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Insect and Spider Identification: SOLVED: Douglas fir bug infestation

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Forum: Insect and Spider IdentificationReplies: 5, Views: 34
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SteveSi
Fremont, CA

June 8, 2013
4:20 PM

Post #9551376

My douglas fir is infested with these bugs. Does anyone know what these are?
I live in northern california.

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Flapdoodle
Minot, ND

June 8, 2013
6:36 PM

Post #9551492

These are aphids, but I cannot be more specific from this image. See http://www.fs.usda.gov/detail/r10/forest-grasslandhealth/?cid=fsbdev2_038413 for some possibilities.
SteveSi
Fremont, CA

June 8, 2013
7:49 PM

Post #9551553

Thanks! There seem to be 3 varieties. One as the first picture that I attached, then there are ones with two yellow dots, and a 3rd with wings. I attached another picture of a dead one with the two yellow dots. They seem to be anywhere from 2mm-7mm in length. The ones with wings are longer, because of their wings.

Last summer, and this summer the tree has been dripping an excessive amount of runny sap(honey dew?). I also see quite a few ants, and pincer bugs in the tree, as well as some spiders. Last year the tree was swarming with yellow jackets, but I haven't seen them this year.



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greenthumb99

greenthumb99
Lucketts, VA
(Zone 7a)

June 9, 2013
5:20 AM

Post #9551807

As for the ones with wings, they are probably not a different "variety". From Wikipedia: "When host plant quality becomes poor or conditions become crowded, some aphid species produce winged offspring, "alates", that can disperse to other food sources."
Flapdoodle
Minot, ND

June 9, 2013
6:28 AM

Post #9551861

About all that I can add at this point is that they could be one of the giant conifer aphids (Cinara sp.) - http://www.whatsthatbug.com/2011/01/26/conifer-aphids/
SteveSi
Fremont, CA

June 9, 2013
1:33 PM

Post #9552433

Thanks for the help!

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Other Insect and Spider Identification Threads you might be interested in:

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