Pyrethroid insecticide residues on vegetable crops

Abstract

Pyrethroid insecticides were applied on various vegetable crops as foliar treatments to determine dissipation rates. On Chinese broccoli (Guy Lon), Chinese mustard (Pak Choi) and Chinese cabbage (Kasumi, napa), fenvalerate was persistent with residues of 0.10, 0.14 and 0.11 mg kg-1, respectively, by day 21. Cypermethrin residues on head lettuce were below 0.1 mg kg-1 by day 10 but on the leafier romaine and endive varieties it was more persistent and required 14-19 days to dissipate below this concentration. After three applications, residues of cypermethrin in harvested carrots and of permethrin in eggplant were not detected on the day of application. On asparagus, deltamethrin and cypermethrin residues declined to less than 0.1 mg kg-1 by days 1 and 2, respectively; permethrin was more persistent, requiring more than 2 days to decline to less than 0.1 mg kg-1. Deltamethrin on dry (cooking) and Spanish onions was not detected on the day of application. On tomatoes, the concentration of permethrin was 0.093 mg kg-1 on the day of application and declined to about 0.05 mg kg-1 after 2-4 days. In general, permethrin, cypermethrin and deltamethrin residues declined to acceptable concentrations within an acceptable pre-harvest interval. Fenvalerate may be too persistent on these speciality crops unless a maximum residue limit > 0.1 mg kg-1 is permitted.

Extraction of Multi-Class Pesticide Residues in Mango Fruits (Mangiferae indica L.): Application of Pesticide Residues in Monitoring of Mangoes

“…However, for fruits like apple, dry slurry with Florisil was able to yield efficient recoveries (Nakamura et al 1993). Reports of column clean up using mini columns as used in this method were used for multi-residue analysis in vegetables (Ripley et al 2001).…”

Residue level and dissipation pattern of spiromesifen in cabbage and soil from 2-year field study

“…Pesticides applied to cabbage may remain within the leaves due to its multilayered structure. These pesticides can persist on cabbage for long period of time as they are not affected by the environmental conditions (Abo-El-Seoud et al 1995;Ripley et al 2001). When pesticide residues were monitored on different vegetable crops, the maximum residues were detected in cabbage (Srivastava et al 2011;Lozowicka et al 2012).…”

Effets d’extrait hydroéthanolique de feuilles de neem (<i>Azadirachta indica</i> A. Juss) sur <i>Plutella xylostella</i> (Lepidoptera : Plutellidae) et <i>Lipaphis erysimi</i> (Hemiptera : Aphididae) dans la production du chou au Sud du Togo

“…Ils sont biodégradables et sélectifs (Cloyd, 2004). Ces caractéristiques permettent de résoudre les problèmes de résidus posés par les pesticides de synthèse (Ripley et al, 2001 ;Tano et al, 2011) souvent à l'origine de l'intoxication alimentaire. Plusieurs études ont montré que les graines de neem (Azadirachta indica A. Juss) contenaient une quantité élevée d'azadirachtine, composé régulateur de la dynamique des insectes ravageurs des cultures (Wondafrash et al, 2012).…”