[strainer]

"they can spray as much pesticides as they want" equates substances with pesticidal properties like pepper with the likes of glyposate and chlorpyrifos products. It was a deceptively simplistic statement from the get go, which you should put aside.

Where there may be substances used for pest control which are not limited by organic certification or EPA or USDA general standards, those substances will almost certainly be ubiquitous in nature with zero conceivable impact on health and environment.

Organic standards most contentious pesticide is perhaps Copper sulphate, which has potential to taint soil biology.

Here is description of its controls and others.

https://www.federalregister.gov/documents/2018/04/04/2018-06...

"Copper Sulfate—for use as an algicide in aquatic rice systems, is limited to one application per field during any 24-month period. Application rates are limited to those which do not increase baseline soil test values for copper over a timeframe agreed upon by the producer and accredited certifying agent."