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Class: Insecta - Trying to ID an insect from crop damage
February 18th, 2014
12:01 pm
[futurenerdymom]

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Trying to ID an insect from crop damage
ovals

These tiny ovals (just a couple of millimeters) are all over a lot of the lower leaves, in the corn fields I've been studying. I found out what was causing them last year, but then I went on maternity leave and I totally forget and can't find a record of it...

I think it's some kind of parasitic wasp, and not actually something that's harming the plants. But I recorded the occurrence of these ovals as part of my data collection on crop damage so I'd love to at least know what they are, haha. Could be an interesting quantification of potential for beneficial parasitism?

TIA!

(6 bugs ~'*|*'~Catch a bug)

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From:2morrows
Date:February 19th, 2014 10:00 pm (UTC)
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I know nothing about agricultural entomology, but maybe include your geographic location to help others?

:)
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From:futurenerdymom
Date:February 20th, 2014 05:58 pm (UTC)
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true say! Thanks :) I'm in eastern Ontario, Canada
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From:jhennara
Date:February 20th, 2014 03:46 am (UTC)
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Are you sure it is insects? I went looking and found similar damage gained from corn eyespot https://www.pioneer.com/home/site/us/agronomy/crop-management/corn-insect-disease/eyespot/
which says that it's a fungus. I suggest taking a look at the website and maybe something there will click.
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From:futurenerdymom
Date:February 20th, 2014 06:00 pm (UTC)
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thanks for the link! lol it is tagged a 'suspicious comment'. No links allowed? anyways it does look pretty similar to corn eyespots but I think I figured it out! http://www.channel.com/Agronomics/Pages/Spots-on-Corn-Leaves-Arent-Always-a-Disease.aspx corn blotch leafminer.
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From:jhennara
Date:February 20th, 2014 04:49 am (UTC)
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Google corn eyespot. It looks very similar to your photo. Says that it is a fungus, not a wasp though :(
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From:futurenerdymom
Date:February 20th, 2014 06:03 pm (UTC)
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figured it out I think! corn blotch leaf miner. Gets parasitoid-ized by a wasp which is probably what I was remembering, crossing wires...
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