How could Covid-19 could threaten global food supply?

Trump won't let migrant farm workers in to pick the produce for the U.S.
Workers themselves being afraid to pick the produce because they might expose themselves to the coronavirus because of the buses they have to ride in to get to the produce fields  to pick the produce or by being near other workers while working.

This is just the U.S. too by the way. Imagine less educated farm workers around the world with various superstitions that we don't have here and how scared they likely are worldwide also.

Incorrect information like the rumor that African Americans couldn't get coronavirus with Magic Johnson the star retired basketball player trying to make people realize that it is killing 2 to 3 times as many black people as white people in a ratio around the country. And this could be worldwide also.

My theory is that the 500 million to 1 billion white people in Europe that died from various pandemics and plagues between 500 BC and 1900 killed off people so many (500 million to 1 billion) during this time and reduced the genetics of White people to the point where we have more immunities than most other peoples around the globe.

For example, 90% of Native Americans died as soon as the White trappers came into their territory carrying smallpox, flus and Colds which took out 90 million Native Americans in the 1600s and 1700s and then all across the U.S. then. There were pandemics that went through Europe that killed 95% of the people then. So, that means only 5% were immune to whatever it was and lived. But those 5% repopulated Europe after that. This is the main reason why Europeans tended to have so many children because so many had died of plagues and pandemics historically.

So, we are entering unknown territory now with this virus hitting worldwide. There will be no area of the world untouched for very long now. Everyone is going to have to find a way to deal with this worldwide if they want to live.

So, seeing this as a worldwide struggle for physical survival is a realistic way to view all this.

In it's own way this is much more serious than the Great Depression or World War II at this point because there is NO country that will be left unaffected by this over the next few years.

So, the more afraid people are the less food there is going to be going to market worldwide.

Without provable trust food won't get grown or harvested or brought to market anywhere on earth.

I don't really remember any pandemic hitting literally every country on earth before this one that killed or maimed as many as this one is in my lifetime and I was born just after world war II.