Sealing holes with ash paste and crushed garlic is a natural technique used to combat pests such as borers and borers that bore into stems and trunks. This mixture acts as a repellent and physical barrier. The ash helps dry and protect the wound, while the garlic has insecticidal properties that scare away insects. By applying the paste directly into the holes, it prevents the larvae from continuing to advance and promotes the recovery of the plant tissue.