Many gardeners leave bush bean plants way past their prime. Typically, after 4-5 pickings flower production drops, lower leaves yellow, and disease and insect pest problems increase. Destructive harvesting can be a good tool for vegetable gardeners who want to make room for the next crop AND control Mexican bean beetle. Here's a little video Dan and I put together this week-
Pull all bean plants up by the lower stem and strip off pods.
Foliage has significant Mexican bean beetle feeding. They were loaded with egg masses, larvae and a few lingering adults.
For more details on this pest:
Check out these cool Rhizobia nodules on the roots where nitrogen from the air is transformed by bacteria into a form of nitrogen the plant can use.
What next? Stuff the plants in a large plastic trash bag and let them "cook" for a few weeks. Plants can then be safely composted.
You've just interrupted the life cycle of this pest!