Abstract
Drosophila suzukii Matsumura is a damaging invasive pest of sweet cherry. Using a series of laboratory leaf contact assays, semi-field, and orchard spray programs we aimed to determine the impact of insecticide programs on D. suzukii adult mortality and oviposition in cladding-protected sweet cherry crops. Tests included assessing adult D. suzukii mortality after contact with leaves sprayed either one or two weeks previously and emergence of adults from fruits. Spinosad, lambda-cyhalothrin, acetamiprid, lime, pyrethrin, deltamethrin, and cyantraniliprole all reduced fruit damage up to day 7 after application. Of these active ingredients, only spinosad, lambda-cyhalothrin, and cyantraniliprole gave satisfactory control up to 14 days. There was no significant difference in D. suzukii mortality when exposed to leaves treated either one or two weeks previously with an application of either spinosad, cyantraniliprole, or lambda-cyhalothrin; however, mortality was significantly higher than D. suzukii in contact with untreated leaves. In eight commercial orchards, fortnightly spray applications including spinosad, cyantraniliprole, and lambda-cyhalothrin gave effective control of D. suzukii until harvest with very few damaged fruits. These experiments demonstrate that currently approved plant protection products, applied to sweet cherry under protection, give at least two weeks protection from D. suzukii.
Highlights
Drosophila suzukii Matsumura was introduced into Europe in 2008 from Asia, probably in imported fruits [1], and first identified in the UK in 2012 [2]
We have investigated the efficacy of plant protection products on D. suzukii
We have have investigated the efficacy efficacy of plant plant protection products on D. In these we investigated the of protection products on suzukii mortality andstudies, fruit damage in cherry crops under protective claddings including how these products mortality and fruit damage in cherry crops under protective claddings including how these products mortality and fruit damage in cherry cropsfor under protective claddings including how these products can be incorporated into a spray program season-long control in protected cherries
Summary
Drosophila suzukii Matsumura was introduced into Europe in 2008 from Asia, probably in imported fruits [1], and first identified in the UK in 2012 [2]. It remains the major pest of soft fruits, including raspberries, blackberries, and strawberries [3,4], and is a major pest of stone fruits including cherry [5]. Afterwards, the treated waste must be disposed of to prevent re-inoculation of healthy fruits [10] All of these measures contribute towards control, but fruit growers still apply insecticides because the risk of oviposition into fruits is perceived as too high
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