Week_12A_Fungi_and_Insects_for_posting

Week_12A_Fungi_and_Insects_for_posting - Fungi and Insects...

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Unformatted text preview: Fungi and Insects Fungi and Insects April 14, 2009 How do we know that fungi and How do we know that fungi and insects interact? ► Just because two things occur at the same time in the same place, does that mean they interact? ► Case study: Fungus gnats and Pythium Fungus gnats and Pythium Fungus gnats and ► Pythium infects the roots of seedlings ► Pythium produces spores in the soil ► Fungus gnat larvae burrow in the soil, eating plant material and fungal spores ► Larvae DO NOT move from pot to pot ► Adult fungus gnats do fly from pot to pot ► Adults DO NOT burrow in the soil or eat Some well­characterized Some well­characterized fungal/insect interactions ► Dutch elm disease and elm bark beetles ► Oak wilt and nitidulid beetles ► Stinkhorns Kinds of fungal/insect interactions Kinds of fungal/insect interactions ►Transmission of spores ►What other kinds of interactions exist? Kinds of fungal/insect interactions Kinds of fungal/insect interactions ► Transmission of spores ►Insects feed on fungi Ambrosia beetles Ambrosia beetles Kinds of fungal/insect interactions Kinds of fungal/insect interactions ► Transmission of spores ► Insects feed on fungi ►Insects cultivate fungi http://www.youtube.com/watch?v=RH3KYBMpxOU African termites African termites Inside a termite mound Kinds of fungal/insect interactions Kinds of fungal/insect interactions ► Transmission of spores ► Insects feed on fungi ► Insects cultivate fungi ►Fungi feed on insects Sericulture = Silk worm farming White muscardine disease White muscardine disease ► Decimated silkworm farms in Italy in the first half of the 1800’s ► Agostino Bassi Lawyer with biological interests Showed that muscardine was caused by a fungus Beauveria bassiana Gypsy moths Gypsy moths ► Introduced from Asia in 1868 ► Eat a wide range of plants ► Cause significant damage when populations levels are high Fungus killed larvae Virus killed larvae in upside down V shape Gypsy Moth Larvae infection by Entomophaga maimaiga Fungal spores produced on stalk Parasitized insect Cardiotonic Energy enhancing Anti­aging Enhancing sex drive Hepatoprotective Kidney tonic Anti­tumor Anti­diabetic Anti­hypertension Stomach tonic http://www.youtube.com/watch?v=CCOQ0VU24xw Kinds of fungal/insect interactions Kinds of fungal/insect interactions ► Transmission of spores ► Insects feed on fungi ►Insects cultivate fungi ►Fungi feed on insects Categorization of symbioses Categorization of symbioses mutualism parasitism Categorization of symbioses Categorization of symbioses mutualism parasitism How to classify? How to classify? ► Septobasidium ► Scale insects Felty patches on branches Suck nutrients out of trees ► Symbiotic relationship Categorization of symbioses Categorization of symbioses mutualism parasitism ? ...
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