Warning appears on the label of the next most toxic category, and Danger is on the label of the most toxic category of pesticides. Another part of your decision is to choose the right formulation of the pesticide. Different types of pests are controlled better with different types of treatments, such as baits, sprays or granules. Some insecticide formulations are more effective on particular pests than others, and you need to choose the right one. Always buy the smallest available container of a pesticide, so you will use it up faster.
Pesticides lose potency over time.
Once you've chosen the material you will use, focus on directing the control method toward the pest. For example, if the insect lives and feeds on the underside of the foliage, direct your spray there. On the other hand, if the pest lives on the trunk and branches, a light spray on the foliage will not be effective. You'll have to cover the trunk and branches. The key is to do what you have to do.