Figure 3. Larvae of the Diaprepes root weevil, 24 h post inoculation with homogenate from a iridescent virus-6 (IIV6) infected larvae, showing the range of pathogenicity. 1. Control larvae injected with water. 2. Larvae darkening, blackish color usually dies 3 - 4 d post inoculation. 3. Larvae yellowish color, usually dies 5 - 7 d post inoculation. 4. Larvae normal coloration, covertly infected, no visible symptoms.