Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 4 de 4
Filter
Add more filters










Database
Language
Publication year range
1.
J Environ Sci Health B ; 49(9): 671-8, 2014.
Article in English | MEDLINE | ID: mdl-25035916

ABSTRACT

The behavior of 28 pesticides on two tomato cultivars with a different surface/weight (S/W) ratio of the berries (S/W, Birikino vs. Tombola) was studied, in order to provide appropriate indications about their persistence on crops reaching the pre-harvest interval (PHI). Quantitative analysis was performed using a GC MS/MS method. Birikino cv. (BIR) was a "cherry type tomato" with a double S/W ratio compared with Tombola cv. (TOM). The results showed a different pesticide behavior. Azoxystrobin, Boscalid, Bupirimate, Difenoconazole, Etofenprox, Iprodione, Mepanipyrim, Myclobutanil, Tebuconazole, Zoxamide, Metalaxyl M, Pyrimethanil, Tetraconazole, Benalaxyl, Cyprodinil, Fenamidone, Famoxadone and Fludioxonil immediately after treatments showed residues on BIR higher than TOM, and this behavior is consistent with its greater exposed surface. BIR showed higher decay rates of these pesticides during the whole trial, nevertheless residue averages remained higher than TOM reaching the time of harvest. Residues at the PHI were all below their Maximum Residue Levels (MRLs), but data indicated that they could exceed their legal limits especially if the above-mentioned active ingredients were employed more than once per crop cycle on cherry type tomatoes. As regards to Chlorpyrifos, Chlorpyrifos methyl, Triadimenol, Pyridaben and Tebufenpyrad, no different residual behavior related to S/W ratio of the cultivars was observed. Even in this case, residues at the PHI were all below MRLs. As for Cyfluthrin, Deltamethrin, Lambda cyhalothrin, Etoxazole and Cyproconazole, residues were lower than the limit of quantitation (LOQ) of the analytical method just after the treatment, according to their low doses of employment.


Subject(s)
Fungicides, Industrial/analysis , Gas Chromatography-Mass Spectrometry , Hazard Analysis and Critical Control Points/methods , Pesticide Residues/analysis , Solanum lycopersicum , Tandem Mass Spectrometry , Food Contamination/analysis , Fruit/physiology , Solanum lycopersicum/physiology
2.
J Environ Sci Health B ; 47(5): 379-84, 2012.
Article in English | MEDLINE | ID: mdl-22424061

ABSTRACT

The degradation of 12 fungicides (azoxystrobin, cymoxanil, cyproconazole, cyprodinil, fenarimol, fludioxonil, iprovalicarb, mepanipyrim, penconazole, pyrimethanil, tolclofos-methyl, triadimenol), commonly used in pest management strategies on Sardinian greenhouse tomato crops was studied. A different residue behaviour was observed between the studied cultivar. On the smaller, a "cherry" type tomato, field data showed an initial residue mostly higher than the "beefsteak" tomato. In any case, except for penconazole, all pesticide residues were below their maximum residue levels (MRLs) reaching the pre-harvest interval (PHI). On both cultivar, triadimenol and cymoxanil residues completely disappeared reaching their PHI, while iprovalicarb, fenarimol, and fludioxonil disappeared in a time of 17 to 24 days. On the contrary, azoxystrobin, cyproconazole, cyprodinil, penconazole, tolclofos-methyl, mepanipyrim, and pyrimethanil showed a long persistence on both tested cultivar and may have residual problems due to an accumulation effect if repeated field treatments will be performed. The first group of molecules according to their rapid degradation could be used in low pesticide-input management in order to obtain tomatoes with low or no detectable residues.


Subject(s)
Fungicides, Industrial/chemistry , Pesticide Residues/chemistry , Solanum lycopersicum/growth & development , Food Contamination/analysis , Fruit/chemistry , Fruit/drug effects , Fruit/growth & development , Fungicides, Industrial/pharmacology , Solanum lycopersicum/chemistry , Solanum lycopersicum/drug effects , Pesticide Residues/pharmacology
3.
J Environ Sci Health B ; 42(7): 761-6, 2007.
Article in English | MEDLINE | ID: mdl-17763031

ABSTRACT

Degradation of two fungicides (cyprodinil and fludioxonil) and two insecticides (cyfluthrin and pymetrozine) applied on iceberg and romaine lettuce under field conditions with different methods (portable mistblower and chemigation) was studied field data showed that both distribution methods and lettuce cultivar affect the degradation trends of examined pesticides. In these trials the residues of all active ingredients after pre-harvest time were less than fifty's maximum residue levels; the values in the romaine cultivar were generally higher than those in iceberg lettuce. After pre-harvest time residues of pesticides applied on romaine lettuce by portable motor sprayer were always higher than those obtained by the chemigation system.


Subject(s)
Food Contamination/analysis , Fungicides, Industrial/analysis , Insecticides/analysis , Lactuca/chemistry , Pesticide Residues/analysis , Dioxoles/administration & dosage , Dioxoles/analysis , Fungicides, Industrial/administration & dosage , Insecticides/administration & dosage , Nitriles/administration & dosage , Nitriles/analysis , Pyrethrins/administration & dosage , Pyrethrins/analysis , Pyrimidines/administration & dosage , Pyrimidines/analysis , Pyrroles/administration & dosage , Pyrroles/analysis , Time Factors , Triazines/administration & dosage , Triazines/analysis
4.
J Agric Food Chem ; 51(4): 1030-4, 2003 Feb 12.
Article in English | MEDLINE | ID: mdl-12568568

ABSTRACT

The chemical composition of the essential oil of the Sardinian dwarf curry plant [Helichrysum italicum G. Don ssp. microphyllum (Willd) Nym] was studied. Genetic analysis suggested the presence of two chemotypes; morphological and chemical differences confirmed the presence of two chemotypes (A and B). The maximum yields were 0.18 and 0.04% (v/w) for flowering tops and stems, respectively. The concentrations of nerol and its esters (acetate and propionate), limonene, and linalool reach their highest values during the flowering stage both in flowers and in stems. Besides the essential oil, type B showed an interesting antifungal activity.


Subject(s)
Fungicides, Industrial/pharmacology , Helichrysum/chemistry , Helichrysum/genetics , Oils, Volatile/chemistry , Oils, Volatile/pharmacology , Acyclic Monoterpenes , Cyclohexenes , Flowers/chemistry , Helichrysum/growth & development , Limonene , Monoterpenes/analysis , Plant Oils/chemistry , Plant Oils/pharmacology , Plant Stems/chemistry , Terpenes/analysis
SELECTION OF CITATIONS
SEARCH DETAIL
...