Insecticide‐based management programmes targeting codling moth, Cydia pomonella L. (Lepidoptera: Tortricidae: Olethreutinae), in apple orchards in southern France have incurred increasing levels of fruit injury in recent years. An alternative programme incorporating the use of exclusion netting named Alt'carpo has been developed. This study aimed at studying its efficiency and gaining more insight into its mode of action. This was achieved through laboratory and field behavioural tests and observations in a network of commercial orchards in southern France. The moths were able to lay eggs through the nets and escape from net cages in the laboratory. Male moths released in the netted rows were poorly recaptured using sexual pheromone trapping, whereas over 20% of the released males were recaptured in unprotected rows. The netting reduced fruit injury by up to 91% compared to the unprotected rows in the experimental orchard. The efficacy of this netting was even higher in commercial orchards in which fruit injury did not exceed 0.1% without any application of specific insecticide. These results lead us to assume that netting alters the reproduction of the pest, mainly by preventing it from flying over the canopy to find mates.
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