[Natural virus carrier status in the most prevalent species of forest insects--phytophages and its connection with host viability].

Virus carriership of Ocneria dispar L. and Ocneria monacha L. was studied by microscopy and nucleic acid hybridization. A correlation was revealed between virus infection rate and viability of the insects. A high level of virus carriership in insects did not always lead to their death and viability deterioration.