Entomology and Crop Protection Lecture Notes

A comprehensive set of vocabulary flashcards covering the basics of Entomology, insect anatomy, taxonomic classification, metamorphosis stages, and pest management concepts.

Entomology

The study of insects and other relatives under Phylum Arthropoda.

Nomenclature

The naming of organisms, popularized by Carolus Linnaeus in 1753 using a binomial system (Genus and species).

Classification

The ordering of organisms into a hierarchy and specific categories.

Taxonomy

The study of insect nomenclature and classification through comparison of their morphological characteristics.

Chitin

A component of the insect cuticle used as an anticoagulant or hemostatic agent for tissue repair in humans.

Shellac and Varnishes

Commercial products derived from the insect Laccifer lacca.

Phylum Arthropoda

A phylum characterized by "joint-footed" animals (from "arthro" meaning joints and "poda" meaning feet).

Entognathous Hexapods

Organisms with mouthparts retracted within the head, such as Collembola, Diplura, and Protura.

Ectognathous Hexapods

True insects with mouthparts that are not retracted within the head.

Cuticle

The non-cellular layer of the insect body wall that lines air tubes, salivary glands, and parts of the digestive tract.

Epidermis

The cellular layer of the body wall that secretes molting fluid involved in growth processes.

Basement Membrane

The layer that separates the insect body wall from its internal organs.

Ommatidia

Minute facets covering compound eyes; each represents the lens of an individual unit called an ommatidium.

Ocelli

Simple eyes situated in the middle of compound eyes, typically numbering up to three.

Scape

The basal segment of the antenna, generally larger than other segments.

Pedicel

The second segment of the insect antenna.

Flagellum

The whip-like part of the antenna beyond the pedicel, composed of individual units called flagellomeres.

Aristate Antenna

Antenna where the last segment is enlarged and bears a dorsal bristle called an arista; found in houseflies.

Geniculate Antenna

Elbowed antenna with a long first segment and succeeding segments at an angle, such as in ants and bees.

Labrum

The "upper lip" which is a movable flaplike surface covering the top of the mouth.

Mandibles

The "upper jaws" which are tooth-like structures used for chewing, grinding, or tearing food.

Hypopharynx

Known as the "central tongue," it bears the opening of the salivary ducts.

Labium

The "lower lip" structure found posterior to the maxillae.

Proboscis

A coiled tube formed by fused galeae used for sucking nectar in siphoning-type mouthparts.

Fossorial Legs

Forelegs adapted for digging, as seen in mole crickets.

Raptorial Legs

Grasping forelegs used for catching prey, found in mantises.

Saltatorial Legs

Enlarged hind legs used for hopping, commonly found in grasshoppers.

Elytra

Hard and thickened forewings that protect the soft abdomen, common to Coleopterous insects.

Halteres

Reduced, knob-like hind wings used for balancing rather than flight, found in Dipterous insects.

Hemelytra

Forewings where the basal portion is leathery and the apical part is membranous, common to Hemipterous insects.

Tegmina

Wholly leathery forewings that protect delicate hindwings, found in Orthoptera, Blattodea, and Mantodea.

Spiracles

Breathing openings located on the 1st to 8th abdominal segments.

Cerci

Slender, forcep-like pointed structures found on the eleventh abdominal segment.

Cornicles

Paired secretory structures on the abdomen of aphids that secrete repellent substances.

Collophore

A fleshy, peg-like structure in Order Collembola used to regulate $H_2O$ balance.

Ametabolous

A developmental pattern with no metamorphosis (egg-young-adult), common in primitive orders like Thysanura.

Hemimetabolous

Incomplete metamorphosis (egg-naiad-adult) where the young live in aquatic environments.

Paurometabolous

Gradual or simple metamorphosis (egg-nymph-adult) where the immature resembles the parent except for size and wings.

Holometabolous

Complete metamorphosis (egg-larva-pupa-adult), where the pupal stage is quiescent.

Ecdysis

The process of shedding off skin periodically to accommodate growth and development; also known as molting.

Exuviae

The old skin or cuticle left after an insect undergoes molting.

Stadium

The total period of time between two molts.

Instar

The appearance of an insect immediately after molting.

Chorion

The egg shell that houses and protects the developing insect embryo.

Imago

The final adult stage of insect development in which all external characteristics are well defined.

Parthenogenesis

Reproduction where eggs develop without fertilization, requiring only females.

Paedogenesis

A special type of reproduction where the larva is capable of producing young.

Furcula

The jumping organ found in the Order Collembola.

Order Odonata

The order containing damselflies and dragonflies, characterized by strong teeth on the mandibles.

Order Blattodea

The order containing cockroaches, characterized by dorso-laterally flattened bodies and ootheca secretion.

Order Isoptera

Termites, also known as "white ants," which are specialist feeders of cellulose.

Economic Injury Level (EIL)

The lowest number of insect pests that can cause economic damage.

Economic Threshold Level (ETL)

The population density at which control measures should be applied to prevent reaching the EIL.

Phytophagous Insects

Herbivorous insects that feed on living plants.

Exotic Pest

A pest introduced into a particular area where it was previously unknown.