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Zombie grasshopper

Entomophaga grylli infecting a Field Grasshopper

This grasshopper has climbed to the top of a Wild Carrot stem, then hugged it tight with all six legs and waited to die. Grasshoppers never normally do that but this one was zombified by a fungus: Entomophaga grylli. Once infected, the fungus somehow made it climb and cling before killing it in a nice high spot from which it could disperse its spores. The fungus fruits from between the segments of the insect and in this photo, the fruiting is over and the fungus isn’t very obvious. But the position and pose of the grasshopper is diagnostic. And as far as I know, E. grylli is the only entomophagous fungus that infects British Orthoptera.

I saw this a lot when I was doing my PhD on Chorthippus brunneus so I’m pretty sure this is a common fungus. However, officially there are only 5 British records but I think it is just massively under-recorded: http://www.fieldmycology.net/FRDBI/FRDBIrecord.asp?intGBNum=47709

I still think this is one of the most fascinating biological interactions I’ve ever heard of. How does the fungus get the grasshopper to do that, when it is not even something in the normal behavioural repertoire of grasshoppers? Imagine if there were human infections which could change our behaviour like that …


2 Comments

  1. Gerald says:

    What a revelation! One hopes it doesn’t mutate.

  2. Neil Fletcher says:

    Perhaps there are? It could explain a lot 😉

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