The ornamental design for a treestandaccessorycover, as shown and described.
FIG. 1 is a top and front perspective view of a first embodiment of the tree stand accessory cover having flared sides;
FIG. 2 is a bottom and front perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a rear elevation view thereof; and,
FIG. 7 is a top and front perspective view of a second embodiment of the tree stand accessory cover having non flared sides. All other views being the same as shown in the first embodiment.
The broken lines depict environment and are included for the purpose of illustrating only and form no part of the claimed design.