Ayudha Pooja falls during Maha Navratri and it is popular only in South India mainly in Karnataka, Tamil Nadu, Andhra Pradesh and Kerala. Ayudha Pooja is done on Navami Tithi during Navratri. Most of the time, it falls on Maha Navami during Navratri. Ayudha Puja is also known as Shastra Puja and Astra Puja.
In its modern form Ayudha Pooja has become Vahana Puja when people worship their vehicles including cars, scooters, and motor bikes. During Vahana Puja all sort of vehicles, which are in use, are decorated with vermilion, garlands, mango leaves and banana sapling and worshipped. Most significantly during Vahana Puja a white pumpkin is decorated with vermilion and turmeric and smashed in front of the vehicle as a custom to get rid of all sorts of evils.