Invasive Insect pests are a threat to the forest whereas silviculture is the art and science of cultivating, caring for, and handling a plant. So how exactly I can join these topics together to build up comprehensive research?
To better answer your question, it is necessary to know the biotope in question, in other words the type of vegetation, the climate and the phytosanitary problems. These questions are important to identify the probable problem or dong. This will enable you to develop a strategy to follow and thus offer possible scenarios for the struggle.
You can also do a study on how certain silvicultural practices such as pruning affects the establishment rates of associated invasive species. For example does pruning at certain seasons/times of the year restrict tree growth and enhance the growth of invasives?, etc!