Umm, if I'm not mistaken, these very well could be spider mites. However, I'm against the use of insecticides. If he wants to get rid of them, he can steep some tobacco in water for a day or so, then drain the water into a spray bottle. Next add about 1-1 1/2 tsp. of antibacterial lemon scented dish soap. Finish filling container with water. Spray plants. Bugs leave...it stings them.

* * * *

They recommend chewing tobacco. But, I tend to use the tobacco left inside a cigarette after it is put out. I just empty it into an old nylon stocking and make tea out of it. Thing is, I steep mine for several days to make it good and strong like the chewing tobacco. As far as I know this works on all plants.

There are other ones too. One can be found here:
http://lady_sensual.tripod.com/id1.html (scroll down a bit and please overlook my construction on the site).

* * * *