The organics industry body says many products typically eaten through the warmer months are the most heavily contaminated with pesticides.
A food safety group, the Safe Food Campaign, has released a list of 12 products including celery, canned peaches, apples, plums, butter and bread that have been shown to have the highest content of pesticide residues.
The figures are based on data from the Food Safety Authority.
Organics Aotearoa New Zealand chief executive Jon Tanner says it is not surprising to find chemical residues still present in products.
He says it is of particular concern for children who have a lower body weight and consume the foods over a long period.
Analysis from the Food Safety Authority released earlier in this year in its Total Diet Survey showed there was a continuing decline in chemical residues and contaminants in food products.