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Fungi isolated from environmentally challenging habitats can have adaptations of potential value when developed as insect pest-controls. Fungal isolates collected from Antarctica,  Geomyces  sp. I,  Geomyces  sp. II,  Mortierella signyensis  and  M. alpina , were investigated for (i) growth characteristics at 0–35°C, (ii) spore production at 10 and 20°C, (iii) viability following exposure to freezing temperatures, and (iv) insecticidal activity against waxmoths ( Galleria mellonella  L.), houseflies ( Musca domestica  L.), mealworms ( Tenebrio molitor  L.) and black vine weevils ( Otiorhynchus sulcatus  Fabricius). All isolates showed growth between 5–20°C, with some showing growth outside this range.  Geomyces  isolates sporulated over a wider range of conditions than the  Mortierella  isolates. Spore germination at 10°C was higher for  Geomyces  sp. II when this isolate was produced at 10 compared to 20°C (greatest difference 74.6  vs  32.7%). All isolates grew, with the exception of  M. alpina , following exposure to −20°C for 4 weeks. Insecticidal investigations showed  M. alpina  and  M. signyensis  caused significant mortality of waxmoth and housefly larvae via injection and soil inoculation, and  M. alpina  caused significant mortality of housefly larvae via baiting; the  Geomyces  isolates had little lethal effect.

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Investigating the insecticidal potential of Geomyces (Myxotrichaceae: Helotiales) and Mortierella (Mortierellacea: Mortierellales) isolated from Antarctica