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Figure

History of pear psylla resistance in Pacific Northwest to chemicals used for its control from 1945 to 1990. Bars represent the period of time from which the individual chemical was first used for pear psylla control until its use was discontinued because of development of resistance to the chemical by the psylla or because the material was withdrawn by the manufacturer (chlordimeform, 1978).

Modified from Van de Baan, H. E. 1988. Factors influencing pesticide resistance in Psylla pyricola Foerster, and susceptibility in its mirid predator, Deraeocoris bretis Knight. Ph.D. thesis, Oregon State Univ., Corvallis, 127 pp.)

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