GLOSSARY

Complete metamorphosis
a type of insect life cycle where the immature form (larva) does not resemble the adult

Cotyledon
the first leaf of a seed plant. It is already formed in the seed but may or may not appear above ground, depending on the species.

Crochet
a tiny hook, as might be found on the bottom of the foot of an insect

Elliptical
shaped like a stretched oval

Fecal
of or referring to excrement

Frass
insect droppings

Incomplete metamorphosis
a type of insect life cycle where the immature form (nymph) resembles a small, wingless adult

Instar
immature stages of an insect or mite. Each insect or mite goes through several instars before becoming an adult.

Larva (pl. larvae)
immature stage of any insect which practices complete metamorphosis. Can also be used to describe immature first-stage mites.

Longitudinal
along the long axis of an organism or object

Mesophyll
the green, photosynthesizing tissue within a leaf

Molt
to shed one's exoskeleton in the process of moving to the next developmental stage (insects). Also used for snakes shedding their skins and birds their feathers.

Nymph
immature stage of any insect which practices incomplete metamorphosis. Can also be used to describe first stage immature mites.

Pupa (pl. pupae)
a nonfeeding developmental stage between larval and adult stages (example: chrysalis of a butterfly)

Seta (pl. setae)
sensory structures of insects that resemble small hairs, or hairlike structures of fungi such as Glomerella.

Systemic
able to move or circulate within a plant. Some diseases and pesticides are systemic.

Tubercle
small knob

Vector
a plant or animal, often an insect, that carries disease organisms

Last update to this web page on 30 June 1998 by Judy Bridges.