However, in the present study the synthetic pyrethroid combination of deltamethrin and allethrin could not bring about
the desired reduction in cockroach infestation in comparison to propoxur.
Propoxur is also known to cause greater ootheca detachment and reduced hatchability thereafter and therefore has a higher efficacy against cockroaches. Low levels of resistance have been found in B. germanica for propoxur whereas high level of resistance for deltamethrin has been found in some other studies