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[[wp:Beauveria]] is a fungi which can be an insect pathogen. Cost is ~$120/acre. I've seen multiple references to using it to fight bed bugs too. <ref>http://www.smithsonianmag.com/smart-news/this-fungus-is-the-ultimate-bedbug-killer-180947815/</ref><ref>video https://www.youtube.com/watch?v=YEujuH840Ow</ref> Here is a quote from a researcher:<ref>http://www.dailymail.co.uk/health/article-2236413/Dont-let-bed-bugs-bite--just-spray-away-fungus-experts-claim-works-better-chemicals.html</ref>

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That's an important distinction of natural pest control and organic farming compared with artificial chemical methods. Of course there are lot's of people with a vested interest in artificial methods, which can make it hard to get good facts.