Search results for "PEST"

Direct and indirect exogenous contamination by pesticides of rice-farming soils in a Mediterranean wetland.

2003

It is known that the sources of soil contamination can be endogenous or exogenous and that exogenous contamination may be direct or indirect. In this work, an environmental pesticide fate study was conducted in soil profiles collected from 23 rice field sites in an important Mediterranean wetland (Albufera Natural Park, Valencia, Spain) from April 1996 to November 1997. Temporal and spatial distribution of 44 pesticide residues in an alluvial Mediterranean soil (gleyic-calcaric Fluvisol, Fluvaquent) were monitored. During this period, the levels of pesticide residues in different soil horizons (Ap1 0–12 cm, Ap2 12–30 cm, ApCg 30–50 cm, C1gr 50–76 cm, and C2r 76–100 cm) were investigated. In…

Effects of the ingestion ofSerratula tinctoria extracts, a plant containing phytoecdysteroids, on the development of the vineyard pestLobesia botrana…

1997

We describe here the effects of extracts from Serratula tinctoria, a plant producing phytoecdysteroids, on the growth and development of Lobesia botrana, an economically important pest in vineyards. Leaves, hairy roots, or semi-purified (by Sep-Pak procedure) methanolic extracts from this plant were incorporated into an artificial diet given to insects. Larval growth, mortality, weight, and sex-ratio were investigated, as well as sterol and ecdysteroid contents. Experimental diets induced an important mortality in the first, second, and third larval instars, but also in pupae. As males appeared more sensitive to extracts, sex ratio was significantly modified on experimental diets (particula…

Sensory adaptation of antennae and sex pheromone-mediated flight behavior in male oriental fruit moths (Leptidoptera: Tortricidae) after prolonged ex…

2013

Sensory adaptation has been measured in the antennae of male Grapholita molesta (Busck) after 15 min of exposure to its main pheromone compound (Z)-8-dodecen-1-yl acetate (Z8-12:OAc) at the aerial concentration of 1 ng/m(3) measured in orchards treated with pheromone for mating disruption. Exposing males to this aerial concentration of Z8-12:OAc for 15 min, however, had only a small effect on their ability to orientate by flight to virgin calling females in a flight tunnel. Experiments were undertaken to determine if exposure to the main pheromone compound in combination with the two biologically active minor compounds of this species, (E)-8-dodecen-1-yl acetate (E8-12:OAc) and (Z)-8-dodece…

Potential of the Bacillus thuringiensis Toxin Reservoir for the Control of Lobesia botrana (Lepidoptera: Tortricidae), a Major Pest of Grape Plants▿

2006

ABSTRACT The potential of Bacillus thuringiensis Cry proteins to control the grape pest Lobesia botrana was explored by testing first-instar larvae with Cry proteins belonging to the Cry1, Cry2, and Cry9 groups selected for their documented activities against Lepidoptera. Cry9Ca, a toxin from B. thuringiensis , was the protein most toxic to L. botrana larvae, followed in decreasing order by Cry2Ab, Cry1Ab, Cry2Aa, and Cry1Ia7, with 50% lethal concentration values of 0.09, 0.1, 1.4, 3.2, and 8.5 μg/ml of diet, respectively. In contrast, Cry1Fa and Cry1JA were not active at the assayed concentration (100 μg/ml). In vitro binding and competition experiments showed that none of the toxins teste…

Surveillance of pesticide residues in fruits from Valencia during twenty months (2004/05)

2010

Abstract The aim of this study was to investigate the pesticide residues in market fruits (oranges, tangerines, nectarines, peaches and khakis) from one Valencian Cooperative (Spain) and to conduct a monitoring of 32 organophosphorous, organonitrogen and organohalogenated pesticides and nine dithiocarbamate fungicides (DTCFs) usually applied on cultures of this area. Extracts were obtained by an official procedure for routine analysis based on ethyl acetate extraction. Residues of pesticides were determined by gas chromatography with nitrogen phosphorous detector (NPD), electron-capture detector (ECD) and mass spectrometry (MS) detectors. Mean recoveries obtained at fortification levels bet…

RESUME:Studies on the Chemical Control of Aonidiella aurantii (Mask.)

1974

Aonidiella aurantii (Mask.) which was accidentally introduced in Sicily in 1968 has since become a dangerous pest requesting special treatments in citrus groves. Experiments have been carried out on Citrus lemon to evaluate the efficacy of several organophosphorous compounds partly in mixture with white oil and this latter applied sole (cf. table 1). The results obtained against young females are set out in table 2; they show excellent results with almost all compounds whereas the same pesticides had a rather poor effect on mature females (cf. table 3). It is concluded that the replacement of white oils by organophosphorous compounds is not justified providing that the control is directed a…

‘My Language! Heavens!’: Strange Tongues and the Denial of Mimesis in The Tempest

2008

The Tempest est la dernière pièce « italienne » de Shakespeare. Cet article se penche sur quelques unes des conséquences poétiques et métaphysiques de la convention qui consiste à faire correspondre l’anglais de la pièce à l’italien que sont sensés parler les personnages. Nous montrerons que cette convention est un paramètre essentiel de l’action dramatique et qu’elle contribue à la mise en évidence du caractère fondamentalement « Autre » de la langue du théâtre. Dans The Tempest, l’imbrication d’une langue inconnue et d’une langue familière débouche par métonymie et par métaphore sur un déni du principe classique de mimesis.

Merla de pit blanc, Mirlo capiblanco (VER0000010)

1935

Altres noms vulgars: Ring Ouzel (Alpine) (Anglès), Merle à plastron (Alpes) (Francès), Ringdrossel-alpestris (Alemany) Gabinet de Vertebrats (Departament de Zoologia), Facultat de Ciències Biològiques (Campus de Burjassot), C/ Doctor Moliner, s/n, Bloque B. 5é plant, Burjassot (Valencia). Armari: 31-1 Llíria 1935 MachoHembra Adultos

Algunas precisiones sobre la técnica del grabado estriado en la Cova del Parpalló (Gandia, Valencia)

1986

Glifosāta un trimetilsulfonija katjona izplatība tējās

2022

Glifosāta un trimetilsulfonija katjona izplatība tējās. Grīnvalde J., darba vadītāja Ph.D. Ikkere L.E. Bakalaura darbs, 36 lapaspuses, 15 attēli, 12 tabulas, 36 literatūras avoti, 2 pielikumi. Latviešu valodā. Darbā apkopota pieejamā literatūra par dažādu veidu tēju iegūšanu no Camellia sinensis jeb tējas auga, to apstrādi, kā arī par pesticīdiem, glifosāta un trimetilsulfonija katjona noteikšanu un tā rašanos tējās, kā arī izplatību un ietekmi uz cilvēka veselību. Darbā tiek analizēti dažādi tējas paraugi, nosakot tajos glifosāta un trimetilsulfonija katjona koncentrācijas ar augsti efektīvo šķidrumu hromatogrāfiju apvienotu ar tandēma masspektometru un turboizsmidzināšanas interfeisu nega…