Response of a parasitoid fly, Gymnosoma rotundatum (Linnaeus) (Diptera: Tachinidae) to the aggregation pheromone of Plautia stali Scott (Hemiptera: Pentatomidae) and its parasitism of hosts under field conditions

Published source details Higaki M. & Adachi I. (2011) Response of a parasitoid fly, Gymnosoma rotundatum (Linnaeus) (Diptera: Tachinidae) to the aggregation pheromone of Plautia stali Scott (Hemiptera: Pentatomidae) and its parasitism of hosts under field conditions. Biological Control, 58, 215-221.
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This study is summarised as evidence for the following.

	Action	Category
	Use chemicals to attract natural enemies Action Link

Use chemicals to attract natural enemies

A controlled, replicated study in 1999 in Ibaraki Prefecture, Japan (Higaki & Adachi 2011) found greater parasitism of brown-winged green bugs Plautia stali in traps with an attractive chemical (6.0% individuals parasitized) than in control traps with light lures (2.7% parasitized). Parasitic flies Gymnosoma rotundatum were attracted to a chemical (methyl-2,4,6-decatrienoate) naturally produced by male brown-winged green bugs. In a separate experiment manipulating groups of bugs, the fly G. rotundatum parasitised 1-17% of bugs baited with the chemical compared to 0% for unbaited bugs. Monitoring from 2000 to 2005 found much fewer parasitic flies (approximately 25-95 adults captured at peak numbers) than brown-winged green bugs (260-9,710 adults) were attracted to traps with chemical lures. From April to November 1999, water-basin traps with 85 mg of methyl-2,4,6-decatrienoate were placed in Japanese paulownia Paulownia tomentosa trees and catches were compared with light traps (using 100 W mercury vapour lamps). In the second experiment (repeated six times) groups of 10 brown-winged green bugs were attached to frames with and without chemical lures and parasitism was monitored. Monitoring in 2000-2005 tested the lure in 2-5 water-basin traps/year from April to November.