What Is Entomology? Research Areas, Funding, and Career Paths

Entomology is the scientific study of insects — their anatomy, physiology, behavior, ecology, evolution and classification, along with the closely related arthropods (mites, ticks, spiders and other arachnids) that many entomologists also work on in practice. Insects make up the large majority of all known animal species, and entomology sits at the intersection of basic biology and some of the most consequential applied problems in agriculture, medicine and public health. This guide gives a genuine, thorough answer to what entomology studies, covers its major subfields, and adds the research-administration layer generic overviews leave out: who actually funds entomological research, the methods and tools the field relies on, and typical career and training paths into it.

What Is Entomology?

Entomology is the branch of zoology devoted to insects: their structure, development, physiology, genetics, behavior, ecology, evolutionary relationships and classification. Insects are the most species-rich class of animals on Earth — over a million species have been formally described, with estimates of total insect diversity running several times higher — and they occupy nearly every terrestrial and freshwater habitat, making entomology an unusually broad discipline in practice even though its object of study is a single class of organisms.

The field’s core questions include: How do insects’ body plans, life cycles and sensory systems let them exploit such an enormous range of environments and food sources? How do insect populations interact with plants, other animals and microbes — as pollinators, herbivores, predators, parasites, prey and disease vectors? How do insect pest and disease-vector populations respond to control efforts, and how can that response be managed sustainably rather than simply overwhelmed with more intervention? What do insects’ evolutionary history and diversity reveal about broader patterns in evolution and ecology? Answering these requires a mix of field observation and collection, laboratory experimentation, controlled rearing, and increasingly, molecular and genomic analysis.

Entomology is not a single unified specialty so much as a shared taxonomic focus applied across many other disciplines — a working entomologist is as likely to be trained primarily as an ecologist, a geneticist, a physician-adjacent vector biologist, or an agricultural scientist who happens to specialize in insects, as to hold a degree labeled “entomology” outright.

How Entomology Relates to Neighboring Disciplines

Entomology is formally a branch of biology, and more specifically of zoology, the branch of biology concerned with animal life. See CASRAI’s branches of science hub for how entomology fits into the wider map of scientific disciplines. Its boundaries with several neighboring fields are genuinely blurry rather than sharply defined:

• Zoology is entomology’s direct parent discipline: entomology is essentially zoology narrowed to a single class of animals (Insecta), and the underlying anatomical, physiological and behavioral concepts carry over directly.
• Evolutionary biology and entomology overlap heavily — insects’ extraordinary diversity and short generation times make them classic model systems for studying speciation, adaptation and coevolution with plants and other organisms. See CASRAI’s what is evolutionary biology guide for the broader discipline.
• Developmental biology intersects closely with entomology through insect metamorphosis: the fruit fly Drosophila melanogaster is one of the most heavily used model organisms in all of developmental and genetic research. See CASRAI’s what is developmental biology guide.
• Paleontology connects to entomology through the insect fossil record, including exceptionally well-preserved specimens in amber, which document insect evolution and ancient ecosystems. See CASRAI’s what is paleontology guide.
• Ecology relies on entomology constantly, since insects are dominant players in most terrestrial food webs, pollination systems and decomposition processes.
• Medicine and veterinary science depend on entomology wherever insects and other arthropods transmit disease — mosquitoes, ticks and fleas are vectors for malaria, dengue, Lyme disease and many other pathogens affecting humans and animals.

Major Subdisciplines of Entomology

Entomology is typically organized less by shared theory and more by the applied problem or taxonomic angle a researcher works on:

• Agricultural (economic) entomology — studies insects as crop pests and biological control agents, and develops integrated pest management (IPM) strategies that combine biological, cultural and chemical controls.
• Medical and veterinary entomology — studies insects and other arthropods as vectors of human and animal disease (mosquitoes, ticks, fleas, tsetse flies) and develops surveillance and control methods.
• Forensic entomology — uses knowledge of insect colonization patterns on decomposing remains to help estimate time and circumstances of death in legal investigations.
• Systematic entomology (taxonomy) — describes, classifies and reconstructs the evolutionary relationships among insect species, historically through morphology and increasingly through DNA-based methods.
• Behavioral entomology (ethology) — studies insect behavior, including communication, social organization in species such as ants, bees, wasps and termites, and mating systems.
• Physiological and biochemical entomology — studies insect internal systems, including how insects sense their environment, metabolize food, and respond to toxins — work that underlies insecticide development and resistance research.
• Apiculture and pollination biology — focuses on honey bees, native pollinators and their role in crop production and ecosystem function.
• Urban entomology — addresses insects as structural pests and public-health nuisances in and around human dwellings.

