Meptyldinocap and azoxystrobin residue behaviors in different ecosystems under open field conditions and distribution on processed cucumber

Abstract

BACKGROUND Several diseases and insects may cause damage to the normal growth of cucumber. Azoxystrobin and meptyldinocap, because of their novel mode of action, are effective against pathogens that have developed reduced sensitivity to other fungicides. Azoxystrobin is persistent in various crops and environments. However, there is a lack of research on the dissipation of these two pesticides, especially meptyldinocap. RESULTS Analytes could be quantified with decent recoveries of 90–101%, with relative standard deviations (RSDs) of 3.0–10.1%. The terminal residues of meptyldinocap and azoxystrobin in cucumber were all < limit of quantification (LOQ) (0.02 and 0.05 mg kg−1). The half‐lives of meptyldinocap and azoxystrobin were 0.8–1.1 and 1.2–2.8 days, respectively. The processing factors (PFs) for washing were all < 1, but the removal rate for washing was < 29.0%. Peeling had a significant effect on the removal of pesticide. The largest residue reductions were noticed through the pickling process, but special care should be taken regarding residues in the pickling solution as pesticides could transfer to them from cucumber. A more interesting finding was that the degradation of two pesticides was accelerated by the addition of calcium oxide. CONCLUSION Pesticide residues on cucumber decreased after these processes. These results enable the health‐risks from dietary exposures to pesticide residues to be characterized. They enable maximum residue limits (MRLs) to be established for pesticide residues in food products. They also assist the optimization of food processing with regard to pesticide residue dissipation. © 2019 Society of Chemical Industry

Dissipation and residue determination of fluopyram and its metabolites in greenhouse crops

“…Tomato (Solanum lycopersicum) and cucumber (Cucumis sativus) are two of the most important horticultural crops in the world [1][2][3] and a fundamental part of the Mediterranean diet. Spain is Europe's second greatest tomato producer and the third greatest cucumber producer, with an average yield of 4.8 × 10 6 t yr -1 and 643 × 10 3 t yr −1 , respectively.…”

“…A powdery mildew, also named Oidium (caused by Sphaerotheca fuliginea fungi and Erysiphe cichoracearum fungi), is the disease that causes major crop losses in cucumber and tomato worldwide. 2,5,6 In soilless crops, pathogens can be conserved in the substrates or in the roots that are embedded in the picks from previous crops. 7 Fluopyram 8 (N-{2-[3-chloro-5-(trifluoromethyl)pyridin-2-yl]ethyl}-2-(trifluoromethyl)benzamide) is a new systemic fungicidal compound present as the lone active ingredient in the Velum-Prime® plant protection product (PPP), which is very effective against Oidium pest.…”

Thermal Degradation of Conventional and Nanoencapsulated Azoxystrobin due to Processing in Water, Spiked Strawberry, and Incurred Strawberry Models

“…This present study investigated the thermal degradation of AZOX from simple matrices to more complex matrices, and from laboratory control samples to “real” samples. This study contributes to reduce the knowledage gaps related to AZOX dissipation in food . AZOX degradation for both the conventional and nanoencapsulated formulations followed first-order kinetics when heated at 100 °C in the water.…”

“…This study contributes to reduce the knowledage gaps related to AZOX dissipation in food. 45 AZOX degradation for both the conventional and nanoencapsulated formulations followed first-order kinetics when heated at 100 °C in the water. Different TDPs were identified in water, spiked, and incurred strawberries.…”

Increasing the activities of protective enzymes is an important strategy to improve resistance in cucumber to powdery mildew disease and melon aphid under different infection/infestation patterns

“…Cucumber ( Cucumis sativa L.) is a worldwide economic crop, and greenhouse culture can maintain cucumber production throughout the year. Cucumber production is often affected by a phytophagous insects and pathogenic microorganisms, resulting in a reduction in the yield of cucumber fruits ( Bagi et al, 2014 ; Bian et al, 2020 ). In greenhouses and fields, powdery mildew disease caused by Sphaerotheca fuliginea (Schlecht.)…”