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When biological effects of rubidium (Rb+) in the larval diet of Trichoplusia ni (Hübner) were measured, concentrations of as much as 14,000 ppm did not significantly alter mating, fecundity, fertility, longevity, or response of the moths to the sex pheromone of the cabbage loopers. Also, incidence of deformed moths did not increase until the concentration reached 28,000 ppm. When the larvae fed on cotton plants sprayed with RbCl, they contained measurable amounts of rubidium, hut the moths appeared to be biologically normal in every respect.
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Stimmann et al. (1973) studied this question.
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