This study was initiated in order to study cultural practices and assess levels of contamination in pesticide residues of onion samples produced in the region of Boucle du Mouhoun, Burkina Faso. A collection of samples was carried out at three gardening sites. A survey was also carried out to list the various pesticides used on market gardening sites and the practices for using pesticides. The QuEChERS method allowed the quantification of pesticides. The results show that 93% of the market gardeners were men, and more than 67% were between 25 and 35 years old. Nearly 55% of market gardeners are illiterate and do not have adequate means of protection when applying pesticides. A total of 16 pesticides have been accounted and most of them are Category II which are dangerous for human health and environment. 12 pesticide residues were quantified. Most of the active substances detected above the MRL (set by Codex Alimentarius and EU) were from the organochlorine family. These results reveal a fairly high level of contamination for pesticide residues. The study revealed that cultivation practices in market gardening sites as well as the consumption of onion pose numerous health risks for humans and the environment.
The present study consisted of evaluation of cultural practices and pesticides contamination level of tomato in some gardening sites in the region of Boucle du Mouhoun (Burkina Faso). A survey of phytosanitary practices among 30 producers was carried out at the Di and Dedougou sites. The pesticide contamination level of tomatoes collected was determined by the QuEChERS method. The survey revealed a low level of literacy among producers (60%), an increased use of pesticides without adequate protection materials, non-compliance with prescribed doses, use of unregistered pesticides (28%) and poor management of packaging. Chromatophic analysis of the samples detected 16 active substances predominantly organophosphorus (62%). 62.5% of detected compounds (Omethoate, Parathion methyl, Diazinon, Methydathion, Pyridaphethion, Pyrimiphos methyl, Alachlor, 2.4 DDT, lindane, permethrin and Imazalil) are not authorized by the CSP. Among authorized compounds, Dimethoate, Malathion, and Cypermetrin contamination levels higher than the MRLs have been observed. These results confirmed risks of environment contamination and sanitary of farmers and consumers linked to their exposure and consumption of tomatoes. Measures should be taken to raise awareness among market gardeners of good pesticide use practices and the adoption of alternative methods to pesticides to protect environment, gardeners and consumers health.
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