The use of a radioactive tracer to study the nesting system ofMastotermes darwiniensis Froggatt

A new method for the tracing of termite nesting systems is proposed and proved in field trials withMastotermes darwiniensis nesting systems. An attractive bait containing γ-ray emitting scandium-46 oxide is inserted into an infested site. The bait is eaten rapidly and taken to the nests where trophallactic transfer spreads the scandium through the colony members. The scandium is finally excreted and the excreta fixed in the gallery walls and carton of all subcentres which can then be found using a γ-ray detector. The use of other radionuclides as colloids in similar bait is described.