Study on the efficacy of imidacloprid and fipronil used as seed dressing in controlling wireworms [Beta vulgaris L. - Emilia-Romagna - Veneto]
2002
Furlan, L. (Padua Univ. (Italy). Dipartimento di Agronomia Ambientale e Produzioni Vegetali) | Campagna, G. (COPROB s.c.r.l., Minerbio, Bologna (Italy))
Several trials were conducted in Veneto and Emilia-Romagna using wireworms (Agriotes brevis, Agriotes ustulatus) put, at different times, in pots filled with clay loam soil and planted with sugar beet, in order to evaluate the effectiveness of new insecticides used as seed dressing (imidacloprid and fipronil). Both the insecticides proved to be effective in protecting the seedlings for about 15 and 30 days in most cases. Early in the season fipronil proved to be slightly less effective in protecting seedlings, due to the fact that part of the larvae died after they had fed on the seedlings. The two active ingredients caused very different larval mortalities: imidacloprid killed very few larvae (the number of alive larvae usually did not differ significantly between imidacloprid and the untreated pots), while most of the larvae were found dead or moribund in the pots with seeds dressed with fipronil, particularly at the highest dosage of 25 g of a.i. per 100,000 seeds. The association between imidacloprid (45 g of a.i. per 100.000 seeds) and fipronil (15 g of a.i. per 100.000 seeds) caused the same larval mortality and plant protection as fipronil at the dosage of 25 g of a.i. per 100,000 seeds
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