Chili Pepper Farmers' Pesticide Use and Residues under Thailand's Public Good Agricultural Practices Standard: A Case Study in Chiang Mai Province

This multi-level study focuses on Thailand's public good agricultural practices certification standard (Q-GAP) and compares the performance of 100 certified and 229 uncertified growers regarding their pesticide use practices and the levels of pesticide residues detected in on-farm samples. Chili pepper, a crop primarily marketed domestically, was the focal point of this study conducted in the production context of Chiang Mai province. The data for the study were collected through field interview surveys and chili pepper sample collections. The collected crop samples underwent organophosphate pesticide and synthetic pyrethroid analyses using gas chromatography. Statistical analysis techniques, including one-way ANOVA, chi-square tests, probit regression, and multiple linear regression, were employed to analyze the numerical data using the Stata software. The study's findings revealed several key points. The certified farmers' main motivation for adopting Q-GAP was to meet market requirements, rather than ensuring safety assurance. They exhibited a significantly lower adoption of insecticides compared to the uncertified farmers, but no significant differences were observed for fungicide or herbicide adoption. The analysis of the pesticide residue results yielded mixed findings, making it challenging to conclude whether certified farmers have better control over pesticide residues compared to uncertified farmers. A probit regression analysis highlighted the critical importance of training for growers' adoption of the standard.