Information on herbicide/pesticide use in organic farming is abundant. A quick search (https://duckduckgo.com/?q=organic+farming) will yield plenty to begin research. Due diligence is necessary given the mass of mis/dis-information, turning fact-finding into a much more difficult process for the laymen (like me) than it should be, but seek many sources, develop a consensus.
The Wikipedia article on "Organic farming" (https://en.wikipedia.org/wiki/Organic_farming) has a section-or-two discussing the practice; it'll provide a decent jumping-off point for further research.
This is obviously a bit facetious but would you consider a duck a pesticide? Small scale artisan farmers are always looking for better solutions and often find them. A distinction needs to be made between a true organic small producer and a conventional farmer chasing an organic label and those extra dollars per pound.