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Control of Ichneumonoptera chrysophanes (Meyrick) (Lepidoptera: Sesiidae) by mating disruption in persimmons

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A ca 0.62 ha block of 480 persimmon trees at Woombye, Queensland, was treated with the pheromone of Ichneumonoptera chrysophanes emitted from polyethylene dispensers placed at a rate equivalent to 1480/ha early in September 2000. A second block of 219 trees was left untreated and served as the control. The technique was assessed using traps to measure the ability of I. chrysophanes males to locate synthetic pheromone baits, and by the incidence of fresh damage detected during December and June surveys of a minimum of 67 trees in each block. Pheromone release rates were determined approximately weekly by measuring the amount of pheromone remaining in a sample of 10 dispensers suspended within the treated block. A second orchard at Amamoor, Queensland, was partly treated with pheromone applied at a similar rate, but was monitored only in terms of trap catch. No assessments were made of damage levels. Mean pheromone-release rates ranged from 15.8 to 1.6 mg/ha/h. Over the entire period of the trial, from 8 September 2000 to 27 June 2001, no males were caught in any of the 12 traps in the pheromone-treated block of the Woombye orchard, while 944 were caught in the five traps in the untreated block. The proportion of trees with fresh damage was significantly higher in the untreated block (0.188 and 0.567; December and June surveys, respectively) than in the treated block (0.027 and 0.205), although there was no significant difference between treatments in the mean number of strikes/infested tree in either survey. In the Amamoor orchard no moths were caught in any of the 32 traps in the treated blocks, compared with a total of 303 in the 13 traps in the untreated block.
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Keywords: clearwing borer; pheromone

Document Type: Research Article

Affiliations: CSIRO Entomology, 120 Meiers Road, Indooroopilly, Qld 4068, Australia.

Publication date: November 1, 2002

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