Final answer:
The best approach to eliminate flies and roaches involves using biological control tools like the sterile insect technique and pest resistant cultivars, along with botanical pesticides or pheromone traps, while being mindful of potential insect resistance development.
Step-by-step explanation:
The best method for eliminating flies and roaches involves a combination of biological control tools. Biological control includes the use of natural predators or parasites to manage pest populations.
For example, the sterile insect technique (SIT) has been used successfully to eradicate the screw-worm fly (Cochliomyia hominivorax) and significantly manage populations of pests like the Mediterranean fruit fly and the Mexican fruit fly.
SIT involves releasing a large number of sterilized male insects into the population, which then mate with females, resulting in no offspring and a reduction in the pest population over time.
Additionally, developing and using pest resistant cultivars or intercropping with certain plants can help control the presence of pests.
For instance, cotton can be interplanted with wheat or maize, which can reduce the pest burden. Furthermore, using botanical pesticides or traps made with pheromones and poplar twigs can also eliminate adult flies and roaches effectively.
However, it's crucial to remain aware of the potential development of insect resistance. Over time, insects such as houseflies have developed resistance to chemicals like DDT and its substitutes.
Thus, a sustainable approach often combines multiple methods, including biological control, resistance management, and cultural practices to effectively manage and eliminate flies and roaches.