Asymptotic stability for delayed logistic type equations

We study the stability of scalar delayed equations of logistic type with a positive equilibrium and a linear logistic term. The Global asymptotic stability of the positive equilibrium, called the carrying capacity, is proven imposing a condition on a negative feedback term without delay dominating the delayed effect. It turns out that this assumption is a necessary and sufficient condition for the linearized equation about the positive equilibrium to be asymptotically stable, globally in the delays. The global stability of more general scalar delay differential equations is also addressed. (c) 2006 Elsevier Ltd. All rights reserved.