Residue Dynamics and Risk Assessment of Trifloxystrobin and Tebuconazole on Tomato (<i>Lycopersicon esculentum</i> Mill.)

Abstract

The study was undertaken to determine the dissipation kinetics of trifloxystrobin and tebuconazole residues on tomato under field conditions and thereby to ensure consumer safety. Three applications of a combination formulation, Nativo 75 WG (trifloxystrobin 25% + tebuconazole 50%) were made @ 350 and 700 g ha-1 at 7 days intervals. Tomato samples were collected at 0 (1 hr), 1, 3, 5, 7, 10 and 15 days after the last application. The average initial deposits of trifloxystrobin on tomato fruits were found to be 0.40 and 0.76 mg kg-1, and that of tebuconazole were 1.56 and 2.76 mg kg-1, at single and double dose, respectively. Half life of trifloxystrobin were observed to be 1.39 and 1.94 days, at single and double doses, respectively, whereas with respect to tebuconazole, these values were 0.93 and 0.78 days. Soil samples collected after 15 days did not reveal the presence of trifloxystrobin, its metabolite CGA321113 and tebuconazole at their detection limit of 0.05 mg kg-1. Theoretical maximum residues contribution (TMRC) for trifloxystrobin and tebuconazole were calculated and found to be well below maximum permissible intake (MPI) on tomato at 0-day (1 hr after spraying) for the both the test doses. Thus, the application of combination formulation Nativo 75 WG (trifloxystrobin 25% + tebuconazole 50%) at the recommended dose on tomato did not seem to pose any human health risk.

Persistence, dissipation behavior and health risk assessment of spiromesifen in brinjal (Solanum melongena L.) by LC-MS/MS

“…The dissipation of spiromesifen in brinjal was calculated by using Single First Order dissipation model using the equation Ct=C0e -kt , Where Ct is insecticide concentration at time t, C0 is initial concentration, k is the rate constant. The residues data were subjected to statistical analysis according to Hoskins (1961) to calculate the residual half-life (DT50) and pre-harvest interval (PHI) e.g. waiting period.…”

Levels of residues and dietary risk assessment of the fungicides myclobutanil, penconazole, tebuconazole, and triadimenol in squash

“…The equations for tebuconazole applied at 125 and 250 g.ai/ha were C t = 1.9134e -0.301x and C t = 3.1494e -0.312x , with respective halflives of 2.30 and 2.22 days. The dissipation half-lives of tebuconazole have previously been reported as 1.85-2.46 days in wheat leaves (Kaur et al, 2012), 5.48-6.93 days in watermelons (Dong & Hu, 2014), and 0.93-0.78 days in tomatoes (Singh & Singh, 2014).…”

“…), pesticide application method, plant uptake of the pesticide (via leaves, stem, or roots), and properties of the pesticide (Abdallah, El Agamy, et al, 2019;Abdallah, El-Hamid, & Raheem, 2019;Abdallah & Malhat, 2020). The dissipation behavior of myclobutanil, penconazole, triadimenol, and tebuconazole has been investigated individually in various crops under specific climate conditions and cultivation techniques (Abd-Alrahman & Ahmed, 2012;Abd-Alrahman & Ahmed, 2013;Abdella et al, 2015;Cui et al, 2011;Deng et al, 2010;Dong et al, 2010;Dong & Hu, 2014;Dubey et al, 2020;Hassan et al, 2013;Heshmati et al, 2020;Kaur et al, 2012;Liu et al, 2009;Liu et al, 2012;Lou et al, 2008;Lucini & Molinari, 2009;Matadha et al, 2019;Romeh et al, 2009;Saidi et al, 2017;Singh & Singh, 2014). For example, tebuconazole was previously determined in peach, palm, apricot, and nectarine crops, and hexaconazole, myclobutanil, and tebuconazole were determined in apples and soil using a solid-phase extraction (SPE) cleanup procedure followed by GC coupled to a nitrogen phosphorous detector (Deng et al, 2010;Lucini & Molinari, 2009).…”

Dissipation of Fluopyram and Tebuconazole Residues in/on Pomegranate and Soil in Western Maharashtra

“…was studied in chilli [7], onion [8] and watermelon [9] and tebuconazole alone applied in/on onion [10] [11], mango [12], ginseng [13], chilli [14], tomato [15] and apple [16].…”