Cucumber plants wilting despite moist soil may be experiencing heat stress, root rot, bacterial wilt, or stem damage; checking soil drainage and overnight recovery can help you identify the cause before adding more water.
Essential Concepts
Check root-zone moisture, morning recovery, and stem condition.
Related reading:
https://extension.umn.edu/yard-and-garden-insects/cucumber-beetles
https://extension.umn.edu/vegetables/growing-cucumbers
