What fruits and veggies are the most ethylene-producing? What are the most ethylene-sensitive?

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Onions and potatoes — There's an online myth that onions and potatoes should be stored separately because of ethylene problems. In fact, onions generate fairly little ethylene. The biggest reason to keep them apart is that potatoes produce a decent amount of moisture, and onions have to be stored in a dry environment. [2].
- Optimal potato storage [2] — Store them in a cool place to avoid sprouting. The exact temperature depends on potato variety, but is generally 37-55°F. Ideally they should be kept in a dark place, such as a cardboard box.
- Optimal onion storage — Store them in a cool, dry, well-ventilated place, and avoid bruising them. Don't store them in a plastic bag; ideally they should be in a mesh bag, wire basket, or wooden crate.