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Experiments were undertaken to determine the potential for using rubidium chloride (RbCl) or cesium chloride (CsCl) to mark southwestern corn borer, Diatraea grandiosella Dyar, for use in applied ecological studies. Maize, Zea mays L., plants were sprayed withaqueous solutions of RbCl or CsCl at rates of 100, 1000, or 10,000 g/g and inoculated with D. grandiosella neonates. Rubidium and cesium were successfully absorbed and translocated in maize plants. There were only a few minor effects of the treatment on maize or on southwestern corn borers. Rb and Cs were detected in plants, but not in insects, by using ßame atomic absorption spectrophotometry. Graphite furnace- atomic absorption spectrophotometry (GF-AAS) and neutron activation analysis (NAA) allowed identiÞcation of Rb and Cs in adults. Rb and Cs were detected by GF-AAS in feral unmarked adults, and they contained higher levels of Rb than Cs. Males and females contained similar amounts of Rb, but Cs levels were higher in males than in females. Adults recovered from Þeld maize treated with 1000 g/g Cs had higher levels of Cs than did those from untreated plants. Using NAA, neither Rb nor Cs was detected in adults recovered from greenhouse-grown untreated maize. Males and females recovered from maize treated with1000 g/g RbCl and CsCl contained similar amounts of Rb, but females contained more Rb than Cs. We conclude that application of 1000g/g RbCl or CsCl on plants is effective in marking adults of D. grandiosella withRb or Cs and would be useful for markÐrecapture dispersal studies.

environmental entomology

Rubidium Chloride and Cesium Chloride Sprayed on Maize Plants and Evaluated for Marking<i>Diatraea grandiosella</i>(Lepidoptera: Crambidae) in Mark–Recapture Dispersal Studies

Rubidium Chloride and Cesium Chloride Sprayed on Maize Plants and Evaluated for MarkingDiatraea grandiosella(Lepidoptera: Crambidae) in Mark–Recapture Dispersal Studies