While house plant owners can get away with using yellow sticky traps to rid their plants of unwanted visitors, the solutions required for commercial cannabis pest prevention can be more involved. Many cannabis growers that have overcome pest problems swear by neem oil. Neem oil is an organic pesticide that is created with the seeds of neem trees. Neem oil is often a yellowish brown color and has a displeasing smell. You can dilute neem oil with water and efficiently spray your plants with the solution regularly until the bugs are gone.