Some are important predators of other spider mites. For example, in the last few years a Hong Kong strain and a Beijing strain of human influenza have been labelled. Strains of the insect pathogen Beauveria bassiana likewise have been labeled. Strain does not mean the same things as species . The thorax is packed with muscles for the wings and legs which arise from that section.
Some viruses are entomopathogens .
The intermediate host , of disease-producing organisms, which conveys them. These are very small insects , seldom more than 2 or 3 mm in length, that resemble tiny moths. The adults of both sexes are winged and are usually covered with a white dust or waxy powder. First instars are active and called crawlers. Later instars are sissile and look like scales.