The bars of the other species usually vary from zigzag bands to faint dots or no marks at all. One possible exception is the rarely collected Leptoglossus ashmeadi Heidemann, a species that breeds in mistletoe. This species has an unusually broad, orange crossbar, compared to the narrower white or pale yellow bar in L. phyllopus . Furthermore, L. ashmeadi has prominent orange-yellow margins on the pronotum not found in L. phyllopus . Nymphs have much the same shape as adults, but do not acquire the flattened leaf-like hind tibial expansions until well along toward becoming adults.
Eggs are golden brown and are laid in a single row or chain along a stem or leaf midrib.
They are somewhat cylindrical, flattened on the undersides and at the ends and are closely laid end to end, forming a stiff cylindrical rod in which each egg appears as a joint or cell. Later, the adults were found attacking ripening fruit, causing it to drop. Puncturing the fruit allows secondary pathogens to enter and cause rotting. They add that the bugs may start at one margin of a grove and move across it, feeding on and causing the fruit to drop. L. phyllopus is one of the bugs that causes black pit and kernel spot of pecan.