| Term | Definition |
| Annual Weed | a weed that completes its life cycle within 1 year. |
| Pathogen | organism that produce disease. |
| Vector | a living organism that transmit a disease. |
| Nematode | a type of tiny roundworm that causes damage to specific kinds of plants. |
| Pheromone | a chemical secreted by an organism to cause a specific reaction by another organism of the same species. |
| Abiotic Disease | a disease caused by factors other than pathogens. |
| Virus | pathogenic entity consisting of nucleic acid and a protein sheath. |
| Pesticides Resistance | the ability of a pest to tolerate a lethal level of a pesticide. |
| Perennial Weed | a weed that lives for more than 2 years. |
| Entomophagous | insects that feed on other insects. |
| Weed | a plant that is not wanted. |
| Key Pest | a pest that occur on a regular basis for a given crop. |
| Fungi | members of a major group of lower plant life that lack chlorophyll and obtain nourishment from either live or decaying organic matter. |
| Insect | a six-legged animal with three body segments. |
| Mosaic | a virus disease of plants in which a leaf shows a symptom of light- and dark-green mottling of the foliage. |
| Economic Threshold Level | the level of pest damage to justify the cost of a control measure. |
| Cultural Control | pest control that adapts farming practices to better control pests. |
| Defoliate | to strip a plant of its leaves. |
| Plant Disease | any abnormal plant growth. |
| Clean Culture | any practice that removes breeding or over wintering sites of a pest. |
| Trap Crop | a susceptible crop planted to attract a pest into a localized area. |
| Biennial Weed | a weed that will live for 2 years. |
| Bacteria | one-celled, microscopic organisms. |
| Disease | infective agent that results in decreased health in living things. |
| Chemical Control | the uses of pesticides for pest control |
| Casual Agent | an organism that produces a disease. |
| Biological Control | pest control that uses natural control agents. |
| Disease Triangle | the term applied to the relationship of the host, pathogen, and the environmental in disease development. |
| Arachnid | a living creature such as a spider or mite that is distinguished from insects by having light legs. |
| Pest Population Equilibrium | a condition that occur when the number of pests stabilizes or remains steady. |
