C
- Callus
- Calyx
- Cambium
- Capsule
- Carabidae
- Carbamates
- Cardenolides
- Caste
- Cauda
- Cecidomyiidae
- Cellulose
- Cephalothorax
- Cephidae
- Cerambycidae
- Cerarii
- Chalcididae
- Chalcidoidea
- Chamaemyiidae
- Chelate
- Chelicerae
- Chelicerata
- Chemosterilant
- Cheyletidae
- Chitin Synthetase
- Chlorophyll
- Chloroplasts
- Chrysomelidae
- Chrysopidae
- Cicadellidae
- Cicadelloidea
- Cicadoidea
- Cimbicidae
- Circulus
- Cixiidae
- Cladodes
- Clavate
- Cleridae
- Closterovirus
- Clumped distribution
- Cob
- Coccidae
- Coccinellidae
- Coccoidea
- Coccoidea
- Coccomorpha
- Cocoon
- Cole crops
- Coleophoridae
- Coleoptera
- Colydiidae
- Cortex
- Cosmopterygidae
- Cossidae
- Cotyledon
- Crambidae
- Crawler
- Crenulations
- Cribriform plates
- Crop rotation
- Cross resistance
- Cryptochaetidae
- Cultivar
- Curculionidae
- Curly top
- Cuticle
- Cybocephalidae
- Cyclorrhapha
- Cysts