Pheromone Trapping System for the Velvetbean Caterpillar (Lepidoptera: Noctuidae)

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Abstract:

A system was developed for monitoring adult populations of the velvetbean caterpillar (VBC), Anticarsia gemmatalis Hübner, using pheromone-baited traps. A bucket-style trap that contained a small piece of insecticide strip to kill captured moths was the most effective of two trap designs evaluated. Bucket traps baited with rubber septa lures and impregnated with a total of 0.5 mg VBC pheromone [a 40:60 blend of (Z,Z,Z)-3,6,9-eicosatriene and (Z,Z,Z)-3,6,9-heneicosatriene] were most effective when positioned just above the canopy of the soybean crop. There was a positive relationship between quantity of pheromone loaded on rubber septa dispensers (range, 0.02–0.5 mg each) and number of male VBC moths captured in bucket traps; peak moth captures were recorded at the 0.5-mg load. Conversely, the number of VBC caught in traps baited with pheromone dosages ranging from 0.5 to 10 mg pheromone per septum declined rapidly from the optimum dosage (0.5 mg). Decline in moth captures at the higher dosage levels apparently was due to too high a release rate of one or both of the pheromone components. A method also is described for rapidly estimating moth captures in bucket traps.

Document Type: Research Article

Publication date: February 1, 1986

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