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Abstract: The nematode Steinemema feltiae (Nematoda: Steinemematidae) was tested for its ability to control two main mushroom pests i.e. the sciarid Lycoriella auripila (Diptera: Sciaridae) and the phorid Megaselia halterata (Diptera: Phoridae). Nematodes were applied at different times during the growing cycle: halfway spawnrunning, 1 day before casing and 1 day after casing and 1 week after casing. We found that compost treatments were effective in controlling the Fl-generation of L. auripila but failed to control M. halterata. The early compost and casing treatment controlled female sciarids very efficiently. In situations of low to moderate sciarid infestations these early treatments will probably suffice. In cases of high initial populations, a late casing treatment with S. feltiae is very effective in controlling the F2-generation of L. auripila. This late S. feltiae treatment also reduced the F2-generation of M. halterata by 74%.
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