What effect does the application of an Insect Growth Regulator (IGR) have on fleas?

The application of an Insect Growth Regulator (IGR) has a significant impact on the life cycle of fleas, specifically by preventing the immature forms, such as eggs and larvae, from reaching the adult stage. IGRs mimic hormones that are crucial for the growth and development of insects, disrupting their normal maturation process. As a result, the affected fleas cannot transition from their immature stages to adulthood, effectively reducing the overall flea population over time since adult fleas cannot develop and reproduce.

This method is particularly effective in controlling flea infestations, as it targets the breeding cycle rather than relying solely on killing adult fleas, which may be less effective in the long run. Adult fleas may still be present initially, which underscores the importance of using IGRs in conjunction with other control methods for comprehensive pest management.