Some of these bugs overwiner in areas and when they emerge they seek out their host or food plants.

Some move (like weather patterns) from south-to-north (generally) and are tracked similar to storm fronts in order to forecast when a farmer should begin their preventative spray programs.

Insects are known to have an extremely keen sense of smell, and use it to locate plants they want to eat. Many insects also specialize on individual plant species, or families, like a Monarch Butterfly to a milkweed. So all they have to do is sniff out one particular type of scent to target their food source. Your cucumbers will be located, resistance is futile.