What is that tiny hole at the end of the nut of the pistachio from?
Does a larvae of some kind make it? Is the nut ok to eat? At least half the pistachios that we buy seem to have that little hole in each one (not in the shell but in the nut itself).
The hole is not the stem end on the nut shell, but is in the meat of the nut itself – on the pointy end that opens and you can see the nut. And you can see a tiny hole in the nut – that looks like a bug drilled out!
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4 comments a "What is that tiny hole at the end of the nut of the pistachio from?"
That’s where the stem was attached!
the nut (meat) shrinks inside the shell as it dries out ????
I think its a larva burrowing in making your nut more protien filled.
The pistachio seed chalcid overwinters as a diapausing larva in infested nuts. In spring the larva pupates, and the pupa transforms to an adult that chews a tiny (1 mm) exit hole through the hard nut shell and emerges as the adult wasp. Female wasps lay their eggs in the hardening shells of maturing nuts in May and June, and the second adult generation emerges in mid- to late-summer. Some of the larvae of this generation do not emerge as adults the same year but remain in the nuts as mature larvae until the following spring. Adult female wasps that do emerge in August and September are able to oviposit through the hard shells of mature nuts, producing overwintering larvae.
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