New method for monitoring the damages of Anthonomus rubi on raspberry | Nouvelle méthode de contrôle des dégâts de l'anthonome du framboisier
2012
Linder, Ch. | Baroffio, C. | Mittaz, Ch., Station de recherche Agroscope Changins-Waedenswil ACW, Nyon (Switzerland)
The strawberry blossom weevil Anthonomus rubi is an important pest in open field raspberry crops of Switzerland. Today growers tend to deploy insecticides against this pest without applying the established economic thresholds since their assessment is judged to be too complicated and too labour-intensive. In order to simplify the process, the Nachmann function was used for studying the relationship between the number of clipped flower buds per inflorescence and the percentage of inflorescences damaged. The correlation obtained was excellent (r2 = 0.91) between these two parameters using a long-term data set collected on different floricane-fruiting cultivars and the current threshold of 1 to 5 % clipped flower buds equals 10 to 35 % inflorescences having at least one bud damaged. We therefore propose to redefine the economic threshold to 10 % of inflorescences being damaged before bloom and to control 100 inflorescences per 1000 m2 once the week from the stage of flower petals elongating until the beginning of full bloom. This method reduces significantly the time for assessing damage and should consequently offer an effective alternative to the systematic application of insecticides.
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