Dissipation kinetics of flubendiamide and thiacloprid on tomato (Lycopersicon esculentum Mill) and soil

Abstract

Introduction Flubendiamide, a phthalic acid diamide widely used against the lepidopteran pests and thiacloprid, the first chloronicotinyl insecticide quite effective against the sucking insects, white flies and jassids have recently been used on various vegetable crops in India. Objectives Studies on dissipation kinetics of insecticides is very essential to work out their half‐ lives and waiting periods for the safe consumption of agricultural produce. Methods Standardized methodology supported by recovery studies is adopted to estimate residues of flubendiamide and thiacloprid on tomato. Final estimation of residues was accomplished using high performance liquid chromatography by employing C18 column and photo diode array at 230 wavelength. Results Half‐lives values for flubendiamide following its three applications at 10 days intervals @ 48 g a.i. ha−1 were observed to be 0.33 and 1.00 days, respectively. Similarly, at the same application rate these values for thiacloprid were found to be 1.18 and 0.95 days, respectively. Flubendiamide and thiacloprid residues were observed to dissipate below their determination limit of 0.01 mg kg−1 after 3 and 5 days, respectively, when applied @ 48 g a.i.ha−1. Soil samples collected after 15 days did not show the presence of flubendiamide, desiodo flubendiamide, and thiacloprid at their determination limit of 0.01 mg kg−1. Conclusion A waiting period of 5 days is recommended for safe consumption of tomato fruit after application of combination formulation of flubendiamide 24%+thiacloprid 24% (480 SC) @ 200 g ha−1.

Dissipation of flubendiamide in/on Brinjal (Solanum melongena) fruits

“…1). Kooner et al (2010) reported half lives of 0.33 and 1.0 day for flubendiamide in/on tomato when used at 48 g a.i. ha −1 .…”

Dissipation pattern of flubendiamide in/on brinjal (Solanum melongena L.)

“…However, the residues of flubendiamide dissipated below LOQ of 0.01 mgkg −1 after 3 and 5 days following three applications of combination mixture (flubendiamide 24% + thiacloprid 24%) 480 SC (w/v) at 48 and 96 g a.i. ha −1 on tomato and half-life values were found to range from 0.33 to 1.00 days (Kooner et al 2010). Desiodo flubendiamide was not detected in brinjal and soil at any time during the study period.…”

Influence of compost of sewage sludge and low-quality water on pesticide uptake by tomato plants grown in an iron mine soil

“…The concentration of FEN fell between 32 and 33 %, indicating a much faster metabolism in tomato for THC than for FEN. Previous studies with tomato established THC half-life in 2-7 days (Omirou et al 2009;Kooner et al 2010;Sharma and Parihar 2013), while in cabbage it ranged between 1.3 and 1.6 days (Wang et al 2011) and in eggplant the t 1/2 raised to 11-12 days, being dissipation rate independent of the applied dose (Saimandir et al 2009). Residues of FEN in tomato were not detectable after 3 or 7 days (Cabras et al 1985;Cabizza et al 2012) pointing to a rapid degradation rate, which is not in accordance with our results.…”

“…The pesticides were selected for two main reasons such that: a) they display different physicochemical characteristics, which will allow us to derive the plant uptake behaviour of organic pollutants within a broad range of properties and b) these compounds are currently used to control pests in tomato cultivation. The insecticide THC belongs to the neonicotinoid family with wide activity range including sucking insects, weevils, leaf miners and various beetle species, showing good compatibility in relevant crops (Elbert et al 2001;Omirou et al 2009;Kooner et al 2010). Fenarimol, a systemic fungicide from the group of substituted pyrimidines, is used in ornamental and horticultural crops, like tomato, in the control of powdery mildew, dollar spot, snow mould and brown patch (Cabras et al 1985;Cabizza et al 2012).…”