The dark side of weevils | Curator of Coleoptera

Weevil researcher Dr Chris Lyal elucidates on the darker side of weevil life-histories and they are not as friendly as you may have imagined…

Weevils are perhaps the most inoffensive of beetles – well, unless you’re a farmer, forester or horticulturalist, in which case you may take a rather dimmer view of them, since some species of this huge group are major plant pests. However, to focus on the animals themselves and ignore inconvenient economics, they seem to look out at the world through immense soulful eyes, and trundle rather erratically along like one of those clockwork plastic children’s toys with slightly more legs than are truly manageable.

Damnux species, a seed predator of dipterocarp trees in Thailand.
Damnux species, a seed predator of dipterocarp trees in Thailand.

As herbivores, they spend their lives up to their antennae in plants, nibbling at leaves and flowers, buds and roots. They may have a long projecting rostrum at the front of their heads, but they do not behave like horse-flies, bed-bugs or any of the rest of the blood-sucking brigade and try and force it through your skin and suck out your life-juices. Adult weevils are covered in scales and sometimes very brightly coloured, but they have a previous existence as a larva, chomping their vegetarian way inside fruit, stems, leaves or roots. Larvae are fat, white, legless comma-shaped beasts, almost blind and apparently interested only in food.

Again, not one of nature’s bad boys (unless, as I said, you are concerned with keeping plants alive, in which case I may be irritating you by now). However, not all is as it seems. Some weevils, it turns out, have a darker side to their nature. Some are killers. Some are cannibals.

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