No. The Act only relates to high hedges. To constitute a "high hedge" the trees and/or shrubs must firstly constitute a hedge.
The Act does not define a "hedge" but the Oxford English Dictionary defines a "hedge" as "a row of bushes or low trees (e.g. a hawthorn, or privet) planted closely to form a boundary between pieces of land or at the sides of a road".
If the trees or shrubs that are causing you a problem are not a hedge then you cannot make an application under the Act. It will be for the investigating case officer to decide whether trees planted closely together form a hedge, or not. If they are not a hedge then you cannot apply for a High Hedge Notice.
The Act specifically states that a single tree or shrub cannot constitute a high hedge.