Great Passion Fruit Famine

The  was an event in world history mentioned by Sierra Petrovita in Fallout 3.

Background
Little is known about the causes of the famine, but it can be assumed that passion fruit crops died out en masse. So, let's make some calculated and educated guesses. Considering that there was time for nuka cola to keep producing the pop, even after the shortage, means it was almost certanly not a side effect from nuclear war. Now, with no real geological evidence to suggest there was actually a large die out (or more for the sake of argument really) and the events occuring around the world at the time, it is possible that as vaults went heavily into production, large amounts of canned foods and such were required to stock them. This would have caused a severe effect on the public markets, so rather then let the public know what was really going on it is possible that perisable foods were diverted to the chinese and alaskian front lines for the soldiers while the non perishables went to places like 106 or raven rock. As crazy as it sounds I'm sure that Nuka Cola should have been able to find adequatic resources for their flavouring if it were not an extremly severe and widespread phanomon. Why else not just import from elsewhere?

Effects
Passion fruit was one of the many fruit flavors used in the making of Nuka-Cola. Despite having been introduced only a few months before the famine, people noticed the change in flavor.