In cucumbers most crops are nearly at their end. A clean finish is important with a view to starting the new crop.
Koppert is already giving some tips: "Completely remove all crop residue and weeds in the greenhouse. This way you deprive pest insects of the opportunity to stay on. Also important: leave the sticky traps in or put up some new traps. Then, if desired, you can monitor daily and you know if your greenhouse is actually clean and stays clean."
Source: Koppert