They are Bermuda spider mites. They are beneficial in most cases, unless the population gets to large.

Let me put in another bad word about all-in-one type pesticides (combined fungicide, insecticide, miticide, whatever) such as Orthenex. The acephate insecticide in Orthenex not only kills mite predators but it and several other insecticides are known to stimulate mite reproduction. To counteract this, several rose insecticides are routinely formulated with a miticide. Now, if the you then use such a product to control mites, you not only have to spray a more toxic mixture because of the insecticide, but you probably have to spray a more concentrated version of the miticide because its efficiency is decreased by the insecticide. I'm not saying that spraying any single pesticide is a good thing, I'm saying that spraying a combined pesticide is probably a worse thing.

I was confused at first, til I saw "nesting material". Cool idea! I have lots of spiderwebs around, so I don't think I need to move any. But I have to admit, that is REALLY thinking about your hummers!!! I suspect it is VERY hard to "move" spiderwebs (they are really sticky of course). But I look forward to hearing about how well it works. If I may make a suggestion... The only hummer nests I have ever found in the yard were in small cedar trees. If you can move a spider web, you might as well deposit them on those (or of course anywhere you think they might nest).

spiders are your friends.. they are predators of many problem insects.. i would hestitate to get rid of them ... they may be there because another problem pest is in high population .... where are you .. was the house vacant? .... take a deep breath .. i know you hate spiders... but dont create bigger problems ... first step i recommend.. see if spiders are a problem for your new neighbors.. if not.. then you dont need to nuke the place ... they are there for a reason .. what if they are keeping the blood sucking skeeters in check .. which would you rather have??.. i will take the spiders ... this years spike in population, for whatever reason .. may not be there next year ... and try to ID the spiders... i guess i am presuming you have plain old spideys.. and not dangerous ones.. good luck.. ken