The answer to 'when to treat for cockroach' is that you should treat for cockroaches as soon as you notice signs of an infestation. Cockroaches are resilient pests that can reproduce quickly, so it's important to address an infestation right away before it gets out of control. The best time to treat for cockroaches is when you first see them or find evidence of their presence, such as droppings or egg casings.
Cockroaches thrive in warm, moist environments with access to food and water. They can hide in cracks, crevices, and behind appliances, so it's important to thoroughly inspect your home and treat any areas where you suspect they may be living. A professional pest control technician can help identify the source of the infestation and develop a comprehensive treatment plan to eliminate the cockroaches and prevent them from returning.