Abstract
Abstract The fecundity of the two-spotted spider mite, Tetranychus urticae Koch, feeding on bush beans, Phaseolus vulgaris L., which received different concentrations of nitrogen (from 0 to 160 parts per million) was measured. By planting beans in sand which contained nitrogen-fixing bacteria (Rhizobium sp.) bean plants were allowed to develop root nodules. Using changes in plant biomass as a continuous measure of plant nitrogen stress, fecundity was greatest at intermediate nitrogen stress levels in experiments 1 and 2 while in experiment 3 fecundity generally declined with increasing stress. Amount of root nodulation increased with decreasing nitrogen concentration; initial development of nodules coincided with the peak in mite fecundity. Possible explanations for the nonlinear response curve are discussed.
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