Eggs and larvae will dry out and die if exposed to dry conditions. The infested plant may show early signs of withering, but this is unavoidable.
[header] How to use home remedies to get rid of gnats [title] Let infested soil dry out. [step] Allow the top 2 inches (5 cm) of soil to dry out completely before watering a gnat-ridden plant again. [substeps] Eggs are usually laid in damp, over-watered plants, and gnat larvae need to develop in moist organic material.