The ornamental design for a pesttrap, as shown and described.
FIG. 1 is a perspective view of a pest trap showing my new design;
FIG. 2 is a bottom plan view thereof
FIG. 3 is a top plan view thereof
FIG. 4 is a front elevational view thereof; and,
FIG. 5 is a right or left side elevational view thereof.
The rear elevational view is a mirror image of the front elevational view, and the left side elevational view is a mirror image of the right side elevational view.
The broken lines shown in the drawing illustrating unclaimed environmental structures form no part of the claimed design.