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GentleFriendKisses t1_ivhbvan wrote

Reply to comment by bossonhigs in English company Oxitec has released a simple, easy to distribute commercial product they say cuts Dengue Fever spreading mosquito populations by 96%. By just adding water, genetically modified mosquito eggs mature into males whose sperm cannot result in viable female larvae. by lughnasadh

You're just describing the ecology of parasitism/pathogens. If the fungus killed the whole colony, it would have no hosts and go extinct. A fungus that did that would therefore be selected against, as it would not be able to pass on its genes following the extermination of its hosts. The evolutionary role of the fungus isn't to keep ant colonies in check, it's to pass on its genes. As killing entire colonies quickly would be detrimental to passing on its genes, it's not something that would occur sustainably.

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