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Abstract: Mushroom growers have long been recognized as energetic recyclers of materials, in Australia this has also included the recycling of structures created for activities completely unrelated to mushroom culture. One such example is the use of old railway tunnels to provide a relatively inexpensive building for the cropping stages of a modern commercial operation for cultivation of Agaricus bisporus. These tunnels bring with them extreme problems of pest control particularly with regard to the very mobile pests such as Sciarid flies. Hussey (1969, 1972) noted that Sciarid flies may attack a crop at any stage of development from cooldown until cropping has been completed. Severe damage was considered to result only when very large populations of Sciarids were present in a crop. The control strategies to be adopted therefore must take into consideration the source and timing of infestation. The experiments reported below were designed to examine the method and timing of infestation by Sciarid flies in a tunnel grown crop.
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