Eligibility of Wood

This is a more general question about the eligibility of wood as renewable fuel. Following the Reference Guide I get the impression that all wood apart from untreated waste and mill residue is ineligible. To my opinion this definition is too tight. I am thinking of wood specifically grown to be used as fuel in wood pellet stoves, CHP or whatever. Assuming this wood comes from sustainable foresting (whatever the criteria may be) this should count as renewable energy in my opinion. Couldn’t a field of fast growing poplar cut down every 5 years or a pine forest cut down every 100 years and grown only to produce fuel be seen as agriculture? Is it more sustainable and renewable to take potential food like corn and cereal to produce ethanol than using wood as fuel? Any comments /thoughts on that?