Abstract
In this study, the safety and risk of fosthiazate as a nematicide against root-knot nematode in tomato and cherry tomato were evaluated. The dissipation and residue of fosthiazate for 28 days in tomatoes and cherry tomatoes were determined and studied by HPLC after simple, rapid pre-treatment. The mean recovery was 83.79~94.18%, and the relative standard deviations were 3.97~7.40%. Results showed that the half-lives of fosthiazate in tomatoes (4.81~5.37 days) were significantly lower than that in cherry tomatoes (5.25~5.73 days). At the pre-harvest interval (PHI) of 21 days, the residues of tomatoes and cherry tomatoes were 0.032~0.046 mg/kg, which were lower than the maximum residue level (MRL) established in China. The potential risks of fosthiazate exposure through the dietary intake of tomatoes and cherry tomatoes to different populations were also studied. According to the results of dietary risk assessment, the residual levels of fosthiazate were within the acceptable range of long-term dietary risk in different populations in China within the sampling interval of 21 days after the application of fosthiazate. Our results show that fosthiazate at 2250 g.a.i./ha in the field control of root-knot nematode has high safety and low risk, and can provide a reference for the safe and reasonable use of fosthiazate as a nematicide in the field.
Highlights
Tomato (Solanum lycopersicum L.) is a popular horticultural product in the world, and China is one of the main producers (Coyago-Cruz et al, 2019; Coyago-Cruz et al, 2018)
It was confirmed that the limit of quantitation (LOQ) was significantly lower than the maximum residue level (MRL) developed by the Ministry of Agriculture of China
Based on the terminal residue results, we evaluated the potential risk of fosthiazate exposure through the dietary intake of tomato and cherry tomato to different populations
Summary
Tomato (Solanum lycopersicum L.) is a popular horticultural product in the world, and China is one of the main producers (Coyago-Cruz et al, 2019; Coyago-Cruz et al, 2018). Tomatoes are infected by root-knot nematode (Meloidogyne spp.), which cause major economic damage to crops like tomatoes around the world (Chen et al, 2007). After infection, it will seriously affect the absorption of water and nutrients of the plant, and interfere with the transport of minerals and photosynthetic products in the host, resulting in plant wilting and stunted growth with significantly reduced yield (Milligan et al, 1998). It makes the host plant more susceptible to other soil-borne pathogens, usually bacteria and fungi (Williamson & Gleason, 2003)
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