Verlag des Forschungszentrums Jülich
JUEL-2847
Stein-Dönecke, Ulrike
Beizhofausbildung, Aufnahme, Translokation und Wirkung von (14C)Imidacloprid bei Winterweizen und Zuckerrüben nach Saatgutbehandlung und unter dem Einfluß verschiedener Bodenfeuchten
195 S., 1993
Dressing zone formation, uptake, translocation and action of [14C]imidacloprid with
winter wheat and sugar beet after seed treatment and under the influence of various of
soil moisture levels
Seeds are treated with insecticides to provide the developing plant with a comprehensive and
long-lasting protection against insect pests living in the soil and aboveground. Various conditions
must be fulfilled in order to achieve this goal. Whereas ideal protection against soil insects is
given by a contact action of the insecticide, for protection of the plant organs aboveground
systemic active ingredients are required, which after uptake and translocation in the plant act as
a stomach insecticide. For long-term protection, it is necessary that the active ingredient should
be present in the soil for a considerable period and in sufficient concentrations close to the plant
organs to be protected and it should be available both for action against soil insects as well as
for uptake into the plant. Furthermore, the insecticide should display a broad range of activity, an
adequate safety margin between the effective and phytotoxic dose at the seed grain and also
good compatibility with other substances such as fungicides, pelleting material etc. It must be
ensured that birds are not endangered by eating treated seeds either by a low bird toxicity or a
clear repellent effect (Graham-Bryce, 1973; Hewett and Griffiths, 1986).
In comparison to other methods of active ingredient application, seed treatment has ecological
and economic advantages. For example, seed treatment is not dependent on weather conditions
and applies the active ingredient directly at the location of action. Apart from the possibility of
reducing the amount of active ingredient applied per area, this also means only slight contact
between the active ingredient and the environment. Furthermore, increasing the duration of
action by seed treatment means that post-emergence treatments can be reduced.
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