Abstract
The insect viruses possess the same wide range of size and shape as the plant viruses and the viruses affecting the higher animals; both DNA and RNA types occur. Although many insect viruses occur freely in the tissues of the host, there are three large groups which differ sharply from all other viruses. In these groups, the virus particles are occluded in protein crystals, called, respectively, polyhedra and capsules and cause inclusion body diseases. These groups are divided into nuclear polyhedroses, cytoplasmic polyhedroses, and granuloses. In the nuclear polyhedroses, the virus particles are rod-shaped and contain DNA; as the name implies, replication is confined to the cell nucleus. In the cytoplasmic polyhedroses, the virus particles are near spherical (icosahedra), occur only in the cytoplasm, and contain RNA. In both types of polyhedroses, the crystals, or polyhedra, contain many hundreds of virus particles.
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