Who Funds Entomology Research

Entomology’s funding landscape reflects the field’s split identity between basic biology and applied, high-stakes problems in agriculture and public health:

• U.S. Department of Agriculture – National Institute of Food and Agriculture (USDA NIFA) is a major funder of applied entomology, particularly through its Agriculture and Food Research Initiative (AFRI) competitive grants program, which supports research on crop pests, integrated pest management and pollinator health.
• USDA Agricultural Research Service (ARS) conducts substantial intramural entomological research directly through its own laboratories, covering pest management, invasive species and pollinator research.
• National Science Foundation (NSF), chiefly through its Directorate for Biological Sciences — particularly the divisions supporting environmental biology (systematics, biodiversity and evolutionary research) and integrative organismal systems (physiology, behavior and development) — funds basic entomological research, including insect systematics, ecology and evolution.
• National Institutes of Health (NIH), principally the National Institute of Allergy and Infectious Diseases (NIAID), funds research on insects and other arthropods as vectors of infectious disease (mosquito and tick biology relevant to malaria, dengue, Lyme disease and other vector-borne illnesses).
• Centers for Disease Control and Prevention (CDC) funds and conducts surveillance-oriented vector entomology research through its work on vector-borne disease.
• State agricultural experiment stations, funded jointly through USDA formula funds and state appropriations, support applied entomology at land-grant universities, often paired with cooperative extension programs that translate research into pest-management guidance for growers.
• U.S. Department of Defense funds entomological research relevant to protecting military personnel from insect-borne disease and nuisance pests, coordinated through its pest management and force health protection programs.

Private foundation funding for entomology specifically is comparatively modest relative to these federal sources; most sustained funding in the field runs through the federal agricultural, biological-science and public-health channels above rather than large-scale private philanthropy.

Research Methods and Tools in Entomology

Entomological research draws on a distinctive mix of field, laboratory and computational methods:

• Field collection and trapping — light traps, pitfall traps, malaise traps, sticky traps and pheromone-baited traps are used to sample insect populations for monitoring, pest surveillance and biodiversity surveys.
• Laboratory rearing and colony maintenance — many research questions require controlled insect colonies (for example, laboratory mosquito or fruit fly colonies) to study development, genetics or vector competence under standardized conditions.
• Morphological and molecular identification — traditional taxonomic identification through microscopy is increasingly complemented by DNA barcoding and genomic sequencing to distinguish closely related or cryptic species.
• Microscopy and imaging — from standard light microscopy to scanning electron microscopy (SEM), used to examine fine anatomical structures relevant to taxonomy and physiology.
• Population monitoring methods, including mark-release-recapture studies, to estimate population size, movement and survival in the field.
• Bioassays — controlled exposure experiments used to measure insecticide efficacy and detect resistance in pest populations.
• Genomic and molecular tools — increasingly used for phylogenetics, population genetics and studying the genetic basis of traits such as insecticide resistance or vector competence.
• Citizen science and community monitoring programs — used in some subfields (notably pollinator and invasive-species monitoring) to extend geographic and temporal coverage beyond what research teams could achieve alone.

Career and Training Pathways

Entry into entomology typically starts with an undergraduate degree in entomology, biology or a related life science, though many practicing entomologists come from adjacent majors such as ecology, agriculture or environmental science. Graduate training — a master’s degree for many applied and extension-track roles, a Ph.D. for research faculty, museum curator and most federal research-scientist positions — is usually earned in a dedicated entomology department, most commonly at a land-grant university, reflecting the field’s historical ties to agricultural research and extension.

Typical career paths include: university research and teaching faculty; USDA research scientists (through agencies such as ARS and APHIS); state and county extension entomologists, who translate pest research into practical guidance for growers and the public; public-health and vector-control specialists working for state or local health departments; museum curators managing insect collections; consulting and industry roles in agricultural biotechnology, pest control and crop protection; and regulatory roles reviewing pesticide products or managing invasive-species risk.

The Entomological Society of America (ESA) is the leading professional society for the field in the United States, publishing several peer-reviewed journals and running the primary annual conference most U.S.-based entomologists attend. The Royal Entomological Society, based in the United Kingdom, plays a comparable role internationally.

Frequently Asked Questions

What is the difference between entomology and zoology?

Zoology is the broad study of the animal kingdom; entomology is the subfield of zoology focused specifically on insects (and, in practice, often the closely related arthropods). Every entomologist is working within zoology, but most zoologists are not entomologists.

What do entomologists actually study?

Entomologists study insect anatomy, physiology, genetics, behavior, ecology and evolutionary relationships, usually applied to a specific angle — agricultural pest management, disease-vector biology, forensic investigation, taxonomy, or pollinator conservation, among others.

— See CASRAI’s what is biology guide for how entomology fits within biology as a whole.

Is entomology a good career?

Entomology offers a range of career paths — academic research, government science, extension, public health, industry and consulting — with demand driven by persistent, practical needs in agriculture, food security and disease-vector control. As with most specialized life-science fields, a graduate degree substantially widens the available roles.

How long does it take to become an entomologist?

A bachelor’s degree (typically four years) is the entry point for technician-level roles; a master’s degree (typically an additional two years) opens most applied and extension positions; a Ph.D. (typically an additional four to six years) is generally required for independent research faculty, museum curator and most federal principal-investigator roles.

This guide is part of CASRAI’s branches of science series and its broader research methods resources. See also CASRAI’s guides on biology, evolutionary biology, developmental biology and paleontology.