Arboriculture Terms

state or quality of being acid (contrast with alkalinity; see pH).

group of oil bacteria resembling fungi . Actinomycetes play a role in the decomposition of organic matter and the release of mineral elements.

1) pest population or plant damage level that requires action to prevent irreversible or unacceptable physiological and/or aesthetic harm (see economic threshold). 2) a point at which the level of incompatible plant species. density. height. location. or condition threatens the stated management objectives and requires implementation of a control method(s).