Drosophila suzukii: evaluation of chemical pesticides and recommendation on positioning.
The following is the summary results of two years pesticide efficacy trials to control Spotted wing drosophila (SWD, Drosophila suzukii (Matsumura)), a new invasive insect species of European fruit production. SWD infests unwounded ripening fruits and exhibits a wide host crop range, attacking berries, stone fruits, grapes and others fruits. The potential of infestation rate by SWD is considerable, thanks to an extreme fecundity and short generation times. SWD has become the first management priority for soft fruits and cherry growers in Trentino, where huge fruit losses have been reported. The insecticides phosmet, dimethoate and deltamethrin resulted effective at least till twelve days post application. Analysis on ripe fruits showed sometimes the overcoming of the maximum residue level (MRL) on raspberry for some treatments, while blackberries were always below the MRL.