Entomology – is the branch of zoology that deals with the study of insects and other arthropods. It includes the study and control of other pests: snails, slugs, and vertebrate pest like rats.
1. PlantPathology – is the branch of biological science that deals with the cause, nature, prevention and control of plant diseases.
1. Weedscience – is the study of weeds and their control
1. Permanentpest – cause economic harm from year to year
1. Occasionalpest – those which are normally below the economic threshold and frequently cause damage above the threshold
1. Potentialpest – those that remain below the economic threshold but possess capabilities to become a permanent or occasional pest
