Scale insects (which are related to stink bugs) are known to gardeners and agricultural farmers as a pest because they feed on the plants they live on and usually by way of sheer weight of numbers, destroy vegetation. A mutualistic relationship exists between some ants and scale insects so they are always seen together. The scale insects provide the ants with a liquid carbohydrate food which they excrete and the ants protect the scale insects.
Pu'er, Yunnan, China
For an overload of my Chinese insect and spider images, and non-organic subjects from China, check on my Flickr photostream at http://www.flickr.com/photos/itchydogimages