New Zealand's economy would lose up to $11.4 billion without crop protection products, according to a report from the New Zealand Institute of Economic Research.
The report also showed crops would lose 30 per cent of their value overall.
The report covers forestry, pasture, horticulture, field crops and vegetable production.
Agcarm chief executive, Mark Ross, said the report highlighted the importance of the crop protection industry to New Zealand's economy.
Agcarm is a not-for-profit trade association, representing more than 60 companies, that takes a lead role in managing issues of importance to the crop protection and animal medicines industries.