Ascovirus tnav2a (entomopathogen)
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Ascovirus tnav2a (entomopathogen)
Assigned viruses:
• Heliothis virescens ascoviruses (HvAVs)
Several closely related ascoviruses have been described infecting the tobacco budworm, Heliothis virescens and other Noctuidae. These viruses are commonly encountered in field samples, for example in North America, Australia and Asia. Frequent hosts are H. virescens, Helicoverpa armigera and Spodoptera exigua. The different strains have been named Heliothis virescens ascovirus 3a, 3b, 3c, etc.
It is difficult to infect the hosts by feeding them with particles from these viruses. Instead, transmission by injection or by parasitic wasps has been shown to be very efficient under laboratory conditions. In addition, more than half of Toxoneuron nigriceps parasitoids, field collected in Georgia, U.S.A. were able to infect healthy H. virescens caterpillars with Heliothis virescens ascoviruses (Tillman et al., 2004). The transmission mechanism apparently involves contamination of the wasps ovipositor with the viruses.
Synonyms:
Spodoptera exigua ascovirus 5a (= Heliothis virescens ascovirus 3g)
