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Sat, 23 Feb 2002 18:54:41 +0100 |
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hello
spero che questa ricerca sia utile anche a voi.
giuseppe caboni
Adult female Varroa jacobsoni mites were sampled in the province of Reggio
Emilia (Northern Italy), where field trials had shown a decreased efficacy
of Perizin in some apiaries, and assayed for resistance to coumaphos by
using a laboratory test. In some samples, the tolerance at 20 ppm coumaphos
was significantly larger than that observed in a reference susceptible population;
1.5% mites of the mites assayed at 50 ppm survived (expected survival in
a susceptible population ~ 0.1%), but all the 430 mites assayed at 100-500
ppm died.
These data show an increase in the tolerance to coumaphos at least in some
apiaries, but do not make it possible to conclude that a small proportion
of highly resistant mites is present.
Giorgio Della Vedova*,Marco Lodesani**,Norberto Milani*
la tesi completa la potete trovare a :http://www.apicolturaonline.it/milani.htm
buon lavoro a tutti
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