| native | inherent and original to an area. |
| necrosis | in a dead and decayed condition; of or pertaining to necrosis. |
| necrotic | in a dead and decayed condition; of or pertaining to necrosis. |
| needle miner | see leafminer (needle miners are only seen on conifers). |
| nematodes | generally, microscopic, wormlike animals that live saprophytically in water or soil, or as parasites of plants and animals. |
| nocturnal | of the night; applied to insects that fly or are active at night. |
| nodes | a joint on a stem, represented by point of origin of a leaf or bud; sometimes represented by a swollen or constructed ring, or by a distinct leaf scar. |
| nymphs | young insects which quit the egg in a relatively advanced stage of morphological development, differing from the adult in having the wings and the genitalia present only in an incompletely developed conditions; a young stage of insects with an incomplete metamorphosis, (e.g., stinkbugs, aphids, etc.). |