The use of biocontrol agents and beneficial organisms for management of plant and

pest diseases appears as an environment-friendly and economic procedure. However,

this option is not always available, depending on the lack of knowledge on the

mechanisms of natural regulation, locally effective. In this view, this eBook considers

studies and experimental works illustrating a range of problems and solutions based

on microbial resources, suitable for management of biotic stress factors. These

examples show how detailed data and knowledge on the organisms involved are of

paramount importance to achieve a sustainable and durable management capability.