Mauli (the sacred red–yellow thread tied on the wrist during pujas) is not tied during Pitru Paksha puja because the rites performed in this period are meant exclusively for the Pitrus (ancestors) and not for the Devas (gods).
Mauli’s significance
Mauli is usually tied while invoking and worshipping Deities during auspicious occasions like Upanayanam, marriages, Satyanarayan Katha, Navaratri pujas, etc. It represents blessings, protection, and auspiciousness (mangalya).
Nature of Pitru Paksha
Pitru Paksha is a period dedicated to Shraddha, Tarpan, and rituals for ancestors. It is considered a somber and non-auspicious time (called anushthana kala), not meant for celebrations or auspicious symbols.
Why Mauli is avoided
Since Mauli is a symbol of auspiciousness and Deva-puja, it is not tied when the focus is on Pitru rituals, which are more about gratitude, remembrance, and offering rather than invoking divine blessings for prosperity.
In fact, many households even avoid things like mangal-dhwani (conch blowing, bells) and festive decorations during
Pitru Paksha.
Mauli is not tied during Pitru Paksha puja because the rituals are meant for Pitrus, not for Devas, and tying Mauli symbolizes auspiciousness, which is not aligned with the somber nature of Pitru Paksha rites.