What's killing my bean plants
Last year I ordered several exotic bean seeds (for example, Rio Zape) and grew lovely plants six feet high, but before they fruited they were attacked by small (2-3 cm) yellow fuzzy beetles who devoured the leaves, leaving only skeletal midribs and major veins. They proliferated rapidly, killing the plants in 2-3 days. While I doubt that these are viburnum leaf beetles, I haven't ruled it out. Do you have any idea what they are and how they can be controlled?
Sounds like Mexican bean beetles, which beans almost always get. Here is our page to help understand the life cycle and how to control them: https://extension.umd.edu/hgic/mexican-bean-beetle-vegetables
The row cover works very well.