the association of these filaments with development of disease , their occurrence in phloem cells as seen by both freeze-etching and thin-section electron microscopy , the diagnosis of infection based on their presence in plants without symptoms , and their absence in noninfected corn are consistent with the hypothesis that these unusual filaments are formed by the mycoplasma-like organism presumed to be the corn stunt agent .
C0012634
disease
C0009450
infection