Mating disruption to control the striped rice stem borer: Pheromone blend, dispensing technology and number of releasing points

다국어 초록 (Multilingual Abstract)

The effect of using low densities of different dispensing technologies on mating disruption of the striped rice stem borer, Chilo suppressalis Walker,was evaluated in the rice-growing area of Valencia (Spain) from 2011 to 2013. The reduction of the current number of release points (30 polymeric dispensers/ha) was investigated by installing 3 aerosol devices per ha (Experiments 1 and 2) or with clusters of hand-applied dispensers (10 or 5 release points/ ha; Experiment 3). The influence of pheromone blend on disruption was also studied by loading aerosol devices with the three-component blend or only the main pheromone compound, Z-11-hexadecenal. Results showed that the installation of 3 aerosol devices/ha or clusters of passive dispensers (total dose: 6.6–7.9 g/ha) proved equally effective as the conventional treatmentwith 30 Selibate®CS dispensers/ha (~5 g/ha), reducing damage below 1% of infested plants. Although the treatment with 3 aerosol devices/ha loaded with Z-11-hexadecenal provided control of damage comparable to the conventionalmating disruption treatment, the higher captures recorded suggest that mating disruption with the incomplete pheromone blend is only slightly effective in the tested conditions.
These changes in the number of point sources and pheromone blend could represent important advantages for the implementation of mating disruption against C. suppressalis.

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