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This Weevil Has Puppet Vibes But Drills Like a Power Tool | Deep Look
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This fuzzy acorn weevil can’t crack open acorns like a woodpecker or chomp through them like a squirrel. Instead, she uses her incredibly long snout, called a rostrum, to power-drill through an acorn’s tough and resilient shell. And it's not just lunch on her mind – she's also making a nursery for her babies.
DEEP LOOK is an ultra-HD (4K) short video series created by KQED in San Francisco and presented by PBS Digital Studios. See the unseen at the very edge of our visible world. Explore big scientific mysteries by going incredibly small.
—
This tiny, fuzzy acorn weevil can’t crack open acorns like a woodpecker or chomp through them like a squirrel. Instead, she uses her incredibly long snout, called a rostrum, to power-drill through their tough and resilient shell.
The weevil starts by probing an acorn’s surface with her supersensitive antennae. She likes the acorns that are still soft and green. Once she finds a good nut, she begins to chew.
The weevil’s rostrum curves downward to let her bite straight into the acorn she’s standing on. Normally, this would mean the tunnel she makes would also curve. But as the weevil eats, she walks her body in a circle around the hole, drilling an arrow-straight tunnel. The naturally arched rostrum straightens as it drills.
But this weevil has more than lunch on her mind – she’s also making a nursery. A few days after she deposits her eggs, larvae will hatch and chew their way out of the acorn. The larvae quickly burrow beneath the soil for protection, where they remain pupating into adults before emerging to start the cycle over..
--- Are acorn weevils harmful to oak trees?
The weevils have no impact on mature oak trees. The larvae eat what's inside the acorn but don't harm the tree itself.
--- Are acorn weevils pests?
Yes, the weevils are considered pests for many species of oak tree, because they lay their eggs inside the acorn. Those seeds might be less likely to sprout than uninfested acorns. But some may still manage to grow into new oak seedlings.
— Are there other species of weevils?
There are approximately 60,000 species of weevils. Weevils are beetles known for elongated snouts.
--- Do weevils carry disease?
No. Though they are associated with some of the basic foods we consume, weevils are not associated with the transmission of any infectious diseases affecting human beings.
---+ Find additional resources and a transcript on KQED Science:
---+ More Great Deep Look episodes:
What Gall! The Crazy Cribs of Parasitic Wasps
These Silk-Swinging Caterpillars Will Ruin Your Picnic
You'd Never Guess What an Acorn Woodpecker Eats
---+ Shoutout!
🏆Congratulations🏆 to these fans on our Deep Look Community Tab who correctly answer our GIF challenge!
@nataliet8149
@pauljames5826
@yashpd2653
@aa-ron9485
@TheBestInsects
See the question here:
---+ Thank you to our Top Patreon Supporters ($10+ per month)!
Burt Humburg
Max Paladino
Karen Reynolds
Daisuke Goto
Chris B Emrick
Tianxing Wang
Companion Cube
David Deshpande
Wade Tregaskis
Laurel Przybylski
Mark Jobes
Carrie Mukaida
El Samuels
Jessica Hiraoka
Noreen Herrington
Louis O'Neill
Levi Cai
Jeremiah Sullivan
Laurel Przybylski
Elizabeth Ann Ditz
LAUREL PRZYBYLSKI
Titania Juang
Roberta K Wright
Jellyman
Mehdi
KW
Syniurge
SueEllen McCann
xkyoirre
TierZoo
---+ Follow Deep Look and KQED Science on social:
---+ About KQED
KQED, an NPR and PBS member station in San Francisco, serves Northern California and beyond with a public-supported alternative to commercial TV, radio and web media.
Funding for Deep Look is provided in part by PBS Digital Studios and the members of KQED.
#acornweevil #oaktree #acorns
DEEP LOOK is an ultra-HD (4K) short video series created by KQED in San Francisco and presented by PBS Digital Studios. See the unseen at the very edge of our visible world. Explore big scientific mysteries by going incredibly small.
—
This tiny, fuzzy acorn weevil can’t crack open acorns like a woodpecker or chomp through them like a squirrel. Instead, she uses her incredibly long snout, called a rostrum, to power-drill through their tough and resilient shell.
The weevil starts by probing an acorn’s surface with her supersensitive antennae. She likes the acorns that are still soft and green. Once she finds a good nut, she begins to chew.
The weevil’s rostrum curves downward to let her bite straight into the acorn she’s standing on. Normally, this would mean the tunnel she makes would also curve. But as the weevil eats, she walks her body in a circle around the hole, drilling an arrow-straight tunnel. The naturally arched rostrum straightens as it drills.
But this weevil has more than lunch on her mind – she’s also making a nursery. A few days after she deposits her eggs, larvae will hatch and chew their way out of the acorn. The larvae quickly burrow beneath the soil for protection, where they remain pupating into adults before emerging to start the cycle over..
--- Are acorn weevils harmful to oak trees?
The weevils have no impact on mature oak trees. The larvae eat what's inside the acorn but don't harm the tree itself.
--- Are acorn weevils pests?
Yes, the weevils are considered pests for many species of oak tree, because they lay their eggs inside the acorn. Those seeds might be less likely to sprout than uninfested acorns. But some may still manage to grow into new oak seedlings.
— Are there other species of weevils?
There are approximately 60,000 species of weevils. Weevils are beetles known for elongated snouts.
--- Do weevils carry disease?
No. Though they are associated with some of the basic foods we consume, weevils are not associated with the transmission of any infectious diseases affecting human beings.
---+ Find additional resources and a transcript on KQED Science:
---+ More Great Deep Look episodes:
What Gall! The Crazy Cribs of Parasitic Wasps
These Silk-Swinging Caterpillars Will Ruin Your Picnic
You'd Never Guess What an Acorn Woodpecker Eats
---+ Shoutout!
🏆Congratulations🏆 to these fans on our Deep Look Community Tab who correctly answer our GIF challenge!
@nataliet8149
@pauljames5826
@yashpd2653
@aa-ron9485
@TheBestInsects
See the question here:
---+ Thank you to our Top Patreon Supporters ($10+ per month)!
Burt Humburg
Max Paladino
Karen Reynolds
Daisuke Goto
Chris B Emrick
Tianxing Wang
Companion Cube
David Deshpande
Wade Tregaskis
Laurel Przybylski
Mark Jobes
Carrie Mukaida
El Samuels
Jessica Hiraoka
Noreen Herrington
Louis O'Neill
Levi Cai
Jeremiah Sullivan
Laurel Przybylski
Elizabeth Ann Ditz
LAUREL PRZYBYLSKI
Titania Juang
Roberta K Wright
Jellyman
Mehdi
KW
Syniurge
SueEllen McCann
xkyoirre
TierZoo
---+ Follow Deep Look and KQED Science on social:
---+ About KQED
KQED, an NPR and PBS member station in San Francisco, serves Northern California and beyond with a public-supported alternative to commercial TV, radio and web media.
Funding for Deep Look is provided in part by PBS Digital Studios and the members of KQED.
#acornweevil #oaktree #acorns
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