I added in Gram negative bacteria

Wolbachia is a genus of Gram negative bacteria which infects arthropod species, including a high proportion of insects, but also some nematodes. It is one of the world's most common parasitic microbes and is possibly the most common reproductive parasite in the biosphere. Its interactions with its hosts are often complex, and in some cases have evolved to be mutualistic rather than parasitic. Some host species cannot reproduce, or even survive, without Wolbachia infection. One study concluded that more than 16% of neotropical insect species carry bacteria of this genus,[4] and as many as 25 to 70% of all insect species are estimated to be potential hosts.[5]

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lepidopteran pests