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Posted 3 Feb 09

See also Imidacloprid 'Guttation' presentation

The corn drops of dew ... poisoned with systemic insecticides!
(21 January 2009)

Mieli D'Italia

The bee is different from other insects to thermoregulation, which allows it to live at different latitudes. The importance of water collection allows it to perfectly maintain even temperature and humidity in the beehive. Among the sources for water in agriculture, in drops, like dew and "guttation" exudation from plants. Man has nothing better to do than to sow crops abundant with micro-contaminated and deadly poisonous pesticides.

At a conference in Legnaro, organized by Veneto Agricoltura and the title "Forum fitoiatrici autunnali ", has recently revealed a new route of exposure the neonicotinoid insecticides, used in coating of the seeds.  So far there has been limited research in the problem in the dispersion neonicotinoid at sowing (maize) and the pollution of their nectar and pollen because of their systemic action.

Professor Vincenzo Girolami at the conference Legnaro submitted a report and a movie on a hitherto not considered exposure via the guttation, or drops of water exudation from the leaves of young maize plants (as well as of other plant species) in abundance under conditions of good moisture, heat and water rich soil. Drops of water that the bees can easily collect by insects !

 Professor Vincenzo Girolami has shown that guttation of plants obtained from maize seeds, treated with neonicotinoid insecticides, if they are drunk by the bees are killed within 2-10 minutes, and within 20-40 minutes, if only sampled for a moment by the tongue.  Professor A. Tapparo, Department of Chemistry, University of Padova, has analyzed the drops of water produced by the planting of corn with guttation, found the presence of neonicotinoid at a rate of ten milligrams per litre (The measurement used is expressed in milligrams per litre or ppm-parts per million - where it is well known that the lethal dose for the bee is measured in a few, infinitesimal, ppb - parts per billion). Just remember that the solutions used for treatments containing insecticides in one hundred grams per litre, which have a content neonicotinoid only 5-10 times more concentrated in guttation.  Dramatic, especially considering both the nature of diffusion in guttation and its importance for many plants, is the remarkable persistence in the soil of these molecules, with a consequent risk that could also "pollute" crops in succession.

Samples of the Canadian government demonstrate what is meant when we talk about persistent molecules: imidacloprid (Gaucho) has a DT 50 (half-life) varying from 1 to 2 years depending on the type of soil, the clothianidin (Poncho) has a DT of 50 of 1386 days in North Dakota,  but 775 days in Saskatchewan, it was still 80% of the initial quantity, and Fipronil in the silty sand State of Washington, has shown a TD 50 of 7.3 months.

What conclusion? Perhaps it is time to simply acknowledge that the problem is not resolved with the change of seeders and even with improved techniques of seed coating (e.g. improving the adhesiveness of coating to suit) because of the plant guttation and those that are grown in their turn make available to process, "drops of blood " poisoned by large quantities of active ingredient. This is a demonstration of the superficiality with which they were granted permits of use of these molecules such as seed coating.

Guttation:lethal pearls of spring, di Vincenzo Girolami (pdf 1,5 Mb)

Video research guttation:lethal pearls of spring (format wmv 2,57 minutes)

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