Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 525611
Title Persistence of DDT and parathion residues on a plant surface as influenced by weather factors
Author(s) Fahmy, H.S.M.
Source University. Promotor(en): J. de Wilde. - Wageningen : Veenman - 64
Department(s) Laboratory of Entomology
Publication type Dissertation, internally prepared
Publication year 1961
Keyword(s) gewasbescherming - insecticiden - acariciden - mollusciciden - toxicologie - pesticiden - pesticidenresiduen - persistentie - plant protection - insecticides - acaricides - molluscicides - toxicology - pesticides - pesticide residues - persistence
Categories Chemical Control / Environmental Toxicology, Ecotoxicology
Abstract The decay of DDT and parathion deposits under the influence of temperature, rain and ultraviolet radiation was described. Temperature and solar radiation were the main factors limiting the residual effect. High mean temperatures were more important than high maxima.

DDT residues were more persistent than parathion residues. A fraction of the parathion residue persisted for many days indicating the presence of parathion inside leaf tissues.

In the laboratory at high temperatures losses mainly occurred within the initial period of exposure; at moderate temperatures initial losses were much less but continued at a higher level over a longer period. Parathion residues were more temperature-sensitive than DDT residues.

DDT deposits showed a linear decrease with rain; the parathion residues decreased geometrically at first, then slowly. Losses were not proportional to rainfall.

Ultraviolet radiation was very effective in reducing the DDT and the parathion residue within a few hours. Moistening generally had a protective effect against radiation.

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