A well-controlled growth environment with plants that are not unduly stressed is essential for healthy plant growth. Even if they do not kill the plants outright, insect pests and microbial pathogens can cause subtle changes in plant metabolism that affect results. Therefore, regular scouting for infestations, frequent cleaning of plant growth areas, proper disposal of dead or diseased plant material, help to reduce pest infestation.
However, if an infestation gets out of hand despite reasonable precautions, insecticide spraying may be necessary.