Forest-Insect Surveys in the Central Rocky Mountains

With the growth of forestry, survey methods have been developed to detect and appraise forest-insect infestations. Detection is made by the discovery of an outbreak through field surveillance or by means of systematic aerial and ground surveys. Following the discovery of an outbreak, an inspection of the infestation is sometimes made by an entomologist to determine the need for an appraisal survey. The appraisal survey is divided into two phases: (1) an entomological measurement of the potential threat of the infestation, referred to as a biological evaluation; and (2) a systematic cruise of the area to obtain information for control planning. The objectives of the program are to allow no outbreaks to escape early discovery, and upon discovery, to obtain information about the insect concerned-where it is, what it is doing, its potentialities, methods for control, and data directly concerned with control.