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ViewAttendees 11

P-IE

10-Minute Paper

10-min: P-IE, IPM

Pheromone-mediated mating disruption for the suppression of the red clover casebearer moth Coleophora deauratella (Lepidoptera: Coleophoridae) in red clover seed production systems in Oregon

On-Demand
On-Demand
The red clover casebearer moth, Coleophora deauratella Leinig and Zeller (Lepidoptera: Coleophoridae), persistently occurs in red clover Trifolium pratense L. (Fabaceae) seed production systems throughout Oregon (OR). Adults lay eggs on newly set red clover heads and larvae feed on developing seed within individual florets resulting in seed yield loss.  An earlier study in Canada demonstrated a significant reduction of damage potential (reduced moth captures and subsequent larvae infestations) using a pheromone-mediated mating disruption technique. In the present study, a X-mate® disruption device loaded with the complete C. deauratella sex pheromone blend was used to determine whether pheromone‐mediated mating disruption can suppress C. deauratella in a third-year red clover seed production field. Eight plots (50 × 50 m) were set up 25 m apart in a randomized complete block design. In treatment plots (n=4), the mating disruption device was installed in the center of the plot, 35 cm above the soil surface, while control plots (n=4) remained untreated. Two green UniTraps® were placed in each plot to assess communication disruption. Traps were checked weekly for adult male captures and data on larval densities was recorded weekly from the third week onwards. Twenty-five flower heads were randomly collected from each plot weekly to determine the larval infestation and feeding injury. A significant reduction (38 ± 17.8%) in captured males of C. deauratella over the 5-week trapping period and a subsequent decline of damage (72.6 ± 8.3%) from feeding holes and larval density in treated plots compared with untreated plots.