All pesticide products will carry a statement under the Agricultural Use Requirements section of the labeling. This statement will instruct users to comply with all provisions. Pesticides damages the plants, the environment and you. They are hazards that is why the factory has to provide the consumer with warnings and labels and it is under the strict scrutiny of the Federal Government before it is released for public consumption.
Phytotoxicity, or unintentional pesticide damage to plants, results in abnormal growth, foliar burn, leaf drop, and discolored, curled, abnormal roots and spotted leaves. If phytotoxicity is severe, the plant may die. Phytotoxicity often resembles such other problems as insect damage, plant disease, and poor growing conditions such as insufficient moisture and improper fertilization. The following contribute to accidental plant injury by pesticides:
•The wide variety of plant material involved in ornamental pest control
•Pesticide drift
•Pesticide persistence beyond the intended period of pest control
*I guess you are using very light or diluted insecticides that you barely notice it on your plants or on yourself.
here is just one example from the University of Kentucky= I think this is an agricultural school:
Problems with Pesticides to take into Consideration