Abstract: The life table developed for one complete and the other partial generations demonstrate that coccinellid predator Exochomus quadripustulatus (L.), Chalcid parasitoid Aphytis spp. and `other` factors (mainly overcrowding, desiccation, etc.), playing role in the four different age intervals: eggs, crawlers, second instar larvae and adults stages, were the main regulating factors for mussel scale Lepidosaphes ulmi (L.) on apple in northeast England. The predatory role of E. quadripustulatus was higher at egg stage than other in the previous generation (F1) when compared to the following generation (F2). The parasitoid Aphytis spp. contributed an important role in the over all parasitism but was less obvious in F2 generation at the egg stage. Unknown causative mortality factors, contributed major kill in the whole generations. Overall, mortality recorded in the first whole generation of L. ulmi was 94.48%. Whereas in the second generation the egg mortality was 45.59%. The reduction in fecundity and body size between previous (F1) and new (F2) generations was also noticed. Both predator and parasites complement each other in keeping the population in check.