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Virus infection - Polyedrosis and granulosis viruses

Specific of the pine processionary moth. Larvae hanging from the nest as in figures on the right.

Pathogens on larva and pupa

Fungus infection

Beauveria bassiana Vuill.
Paecilomyces farinosus Dicks.
Verticillium sp.

Larvae attacked by fungi are covered by micelium inside the nest, as shown in the figure on the right (upper part).

Attacked pupae are covered by micelium in the soil (see lower part of the figure on the right).