Abstract
Field studies on dispersal of the ground pearls, Margarodes meridionalis Morrison, were done in Tucson, Ariz. Peak adult emergence occurred in June, and all adults had emerged from the encysted stage by August. Most adults (72.3 ± 1.2%) migrated 5 cm (2 in.) from the site of their emergence; while 21.7 ± 1.0% of the adults traveled 5-10 cm (2-4 in.). Only 6.0 ± 0.7% traveled 10 cm (>4 in.) from the emergence site. Dispersal was fossorial with no evidence of surface movement. Laboratory observations indicated that emergence is triggered by increased soil moisture.
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