Exactly.

And, I think they have found a way to do it by air born methods.

I had very healthy plants in my veg garden - but, VERY little produce this year.

2 qt of green beans, 3 gal tomatoes - that all required ripening on my window ledges, peppers with no seeds in them, strange cantaloupe mutants, 3 squash, no onions, no corn and some of my sunflowers were deformed (I plant those to keep the birds off everything else.

The only thing that did well were the potatoes.

For the last 6 years, I have canned up to 12 gallons of tomatoes, had 12 or 15 qt of green beans, we had 28 squash last year, and a dozen corn ears (I only plant a few rows as a wind break)

Did the plants flower? Bees around?