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Some parasitoid wasps change the behavior of the infected host, causing them to build a silk web around the pupae of the wasps after they emerge from its body to protect them from hyperparasitoids. [20] Hosts can kill endoparasitoids by sticking haemocytes to the egg or larva in a process called encapsulation. [21]
Without the virus infection, phagocytic hemocytes (blood cells) will encapsulate and kill the wasp egg and larvae, but the immune suppression caused by the virus allows survival of the wasp egg and larvae, leading to hatching and complete development of the immature wasp in the caterpillar. Additionally, genes expressed from the polydnavirus in ...
Through the evolutionary history of being used by the wasps, these viruses apparently have become so modified, they appear unlike any other known viruses today. Because of this highly modified system of host immunosuppression , a high level of parasitoid-host specificity is not surprising.
Adult wasps soon pop from their cocoons and start the cycle anew. Most parasitoid wasps dispatch prey in some such hideous manner, including entombing their paralyzed bodies.
[29] [34] To thwart this, some wasps inundate their host with their eggs so as to overload its immune system's ability to encapsulate foreign bodies; [35] others introduce a virus which interferes with the host's immune system. [36] Some parasitoid wasps locate hosts by detecting the chemicals that plants release to defend against insect ...
Adult wasps lay their eggs in tobacco hornworm (Manduca sexta) and tomato hornworm (Manduca quinquemaculata) larvae in their 2nd or 3rd instar (each instar is a stage between moltings, i.e. the second instar is the life stage after the first molt and before the second molting) and at the same time injects symbiotic viruses into the hemocoel of the host along with some venom.
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