiensis is a key tool in this activity.

Dr Clearwater provided the pheromone-based monitoring system for the successful programme that eradicated the White-Spotted Tussock Moth from the suburbs of Auckland. The monitoring allowed accurate placement of the biological insecticide B. thuringiensis.

Number of referred publications:  29.

May 2008