Kaye from Eugene, Oregon writes
Insecticidal soaps and horticultural oils must directly contact the insects to control them and are most efficacious on newly hatched nymphs but can have 80-90% control if used correctly. Horticultural oil can also smother the egg stage. Neem-based products act as anti-feedants, insect growth regulators, and repellants. Research from New Jersey has shown a 50% reduction of azalea lace bugs after a neem application. Early season control is very important with these tools. I hope this helps.
Answer last updated on: 03/29/2020