1. Which insects are farmed today?
But many edible insects are also 'managed' by humans in ways that have significant effects on the insects themselves: They reach higher numbers and higher densities, they live in man-made environments and feed on human foods, much like mammalian domesticates. They include: Crickets and grasshoppers in the Americas, Asia and Oceania; many species of Saturniidae (silk-producing caterpillars) across southern Africa; stinkbugs in Asia and Africa; palm weevils in Asia, Oceania and Africa; weaver ants in southeast Asia; aquatic Hemiptera in South America; wasps (of course) in Asia - and perhaps many, many others.
Insects are also domesticated by other insects. Ants are known to 'keep' aphids and caterpillars, milking them for their secretions and even collecting and protecting their eggs in purpose-built chambers within their nests. (The holy manna of the Bible is also an insect secretion, by the way, and in the early 20th century this was still eaten as a delicacy in some parts of the world - perhaps it still is).
Anyway..this question is really just a way of introducing a recent research poster made in collaboration with Kenichi Nonaka - The biogeography of insect semi-domestication. We're presenting this today at the International Geographical Union Regional Conference in Krakow, Poland, and it's part of an ongoing project looking at examples of insect 'domestication' from around the world. Here it is (I'll try to put up a higher-resolution image later):
2. Why are insects not allowed in animal feed?
(But, the paper also raises further questions - What is the nature of the 'improved immunity' that characterises Chinese chickens fed on insects? In what way is the meat form these chickens 'better quality'? As far as I know, these questions are yet to be answered.)