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Insect and Spider Identification: SOLVED: Bug ID Needed

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Forum: Insect and Spider IdentificationReplies: 9, Views: 114
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dstartz
Deep South Texas, TX
(Zone 9a)

October 7, 2004
6:19 PM

Post #1083796

Found these on my butterfly weed. Any clue as to their name? Are they beneficial?

(The white on them is spackling compound from the bucket I shook them into...)

Thumbnail by dstartz
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imway2dumb
Gordonville, TX
(Zone 7b)

October 7, 2004
7:08 PM

Post #1083929

One of the ladybugs?

http://www.cnf.ca/beetle/guide.html
dstartz
Deep South Texas, TX
(Zone 9a)

October 7, 2004
7:44 PM

Post #1083958

I thought that might be true, too, but ladybugs have white on their elytra (heads); these do not.
QueenB
Shepherd, TX
(Zone 8b)

October 7, 2004
8:14 PM

Post #1083984

These are exactly what they eat: milkweed beetles. A couple of years ago they totally stripped my A. tuberosa and A. curassavica. If you look closely at the plant, you'll see the grub larvae all over it at various ages. It is NOT beneficial to your plant. They don't even acquire the toxins that Monarch butterflies do from the plant, so scientists believe that the orange is just a bluff to preditors to keep from being eaten.

http://members.aol.com/askdrjay/labido.htm
dstartz
Deep South Texas, TX
(Zone 9a)

October 7, 2004
9:05 PM

Post #1084058

They are very similar, but the markings a very different. I even did a google search and none thurned up similar markings.
Ulrich
Manhattan Beach, CA
(Zone 11)

October 8, 2004
3:51 AM

Post #1084645

Yours are too round, like lady bugs, to be milkweed critters.
http://www.daviessaudubon.org/red_milkweed_beetle.htm
http://www.cirrusimage.com/beetles_red_milkweed.htm
These are a lot longer.
dstartz
Deep South Texas, TX
(Zone 9a)

October 8, 2004
3:54 AM

Post #1084648

And their elytra (heads) are different, as well.
QueenB
Shepherd, TX
(Zone 8b)

October 8, 2004
4:10 AM

Post #1084658

They are the same insect...the spots vary, as well as the color. The correct common names are Milkweed Leaf Beetle or Swamp Milkweed Leaf Beetle. Mine were more yellow, but the spots varied from the X to a big blotch on the back.

This one has markings like yours: http://www.biosurvey.ou.edu/okwild/misc/images/smbeetle2.jpg

http://bugguide.net/node/view/7541
http://cedarcreek.umn.edu/insects/album/024107061001ap.html
http://elib.cs.berkeley.edu/cgi/img_query?enlarge=0000+0000+0404+0809
http://www.biology.duke.edu/dnhs/pics/Labidomera.jpg
Ulrich
Manhattan Beach, CA
(Zone 11)

October 8, 2004
4:29 AM

Post #1084677

Yep, you are right with those. They are Labidomera and look just like dstartz's alright. So, RED Milkweed Beetles are Tetraopes, just to confuse us.
dstartz
Deep South Texas, TX
(Zone 9a)

October 8, 2004
4:35 AM

Post #1084684

I'm convinced! Labidomera clivicollis/ Milkweed Leaf Beetles they are.

Many thanks, Queen B!

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