Acephate and methamidophos residues in greenhouse and in field grown tomatoes

Abstract

Increasing horticultural production under protected cultivation requires more detailed studies about the occurence of pesticide residues, due to the special and peculiar environment under controlled conditions, in which some pests, that are of little concern in the field, become important. The insecticide acephate and its methamidophos metabolite residues were evaluated in greenhouse-grown tomatoes and compared to an open-field tomato crop. The treatments: (a) check; (b) one application of 75 g a.i. acephate.100 L-1 water; (c) one application of 150 g a.i.100 L-1 water; (d) four applications of 75 g a.i.100 L-1 water were evaluated. Fruit, leaf and soil samples were taken at (-1), zero, 1, 3, 7, 14, 21 days after the last or only application. The quantitative determinations were done by gas chromatography, using flame-photometric detector. The acephate and methamidophos residues in fruits harvested in the greenhouse and in the field were always below their respective maximum residue levels (MRL) during the whole sampling period. The metabolism of acephate into methamidophos was very low in fruits, especially important in leaves, but not well characterized in soil. Acephate residues were higher in the greenhouse than in the field, especially in leaves and soil, showing stability and persistence up to the 7-day-sampling after application.

Residues of pesticides acephate and methamidophos in capsicum grown in greenhouse and open field

“…This is in conformation to the results obtained in the present study. Acephate and methamidophos residues were also evaluated in greenhouse‐grown tomatoes and compared to an OF tomato crop (Trevisan et al ., ). The metabolism of acephate into methamidophos was found to be very low in tomato fruits but important in leaves and not well characterized in soil.…”

Organophosphorous compounds and oxidative stress: a review

“…Acephate (O, S-dimethyl acetyl phosphoramidothioate), is an OP foliar spray insecticide (Trevizan, Baptista, and Papa 2005) of moderate persistence with residual systemic activity of approximately 10À15 days at the recommended use rate. It is used for control of a wide range of biting and sucking insects, especially aphids, including resistant species, in fruits, vegetables (e.g.…”

Altered differential hemocyte count in 3rd instar larvae of Drosophila melanogaster as a response to chronic exposure of Acephate

“…Not only that, its acute exposure (for 12 and 24 hours) was seen to alter differential hemocyte count (Rajak et al ., 2014 ). Presence of Acephate residues has been reported in edible parts of some vegetables and fruits (Trevizan et al ., 2005 ). Non target consumers feeding on them are thus frequently undergoing chronic exposure to such chemicals.…”