For the best—and safest—results, stick to natural liquid soaps and don’t vary from the recommended ingredient ratios. For typical insect protection, spray plants thoroughly with insecticidal soap once ...
Using a pyrethrin spray or aerosol labeled for gnats or flying insects gets rid of the ones flying about but has no impact on eggs and nests, Jones said.
Researchers are testing a product commonly used to treat ticks and fleas on pets to target fly and mosquito larvae with the goal of helping reduce the spread of diseases carried by these insects.