DEPARTMENT OF AGRICULTURE


eliminate all stages inside the roots-eggs, larvae, and adults-if the roots
are destroyed. The development of the larvae is interrupted if the root
on which they are feeding is disturbed, and they will perish when the
root dies. In fleshy roots, however, such as peony, and in rhizomes,
corms, tubers, and bulbs development may go on, if these plant parts


 Figure 18.-A. Photomicrograph of a larval specimen of a root-knot nematode
in the tissue of the same potato shown in Figure 17. B. Photomicrograph of an
egg mass of the nematode in the tissue of the same potato as shown in Figure 17.
x 85