Abstract
Adults of the twospotted spider mite, Tetranychus urticae, were two- to sixfold greater on bean leaves, Phaseolus vulgaris, containing multiple uredinia of the rust fungus, Uromyces appendiculatus, than on rust-free bean leaves. On rust-free plants, freshly released mites went to the young trifoliolate leaves; but on rust-infected plants, they initially migrated to uredinia on older leaves. Mites became covered with echinulate urediniospores and vectored them to rust-free plants. The smooth-walled teliospores seldom adhered to the mites
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