Dear god, they say we live in such illuminated times and yet the fear of science contained in this tread alone is just a little bit depressing. First off, cool your collective asses, this finding isn't becoming some monstrous new age Agent Orange any time soon. Hell, the suggestion that this might be used one day as a form of pest control is the sort of absurdly hopeful statement any good lab churns out on a regular basis in an effort to keep the funding coming in.
But let's say they do find a way to monetize this and make a successful, commercial grade pesticide. This would be infinitely better than the current regimen of blanket pesticides on the market that we all blithely consume. RNA interference refers to a process a great many eukaryotic organisms use to post transcriptionally regulate their own genomes (in woefully simple terms, chopping up the message before it can be successfully translated into a protein). The genius of RNAi (and the bit that makes it an utter ***** to manipulate) is that it involves a high degree of specificity. Depending on what literature you happen to stumble across, RNAi has a complex targeting system (guided by either short interfering or micro RNAs or both, nothing's concrete at the moment) that allows it to focus on specific genes at specific times (it's the cells way of changing focus on which proteins need producing and which don't). IF this lab has successfully knocked out the gene responsible for the translation of natalisin, they have an intimate understanding of their organisms genome. Even if natalisin is present in a great many insect species, it's highly unlikely that it appears within the same region of each organism's genome and even more likely that it shares an area of high complementation at the sites bordering that natalisin gene. A pesticide developed with this sort of specificity in mind is far less likely to damage your beloved bumblebee than the scorched earth tactics we all currently condone (unless you decide to starve yourself at the moral outrage of it all.)
But all of this is moot, the future lies in aquaponic vertical farms, enclose them and bugs wont be a factor. The sooner we all realize this, the sooner we end world hunger.
If you managed to read all of that, bravo! You may elevate yourself from the 99 percent of the population that finds science excruciatingly boring when it's not being a moustache twirling villain. I suggest reading the wikipedia articles on RNAi and microRNA, they're surprisingly well maintained (though be warned, some of those sources are out of date and at other times, contradictory).
Ha, find me a viral vector that's reliably effective across a multitude of insect species and the goddamn bees and glowing kittens will be the least of your worries (as I'll be holding Nicaragua hostage with a swarm of hyper wasps brimming with Black Mamba venom).
Science is not the enemy, ignorance is the enemy. Scientific ignorance either dampens genius or breeds atrocity, sociopolitical ignorance gave birth to Herrenvolk slavery, religious ignorance gave birth to holy wars beyond counting. Science is just another human construct, capable of no more villainy than politics, religion, or entertainment.