Checking for bugs

 Igros Moshe (YD iV #2|)  Concerning the small bugs which are found in a number of types of vegetables

I have heard that a number of people have said in my name a certain view regarding the small worms that are known to be found in many types of vegetables. In fact I did not say any ruling in this matter. On the contrary, I am in fact more inclined to be lenient and as you and my son wrote that something which is not visible to the naked eye is not prohibited and is at least not considered an entity that is not nullified in a mixture. This in addition to the justification mentioned in Shulchan Aruch.  Or it is possible to rely on the view that an entity is nullified in a mixture of 1 to a thousand. Or the view that an entity that doesn’t survive forever separately in its original state but is attached to a mixture and can’t be separated becomes nullified or that the Rabbis did not decree that an entity is not nullified in something disgusting that a person views as repellent Also as I wrote to you and to many others that as a general rule there is great importance given in halacha to minhag (custom) of what people typically do and have done. It is prohibited to cast aspersion on the previous generations who were not concerned with these things because they didn’t know about them. Therefore I say without investigating the matter thoroughly since because of my health it is difficult at present. it is impossible to rule strictly and publicize that the matter is prohibited  And of greater importance I don’t want my name associated with those who rule that it is prohibited.