| galls | an overgrowth of plant tissue. |
| girdled | showing mechanical damage (often from pests) to tree or shrub trunks or limbs that results in inability of cambial tissue to transport nutrients to roots. |
| girdling | mechanical damage (often from pests) to tree or shrub trunks or limbs that results in inability of cambial tissue to transport nutrients to roots. |
| gland | a general term applied to oil-secreting organs, or sometimes an obtuse projection or a ring a base of a structure. |
| gnarled | knotty and twisted. |
| growth regulator | a natural substance that regulates or interferes with growth functions in plants and insects. |
| grubs | an insect larva; a term loosely applied, but more specifically to larvae of Coleoptera (beetles) and Hymenoptera (wasps, etc.). |