The Effect of Meloidogyne incognita and Tissue Wounding on Severity of Seedling Disease of Cotton Caused by Rhizoctonia solani.

Scans of slash pine wood chips infested with pine wood nematodes showed coiled aggregates of 5-10 nematodes in the axial resin canals, and 1-2 nematodes folded in the radial resin canals. Observations of the pine wood nematode by SEM showed the head to be offset with six labial lohes. A smaller circle nf six inner lobes surrounded the stonta. A single lahial sensillmn was observed on each of the two subventral and two snbdorsal lobes. The two opposite lobes, without sensilla, bore a pore-like amphid. The female vttlva flap was observed to be a pouch. In addition to Iwo pairs of copulatory papillae previously described for the male, three additional papillae were observed: an additional post-anal pair, and a single papilla anterior to the cloaca. Spicules were fused ventrally. Distal spicule ends terminated in two fused half discs. Caudal alae were angular at the tail terminus, but era'led inward at the corners to appear oval. Lateral lields had four lateral striations.