Based on the provided information, flies are considered worse than cockroaches.
Why Are Flies Considered Worse?
While cockroaches are definitely unpleasant, flies present a more significant threat due to the following:
- Pathogen Transmission: Flies can carry over 100 pathogens. This is a greater number of disease-causing agents than cockroaches.
- Exclusion Difficulty: Flies are notoriously hard to keep out of buildings, making them a persistent pest problem.
The reference source, titled 'What's Worse', explicitly states that flies carry more pathogens and are more difficult to exclude from buildings. This makes them a greater concern than cockroaches.
A Comparison: Flies vs. Cockroaches
To understand the difference, let's look at a simple table:
| Pest | Pathogens Carried | Exclusion Difficulty |
|---|---|---|
| Cockroaches | Fewer than flies | Can be managed |
| Flies | More than 100 | Very difficult |
As shown in the table, the higher pathogen load and difficulty in excluding flies make them a more problematic pest.
Conclusion
In summary, while both are unwanted, **flies** pose a greater risk due to their ability to carry more pathogens and their difficulty to exclude from buildings. This information is drawn directly from the provided reference stating flies as carrying significantly more pathogens and being harder to keep out of a building compared to cockroaches.
