บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Residue levels of the EBDC fungicides on three leafy vegetables in Florida.

Raid, R. N., Nowak, N. C., Elliot, C. L., Snyder, G. H. and Nuessly, G. S.

Proceedings of the Florida State Horticultural Society Year: 1995 Issue: No. 108 Pages: 207-212 Ref: 8 ref.

1995

บทคัดย่อ

Residue levels of the EBDC fungicides on three leafy vegetables in Florida.

ABSTRACT :

 

The primary objective of this investigation was to gather data on residue levels of the ethylenebisdithiocarbamate (EBDC) fungicide maneb on lettuce (Lactuca sativa) and escarole (Cichorium endivia). These studies are subsequent to recent label changes following re-registration of maneb for these particular crops. Additional objectives were to obtain residue and efficacy data for parsley (Petroselinum crispum), a crop for which there are no registered fungicides; and to facilitate comparison of residue levels for crops which would likely be included in a common grouping. Field studies were conducted during spring 1994 at the Everglades Research and Education Center in Belle Glade. The maximum labelled rate, the maximum number of applications, and the minimum preharvest interval were utilized. Residue levels of maneb and its biodegradation byproduct, ethylene thiourea (ETU), were determined for produce taken directly from the field and for produce which was washed in a manner consistent with cons

umer treatment. Residue levels on all 3 crops were well within the established tolerance of 10 p.p.m. for maneb, regardless of postharvest handling. Additionally, ETU levels did not exceed 0.03 p.p.m. on any unwashed tissue samples, indicating that ETU levels, given present-day toxicological risk assessments, should not be a safety concern on these crops. Relative differences among the crops and between trimmed and untrimmed samples suggest that parameters such as crop canopy architecture and fungicide mode of action should be considered in the establishment of crop groupings. The results also demonstrate the impact of postharvest washing and trimming, emphasizing the importance of the consumer's role in improving the safety of our food supply.