Wrapped tassels are believed to result from a combination of high temperatures, abundant moisture and nutrient availability. These conditions can cause the tassel to emerge before the flag leaf has had time to fully unfurl, similar to rapid growth syndrome seen in early vegetative stages.
For silage production as in grain production, the main concern lies in potential pollination problems. Starch content, a key component of silage quality, comes from the ear, so poor pollination can lower starch levels in the final feed. While other nutrient components and total yield are not expected to be significantly affected, there is limited research on its implications due to the rarity of this issue.
Source : iastate.edu