Internally infesting insects are generally considered the most damaging of the stored grain
insects, since damage can occur with very little or no visible indication. After
oviposition, females of these hidden insects secrete a gelatinous substance to glue the hole,
usually flush with the seed coat (Pedersen, 1992). The hidden infestation is not easily
detected, nor is it easily removed in processing. Detecting the presence of insects in grain
and grain products is thus an important factor in the integrated approach to stored grain
insect control.