PLANT NEMATODES THE GROWER SHOULD KNOW


-.root


- - type of ann


- .pex


- -. pip


 Figure 20.-Drawing of a female of the citrus nematode, Tylenchulus semipene-
trns Cobb, attached to a root. The elongated head end is shown inserted deep
into the root tissue so that the cells of the axial cylinder are reached. p ex, excretory
pore; type of ann, annulation of cubicle, only partly drawn; vlv, vulva.