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Piesma quadratum is the only vector of beet leaf curl - virosis affecting sugar beet. The sugar content of beets infected by beet leaf curl is reduced by an average of 9% and the root weight is decreased by an average of 58.4%. P. quadratum appeared in Poland in the beginning of this century after migration from the territory of Germany. This bug has one generation a year. lts occurrence is characterised...
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