Kabbalah Curse or Divine Discipline: What is a Pulsa de-Nura?
A single Youth ["Youth" = Metatron - see my entry, "Metatron: Anomalous Angel of the Countenance"], extending from one end of the world to the other, emerges from between her legs with sixty strokes of fire, decked in colors [the rainbow, a visible sign of the Shekhinah?]. This one is empowered over those below in Her four directions. [I:223b]
It has been taught: Radiance of those sixty surrounding her is etched on the Youth, and we call these 'sixty lashes of fire,' in which he is clothed in the aspect of the Shekhinah, blazing judgment, as it is written, ...sixty warriors surrounding her (Song of Songs, 3:7) (Zohar II:66b-67a).
The one time we see the lashes appear on Asiyah, on the plane of human action, is in Zohar II:51b, also associated with the Shekhinah:
As for this: The Angel of Elohim [who was going before the camp of Israel]...on one side she [Shekhinah, the pillar of cloud] was arrayed in crowns of Hesed [love]...On the second side, she was arrayed in lances of Gevurah [power], in sixty lashes of fire...
So evidently pulsa de-nura is a celestial-angelic force/process/attribute related to Metatron, one that births, protects, and maintains discipline among the supernal denizens. In some readings it seems to be akin to the concept of yesurim shel ahavah [divine chastisements of love] and may even flow down to the human domain in the form of strict justice - but it is not presented as a curse.
Having done more extensive search than I, The Israeli scholar, Zion Zohar, concludes that a "ritual of pulsa de-nur" actually has no foundation in the main body of Jewish mysticism. Rather, the curse(s)* performed against the PM has roots, not in Kabbalah, but in Hebrew magical texts of antiquity, such as Sefer ha-Razim 
It may be that because magical texts do not enjoy the same standing in the Jewish community as does Kabbalah, the men who participated in this curse welded their magical efforts to a medieval ritual of herem [communal ostracization - but also not a curse] and then put a fig-leaf to their bizarre innovation by telling reporters it was found in Sefer Zohar [the Haredi community does not much value the novel, and the secular authorities don't appreciate incitements to violence]. Because of Dr. Zohar's research and other works of de-bunking conducted within the Haredi community itself, it is now understood that the "Lashes of Fire" curse is a modern contrivance dressed up as 'ancient' mystical tradition.
To learn about the history of curses in Judaism, consult the the Encyclopedia of Jewish Myth, Magic, and Mysticism: http://www.amazon.com/Encyclopedia-Jewish-Myth-Magic-Mysticism/dp/0738709050
*Dr. Zohar discovered there were several differing reports about the nature and content of the ritual.