I think it’s important to alert the Lubavitch community about the dangers of eating the esrog after Sukkos.
I personally know many who use there esrog to make jam or esrog flavored mashke.
Esrog growers use a huge amount of pesticides to keep the bugs away and preserve the esrogs’ appearances.
Apparently, since esrogs are not usually eaten, the authorities do not regulate the amount of pesticides used on them.
Leading esrog growers in Israel have confirmed that they use large amounts of very strong pesticides to keep the esrog trees free of infestation (you can call them yourself to confirm this).
It is not known how deep the insecticide sinks into the fruit.
Before consuming esrogs or esrog jam, you may want to weigh the Segulos of eating the esrog against the possible dangerous effects of the insecticide (especially if you are expecting).