TOLERANCE TO DICOFOL IN A FIELD POPULATION OF EUTETRANYCHUS-BANSKI (MCGREGOR)

Dicofol tolerance of a field population of Texas Citrus Mite, Eutetran ychus banksi (McGregor) (TCM) of unknown exposure time and a laborator y population of the same species which was collected routinely from an unsprayed orange orchard and reared for thirty-four generations (nine teen months) free from any acaricide application were compared. Experi ments were conducted from August 1990 through April 1992 to determine the base line susceptibility for TCM populations. No conventional resi stance to dicofol was detected in the field population. Results are us eful in providing a permanent monitoring program for identifying the d evelopment of resistance.